NVL vs COALESCE
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. […]
More DetailsHow to use MULTISET UNION DISTINCT on collections
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 […]
More DetailsHow to use PL/SQL functions within SQL
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 […]
More DetailsThe power of MATCH_RECOGNIZE
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 […]
More DetailsLISTAGG Enhancements
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 […]
More DetailsWITH clause and Depth First Search
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. […]
More DetailsHow to reorder columns of table
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 […]
More DetailsHow to make your PL/SQL code faster
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 […]
More DetailsPL/SQL Exception Handling in All Details
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 […]
More DetailsHow to get OS environment variables in PL/SQL
If you need to find out the value of any OS environment variable, such as ORACLE_HOME, without connecting your remote server. You can use DBMS_SYSTEM.GET_ENV procedure as shown […]
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