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FOR UPDATE vs FOR UPDATE SKIP LOCKED

Posted on 31/01/202302/02/2023 by admin

In this post, I am going to explain how FOR UPDATE and FOR UPDATE SKIP LOCKED clauses work. I would like to demonstrate it with a basic example. […]

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NVL vs COALESCE

Posted on 28/10/202228/10/2022 by admin

As it is known, NVL and COALESCE functions are used in order to eliminate NULL values. However, NVL function is much more popular in comparison with the COALESCE. […]

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How to use MULTISET UNION DISTINCT on collections

Posted on 25/04/202227/04/2022 by admin

Let’s start with a basic example. Suppose, you have two PL/SQL collections with the same data type that you want to merge and remove the repetitive data. You […]

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How to use PL/SQL functions within SQL

Posted on 08/03/202222/03/2022 by admin

As it is known, invoking PL/SQL code from SQL cause context switching. SQL is a non-procedural language and it is very different from PL/SQL language. In addition, PL/SQL […]

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The power of MATCH_RECOGNIZE

Posted on 24/02/202224/02/2022 by admin

MATCH_RECOGNIZE is one of the most powerful feature of SQL. There are several use cases, such as finding series of consecutive rows, pattern matching, etc. Once you understand […]

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LISTAGG Enhancements

Posted on 31/01/202210/02/2022 by admin

If you consider to aggregate data from multiple rows into a single column, LISTAGG might be the first function that comes to your mind. It has been enhanced […]

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WITH clause and Depth First Search

Posted on 27/01/202227/01/2022 by admin

In this article, I am going to explain how you can implement the depth first search with using the WITH clause or also known as subquery factoring clause. […]

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How to reorder columns of table

Posted on 23/01/202227/01/2022 by admin

If you want to change the order of the columns of any table without recreating it, then the following trick will work for you. Suppose you want to […]

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How to make your PL/SQL code faster

Posted on 27/12/202101/02/2023 by admin

In this post, some important points of PL/SQL performance metrics has been explained. Oracle 19c has been used in all examples. Use Bind Variable Using bind variables can […]

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PL/SQL Exception Handling in All Details

Posted on 15/12/202129/08/2022 by admin

Exception management is one of the most important part of all programming languages. Having a good understanding of this topic will help you a lot in debugging. In […]

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  • FOR UPDATE vs FOR UPDATE SKIP LOCKED
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  • How to use MULTISET UNION DISTINCT on collections
  • How to use PL/SQL functions within SQL
  • The power of MATCH_RECOGNIZE

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