Search results “Hint oracle view”
Oracle 11g Hints Overview
In this Video tutorial we will discuss about Optimizer hints in Oracle. What is optimizer hint, when & why its needed. Different Category of hints. Description of mostly used hints. Demonstrate how query plan can change with the influence of hint.
Views: 49454 Anindya Das
Oracle Hints Tutorial for improving performance
Oracle Hints Tutorial for improving performance APPEND PARALLEL JOIN INDEX NO_INDEX SELECT /*+ FIRST_ROWS(10) */ * FROM emp WHERE deptno = 10; SELECT /*+ ALL_ROWS */ * FROM emp WHERE deptno = 10; SELECT /*+ NO_INDEX(emp emp_dept_idx) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; SELECT /*+ INDEX(e,emp_dept_idx) */ * FROM emp e WHERE e.deptno = 10; -- SELECT /*+ INDEX(scott.emp,emp_dept_idx) */ * FROM scott.emp; SELECT /*+ AND_EQUAL(e,emp_dept_idx) */ * FROM emp e; SELECT /*+ INDEX_JOIN(e,emp_dept_idx) */ * FROM emp e; SELECT /*+ PARALLEL_INDEX(e,emp_dept_idx , 8) */ * FROM emp e; SELECT /*+ LEADING (dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; SELECT /*+ PARALLEL(8) CACHE (e) FULL (e) */ * FROM emp e ; SELECT /*+ PARALLEL FULL (e) */ * FROM emp e ; SELECT /*+ PARALLEL USE_MERGE (emp dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; -- SORT Merge Join SELECT /*+ PARALLEL USE_HASH (emp dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; -- Hash Join SELECT /*+ PARALLEL */ * FROM emp e ; INSERT /*+ APPEND */ INTO mytmp select /*+ CACHE (e) */ *from emp e; commit;
Views: 2780 TechLake
SQL: Inline Views
In this Tutorial, you'll learn the advantages of inline view and how to make use of it..
Views: 16908 radhikaravikumar
This video explains about views in Oracle SQL, views are integral part of any database, and its important to clearly understand views to work with them. Views are named and stored sql statements which would be executed once we call the view, views in whole do not store the data except if its a Materialized view. Views are widely used in day to day programming and can be useful in various cases, we discussed about all those cases in this video. If you would like to learn more on materialized view, visit the below videos https://youtu.be/7PklhTCNxxw https://youtu.be/EDf8Pk-x_nA If you want to know the difference between views and Materialized view, visit https://youtu.be/BnNKws_7_jc Visit our blog at www.oracleplsqlblog.com All out youtube videos: www.youtube.com/c/kishanmashru
Views: 974 Kishan Mashru
ORACLE WORLD - Materialized view Part #1st
Hello friends in this video i'm giving you Introduction of Materialized view, why we use it and what is the advantage of MV. Oracle database Unbeatable,Unbreakable Platform.. By Lalit saini
Views: 6979 Oracle World
How to create a View in Oracle Database with SQL.
This is a online training video o oracle tutorial on how to create a view in Oracle. How it is stored in database. Just not mentioned one thing that how to view the view. Just type desc view name.
Views: 4906 Subhroneel Ganguly
What is a Materialized View?
http://zerotoprotraining.com This video explains the concept of a materialized view in a database also known as materialized query table an indexed view. Category: Databases Tags: Materialized View
Views: 99892 HandsonERP
Why Use Parallel Processing?
This video compares the use of parallel and serial processing for the same SQL query. Copyright © 2012 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the "Materials"). The Materials are provided "as is" without any warranty of any kind, either express or implied, including without limitation warranties of merchantability, fitness for a particular purpose, and non-infringement.
SQL tutorial 51: DECODE function in Oracle Database By Manish Sharma (RebellionRider)
SQL Tutorial 51 Decode function in Oracle Database. ● What Is DECODE() ● DECODE ( ) vs CASE ● Syntax of DECODE() ● Query 1. String Matching using DECODE() ● Query 2. DECODE() comparing values form the COLUMN of the table Celebrating 1000 subscribers. Thanks a lot guys for all your love and support. ------------------------------------------------------------------------ ►►►LINKS◄◄◄ Blog: ------------------------------------------------------------------------- Copy Cloud referral link || Use this link to join copy cloud and get 20GB of free storage https://copy.com?r=kb4rc1 -------------------------------------------------------------------------- ►Make sure you SUBSCRIBE and be the first one to see my videos! -------------------------------------------------------------------------- Amazon Wishlist: http://bit.ly/wishlist-amazon ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ►►►Find me on Social Media◄◄◄ Follow What I am up to as it happens on https://twitter.com/rebellionrider https://www.facebook.com/imthebhardwaj http://instagram.com/rebellionrider https://plus.google.com/+Rebellionrider http://in.linkedin.com/in/mannbhardwaj/ http://rebellionrider.tumblr.com/ http://www.pinterest.com/rebellionrider/ You can also Email me at [email protected] Please please LIKE and SHARE my videos it makes me happy. Thanks for liking, commenting, sharing and watching more of our videos This is Manish from RebellionRider.com ♥ I LOVE ALL MY VIEWERS AND SUBSCRIBERS
Views: 30238 Manish Sharma
What is a PARTITION in Oracle? Why to use Partition And Types of Partitions
Hi guys in my today scenario I'm going to explain with you What is a PARTITION in Oracle? Why to use Partition And Types of Partitions Oracle database Unbeatable,Unbreakable Platform..
Views: 20081 Oracle World
Finding Performance Tuning In Oracle
http://www.perftuning.com - If you need performance tuning in Oracle, you need to find reliable service providers to work with. There are several Oracle performance tuning services these days and all of them provide reliable Oracle database tuning you need. However, before you agree to get Oracle performance tuning ppt presentations, consider whether or not the service providers are recommended by previous clients.
Views: 28 Francesca Lytle
Static SQL Hint
How to set a Hint for Static DB2 SQL.
Creating an Index in Oracle SQL
This video shows how to Create an index in Oracle SQL . Try to share these videos for poor students and subscribe this channel for more upcoming other technical videos.
Views: 27 Technology mart
flashback in Oracle   2
Views: 67 rajani easo
20 Essential Oracle SQL and PL/SQL Tuning Tips
SQL and PL/SQL are powerful languages used to access an Oracle database. Today's databases contain mountains of data which presents itself as a challenge when trying to get to the data we want to in a timely fashion. In this FREE Webinar, OCP DBA John Mullins will present 20 valuable tips to help your SQL or PL/SQL perform better. The tips cover every angle regarding SQL and PL/SQL performance, making the presentation suitable for all job roles. Demonstrations will be used to support many of the tips and Oracle 11g and 12c will be covered.
Views: 33247 Themis Education
Oracle PlSql Performance Tuning
In this video we will discuss about performance point of view in Oracle PlSql. How we can improve the performance by using small tips. For more information please visit https://www.koenig-solutions.com/oracle-training-certification-courses.aspx
Views: 32 Koenig Solutions
SQL: Explain Plan for knowing the Query performance
In this tutorial, you'll learn how to compare queries to know the better performance query..
Views: 88098 radhikaravikumar
Finding Database Columns By Name in Oracle SQL Developer
How to find all columns in your Oracle Database by searching on the name.
Views: 4444 Jeff Smith
Oracle Database Hints Tuning Tips Presentation Video Oracle DB
For a quick reference on oracle visit http://PocketORACLE.blogspot.com
Views: 4976 TheEzguide
Oracle Indexes - Live Demonstration
When is a Full Table Scan faster than an Index Scan? Watch Ross and Jordan act out an Oracle database reading and caching data via both methods, explaining the costs and benefits in simple and easy to understand terms. The demonstration is part of a talk by Ross Leishman of DWS Ltd on the principles of Understanding Indexes for SQL Tuning. The full lecture is at this link: https://www.youtube.com/watch?v=Z4hKomnGHFA DWS Ltd is a leading publicly listed Australian IT Services company, providing services to blue chip organisations since 1991. With a business philosophy based upon integrity, reliability and professional service delivery, DWS provides end to end IT solutions. www.dws.com.au
Views: 2605 DWS Ltd
Efficient Function Calls From SQL (Part 2) : The DETERMINISTIC Hint
The second part of a mini-series of videos showing how you can improve the performance of function calls from SQL. In this episode, we take a look at the DETERMINISTIC hint. For more information see: https://oracle-base.com/articles/misc/efficient-function-calls-from-sql#deterministic-hint Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Dana Singleterry : Blog: https://blogs.oracle.com/dana/ Twitter: https://twitter.com/dsingleterry Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 2055 ORACLE-BASE.com
Oracle SQL Join Tutorials
Oracle SQL Join Tutorials. Different types of joins and examples. For Full Course Experience Please Go To http://mentorsnet.org/course_preview?course_id=4 Full Course Experience Includes 1. Access to course videos and exercises 2. View & manage your progress/pace 3. In-class projects and code reviews 4. Personal guidance from your Mentors
Views: 100550 Oresoft LWC
IN VS EXISTS VS JOIN, performance
This video demonstrates the performance effects of using an exists clause instead of an IN clause, also it shows how we can update a simple sub query having an IN clause with an EXISTS or JOIN statement. It also shows that joining would consider the null data, where as an IN clause would neglect null values. If you want more such videos of exciting and amazing 'difference between' concepts, check out the links below : union and union all : https://youtu.be/n9FqQOd8liY char and varchar2 : https://youtu.be/039qzwjWf4k replace and translate : https://youtu.be/HKYF77BGzOE procedure and function : https://youtu.be/q3LmOenL120 rank and dense_rank : https://youtu.be/WGSX998hZ9M delete and truncate : https://youtu.be/u76wMm2byXo %type and %rowtype : https://youtu.be/MlLUFeZ_3eM
Views: 9611 Kishan Mashru
[Oracle SQL Performance Tuning: 4/4] Basic Hints and their Usage
This presentation explains how to use basic hints of Oracle. The series of SQL tuning videos presents performance tuning tips for developers
Views: 9606 anilkumar ghorakavi
introduction video to oracle sql and db
oracle: this video is about the introduction to topics which am going to discuss in my channel. About introduction to dbms, using sql queries, ddl. drl, dcl, tcl in oracle sql 11g and topics which am covering in oracle database 12c. topics are oracle database architecture, intialization parameter, control files, redologs, backup and recover, dataguard. this video include: oracle tutorial for beginners,oracle daphne,oracle database,oracle sql developer tutorial for beginners,oracle dba training videos,oracle 12c,oracle cloud,oracle of seasons,oracle apex,oracle of ages,oracle adf,oracle asm,oracle apps,oracle architecture,oracle apex tutorial for beginners,oracle application express,oracle at delphi,oracle arena loud,oracle analytical functions,oracle business intelligence,oracle bi,oracle bangla tutorial,oracle big data,oracle bpm,oracle business intelligence tutorial,oracle bones ancient china,oracle bangla,oracle bi publisher,oracle big data discovery,oracle cc&b,oracle cards,oracle card reading,oracle crm,oracle cloud erp,oracle certification,oracle cpq,oracle create table,oracle corporation,oracle coherence,oracle 12c installation,c programdata oracle java javapath java.exe,oracle c,oracle database tutorial for beginners,oracle dota 2,oracle data integrator,oracle dba interview questions and answers for experienced,oracle database administration tutorial,oracle database architecture,oracle data guard,oracle d,installation d'oracle 11g,cours d'oracle,oracle erp,oracle ebs,oracle enterprise manager,oracle exadata,oracle ebs tutorial for beginners,oracle enterprise manager 11g tutorial,oracle enterprise manager 12c,oracle erp cloud,oracle eloqua,oracle explain plan,oracle e-business suite,oracle e business tax,oracle financial e-business r12,oracle e commerce,oracle e-business,installing oracle e-business suite,e talent oracle,oracle fusion,oracle forms,oracle financials,oracle forms and reports tutorial,oracle fusion financials,oracle for beginners,oracle fusion hcm,oracle finance tutorial for beginners,oracle financials training,oracle forms 12c,oracle golden gate,oracle golden gate tutorials,oracle general ledger,oracle grc,oracle gaming,oracle general ledger tutorial,oracle golden gate architecture,oracle golden gate installation,oracle genesis,oracle gameplay,oracle 11g,oracle 10g,oracle 11g architecture,oracle hyperion,oracle headlights,oracle hcm cloud,oracle hyperion tutorial for beginners,oracle hrms,oracle halo lights,oracle halo install,oracle hrms tutorial for beginners,oracle halo colorshift,oracle hints,oracle installation,oracle identity manager tutorial,oracle index,oracle integration cloud service,oracle installation on windows 10,oracle identity manager,oracle inventory management,oracle installation on linux,oracle interview,oracle identity and access management hands on demo,oracle java,oracle joins,oracle jd edwards,oracle java certification tutorial,oracle joins tutorial,oracle java tutorial,oracle jd edwards enterpriseone tutorial,oracle java cloud service,oracle jdbc connection in eclipse,oracle java mission control tutorial,oracle krul,oracle knowledge management,oracle kraken,oracle kari,oracle key vault,oracle killer queen,oracle khmer,oracle knowledge,oracle kraken evolve,oracle knight ark,k online oracle apps,k-onlines.com oracle applications,k-online oracle,oracle linux,oracle learning library,oracle led headlights,oracle linux 7, oracle led illuminated wheel rings,oracle linux 7 installation on virtualbox,oracle linux tutorial for beginners, oracle learning,oracle lighting® - led headlight conversion kit,oracle label security,l oracle trailer,l'oracle film complet, l'oracle (the physician),l'oracle film complet en francais,l'oracle trailer vf,l'oracle vf,l'oracle nctk,l'oracle vision 1,l'oracle 2013,l'oracle film complet vf,oracle marketing cloud,oracle management cloud,oracle mdm,oracle music,oracle micros,oracle maf,oracle materialized view,oracle middleware,oracle mobile application framework,oracle mft,project m oracle,oracle naomi kyle,oracle nigerian movie,oracle neo,oracle net configuration assistant,oracle net manager,oracle nigerian movie full,oracle net configuration assistant 11g,oracle nosql database,oracle nosql tutorial,oracle normalization,oracle of seasons ost,oracle of delphi,oracle of seasons speedrun,oracle of ages speedrun,oracle order management,oracle of seasons walkthrough,oracle of ages music,oracle of seasons review,sunn o))) oracle,como instalar o oracle,como baixar o oracle,como usar o oracle,o que é oracle,oracle performance tuning,oracle pl/sql,oracle pl sql tutorial,oracle performance tuning 11g,oracle partitioning,oracle pl/sql tutorial for beginners,oracle peoplesoft,oracle primavera,oracle policy automation,oracle pl sql tutorial for beginners,oracle query,oracle query performance tuning,oracle quality,oracle query optimization,oracle quality module, oracle queue
Views: 501 manivas medishetty
This Tutorial will explain basics of Oracle 11g EXPLAIN Plan by using this ppt & some hands-on in Oracle 11g R2 Database.This tutorial will include below topics. Understanding EXPLAIN plan. Set up & Use EXPLAIN Plan. Explain PLAN_TABLE & related scripts & DBMS_XPLAN.DISPLAY. Generate & View EXPLAIN Plan. Read & Interpret basics of EXPLAIN Plan. EXPLAIN PLAN limitations.
Views: 155204 Anindya Das
Hints and Tips - Synthesizing rows inside Oracle
You've already got a gazillion rows inside your Oracle Database table. So why would you want to generate even more rows ? Well, it’s a common need as you'll see in this quick tip, which more to the point shows you how to do it easily and efficiently with SQL ====================================================== Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Views: 1737 Connor McDonald
part 1 materalized view
data warehousing, materialized view, oracle 10g https://www.oercommons.org/authoring/21861-data-warehouse-design-using-oracle/4/view
Views: 10523 Dr. Girija Narasimhan
Querying some V dollar views
#Oracle #V$Views Querying V$ performance views
Views: 822 Hemant K Chitale
eXtrem Parallel Processing for Oracle
eXtrem Parallel Processing for Oracle
Views: 169 Petr Jezek
Process to check alert log in oracle
Here is a simple procedure by which you can checkout aleart log . regards, Pushpak Pattewar
Views: 9272 Pushpak Pattewar
Local Vs Global Partitioned Index in Oracle 11g
The Video Explains the difference between Local Partitioned Indexes(Prefixed vs Non Prefixed Indexes). and Global Partitioned Index along with the challenges in maintaining Global partitioned Indexes when the underlying tables partitioned is dropped/truncated/Merged/Moved. Local Partitioned Index Shares the same boundaries as the table and are in the same number as table partitions they are widely used in DSS and DWH systems. While Global Partitioned Index are predominantly used in OLTP systems
Views: 2845 Tech Coach
JSON in the Oracle Database: Auto-Generate Views and Virtual Columns
In part 2 of the JSON Dataguide series, Beda Hammerschmdt, consulting member of technical staff at Oracle, outlines how to auto-genrate views and virtual columns from JSON data. https://developer.oracle.com/ https://cloud.oracle.com/en_US/tryit
Views: 241 Oracle Developers
How to Install Oracle SQL Developer
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Views: 91 T3SO Tutorials
Multiple Indexes on the Same Set of Columns
This video demonstrates how you can use invisible indexes to allow multiple indexes on the same set of columns. Multiple indexes on the same column set is a new feature in Oracle 12c. For more information see: https://oracle-base.com/articles/12c/multiple-indexes-on-same-set-of-columns-12cr1 Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Scott Spendolini Blog: http://spendolini.blogspot.co.uk/ Twitter: https://twitter.com/sspendol Website: http://www.sumnertech.com/ Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 1110 ORACLE-BASE.com
40. SQL Buffer Commands in Oracle
In this video you will learn about SQL Buffer Commands in Oracle. Unlike other programming language Oracle also uses functions to perform common operations. For Support =========== Email: [email protected] Contact Form: http://www.learninhindi.com/home/contact Our Social Media ================ Facebook: https://www.facebook.com/LearnInHindi Twitter: https://twitter.com/LearnInHindi For Training & Videos ===================== For more videos and articles visit: http://www.learninhindi.com Free Java Programming In Hindi Course ===================================== https://www.youtube.com/playlist?list=PLOZ3jentlCDAwwhMyoLISrxkXTADGp7PH Free Oracle PL/SQL Programming In Hindi Course ============================================== https://www.youtube.com/playlist?list=PLB5DA82419C2D99B6 Free C Programming In Hindi Course ================================== https://www.youtube.com/playlist?list=PLOZ3jentlCDAxKpBLMWogxSdy6BZcsAJq Trips & Tricks Channel ====================== https://www.youtube.com/channel/UCGmLfkuCo-3lHHJXRJ9HUMw Programming in Hindi Channel ============================ https://www.youtube.com/channel/UCudElIDgwNrybeAvXIy1HZQ
Views: 13455 ITORIAN
How Reverse Key B*Tree Index Helps in Certain Cases
When to use Reverse B * Tree Index For Full Course Experience Please Go To http://mentorsnet.org/course_preview?course_id=6 Full Course Experience Includes 1. Access to course videos and exercises 2. View & manage your progress/pace 3. In-class projects and code reviews 4. Personal guidance from your Mentors
Views: 10305 Oresoft LWC
SQL: Global Temporary Table (GTT) Part-2
In this tutorial , you'll learn about GTT...
Views: 15389 radhikaravikumar
Create Login Window With User Authentication in C# step by step
This video teach how to create login window in c#, You will learn about user authentication, Login form will check if user while admin or client after every form act as admin or client mode.. it will very use for beginner to learn c sharp in step by step
Views: 457636 Vetrivel D
SQL Hints, Tips, Tricks, and Tuning
What is the difference between inner, outer, cross and natural join? What is a correlated subselect? What is the advantage and what the disadvantage of an index. Is NOT and OR evil? When do I need normalisation and when denormalisation? All this questions and lots of other performance tips and tricks on SQL level will be given in the talk.
Views: 14547 Andrea Ross
Hints and Tips - DML error logging - make your SQL loads more productive
There is nothing worse than spending hours trying to load data into a table, only to have that load fail and you end up with nothing to show for your efforts. DML error logging will solve that problem for you. This quick tip shows you how easy it is ====================================================== Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Views: 1920 Connor McDonald
Tune Query without Changing Code using DBMS_ADVANCED_REWRITE
Tune Query without modifying SQL using DBMS ADVANCED REWRITE
Views: 9164 Anindya Das
B*Tree Index Types (Indexes in Oracle-2)
This video will cover different types of B-tree indexes: Descending index,Reverse key index,Key Compressed Index B-tree cluster index,Index Organized Table(IOT):
Views: 15078 Anindya Das
Hints and tips for 18c documentation
blog: https://connor-mcdonald.com Quick tips to using the Oracle Database 18c documentation Download the full zip here https://docs.oracle.com/en/database/oracle/oracle-database/18/zip/oracle-database_18.zip
Views: 381 Connor McDonald
Efficient Function Calls From SQL (Part 1) : Scalar Subquery Caching
The first part of a mini-series of videos showing how you can improve the performance of function calls from SQL. In this episode, we take a look at Scalar Subquery Caching. For more information see: https://oracle-base.com/articles/misc/efficient-function-calls-from-sql#scalar-subquery-caching Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Bruno Borges : Blog: https://blogs.oracle.com/brunoborges/ Website: http://brunoborges.com/ Twitter: https://twitter.com/brunoborges Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 2131 ORACLE-BASE.com
Efficient Function Calls From SQL (Part 6) : Function-Based Indexes
The sixth part of a mini-series of videos showing how you can improve the performance of function calls from SQL. In this episode, we look at using function-based indexes to improve the performance of queries that use function calls in the WHERE clause. For more information see: https://oracle-base.com/articles/8i/function-based-indexes https://oracle-base.com/articles/misc/efficient-function-calls-from-sql#functions-in-the-where-clause Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Ronald Bradford : Blog: http://ronaldbradford.com/blog/ Twitter: https://twitter.com/RonaldBradford Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 1335 ORACLE-BASE.com
Oracle Database Indexes: Myths, Tips and Tricks
In this tutorial, OCM John Watson will - via demonstrations - debunk these myths: Myth #1: Oracle Database does not index NULL Myth #2: A search that includes wildcards can't use an index if the wildcard precedes the string. Myth #3: Oracle will not use a function-based index unless the FBI is coded in the predicate. Myth #4: Indexes always help. The more indexes the better. See http://skillbuilders.com/free-oracle-tutorials for gigabytes of free Oracle video tutorials.
Views: 15865 SkillBuilders
Oracle Hints and Tips - How to get a database installed for home exploring
blog: https://connor-mcdonald.com Brand new to Oracle ... and want to get a basic installation up and running on your Windows laptop, with SQL Developer to access the database ?.... .... Here you go :-)
Views: 929 Connor McDonald
Oracle || Indexes Part-3 by dinesh
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Best Way to Write Basic SQL Queries
SQL Server Query writing strategies is something I have yet to find in any book. When enthusiastic SQL students do this, they experience a revelation. The number of errors drops significantly and the speed at writing complex queries increases immediately. Knowing how to narrow down what we are looking for amongst a vast list of choices helps immensely. Grabbing the right tables first and then the fields second is akin to grabbing the right menu before ordering an item from it. In fact, one student named Tim took this back to his team of SQL developers and they immediately implemented this process. We are all used to following steps. Most of the time, actions are sequential from top to bottom or left to right. Other times we complete things in phases. The two phases we are going to use in this exercise apply to joining tables. This is easy to implement as we only need remember to organize first and clean up second. When visiting a new restaurant, we will ask to see the menu, because we want to see all they have to offer. The odds are that we might be interested in half of the items, but only need a few dishes for our group at the table. Looking at the menu is like starting a query with a ‘SELECT *’ statement. Once we have looked at all the fields, we narrow our choice(s) to only the items we want at the time. Sometimes restaurants have multiple menus. My favorite restaurant has a kids’ menu, an adult menu, a gluten-free menu and a drink menu. These menus were each gathered at our table. Ultimately, in my head, a selection was narrowed to what was needed. Phase I: Organize. When building a new query from many tables, we often find ourselves wondering, “Where do I start?” First, lay the steps out by identifying which tables contain the essential data. Second, get all the table joins working with a basic ‘SELECT *’ statement. Third, add any basic filtering criteria. Phase II: Itemize. Once all joins and criteria, such as SELECT, FROM and WHERE are working, we are ready for Phase II. This entails going back and changing our ‘SELECT *’ to an itemized SELECT field list as the final step. Let’s explore how this two-phase process of Organize and then Itemize can be a big time-saver. We are going to use one of the challenges from the last lab. In Lab 3.2 (Outer Joins), Skill Check 2, we needed to get four fields from two different tables. If we were to list all four desired fields and test one table at time, we will get an error as seen on the right side of the figure below. In the figure below we write a SELECT statement and part of the FROM clause. When completed, the FROM clause will have two tables, but for now we just want to get the Location table working. By using the ‘SELECT *’ strategy, we remove any possible errors from line 1. From there, we can focus on the more complicated logic used for joining tables together. We can add tables one at a time until everything is working. This is the Organize phase. NOTE: SELECT * never results in an Error message stating “invalid column name”, however; a SELECT list with itemized field(s) can have this error. After our query is organized and working, we can go back and itemize the SELECT field list to display only the fields that are necessary. This is done during Phase II (Itemize). The steps for this system are broken down as follows: Since SELECT is always the first statement in a query, it’s natural to want to write the field names before writing the FROM clause. However; we can save time and trouble by using the ‘*’ until the entire query is working properly. When this is complete, it is very easy to itemize the field list, with the confidence of knowing it will not cause any problems. Exercise: Simple membership for a club: Table1 (id_Member,name_Member, email_member, title, age, company) Table2 (id_Club,club_name, club_Location, address) Table3 (id_club, id_member,membership_date) Q1: Show all member names, email, age, and company from Table1 Q2: Show all club name, location, and address data Q3: Show member name, club name, club location (hint: Use joins and all 3 tables) You can find all other classes related to this video here: http://www.joes2pros.com/joes2pros/Course/Introduction_To_Microsoft_SQL_Server Enroll Today & Get the First Month for only $1! Use code: YOUTUBE1
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