How to split comma separated string into rows
In rare cases we might need to convert string data into rows. So, you can simply do this using the code below. If your string is not comma […]
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Adaptive Cursor Sharing & Histograms
Adaptive cursor sharing has been used in Oracle 11g first. This feature enables a single statement that contains bind variables to use multiple execution plans. According to the […]
More DetailsAnalytic functions & Windowing clause
Analytic functions have been used from the early versions of Oracle. It is used in many tasks, especially reporting. In this article, I am going to use EMP […]
More DetailsSUBSTR vs DBMS_LOB.SUBSTR
We have to choose the right built-in function when developing pl/sql applications. The following test case shows the performance outcome between SUBSTR and DBMS_LOB.SUBSTR functions. This test was […]
More DetailsPivot and Unpivot Operators in Oracle 11g
PIVOT In this article you will learn how to use PIVOT and UNPIVOT operators. Basically, pivot operator allow you to transpose rows into columns. Prior to 11g, it […]
More DetailsORA-22859 invalid modification of columns
When you try to convert datatype CLOB to VARCHAR2, you get the ORA-22859 invalid modification of columns error even if the column is empty. In order to overcome […]
More DetailsParallel Enabled Pipelined Table Functions
In the previous article, I mentioned about pipelined table functions. In this article, I am going to talk about parallel feature of pipelined table functions. At least one […]
More DetailsPipelined Table Functions
Table functions are used in FROM clause of a query as if it were a regular table that return PL/SQL collections. Returning large size of collections can be […]
More DetailsXPath / XQuery / SQL
In brief, I will compare the equivalence of SQL, XQuery and XPATH. The following XML feed is used for this purpose. Oracle 11g is used. Now, I want […]
More DetailsRegular Expression
You can use the following character classes for your regex pattern. Character Class Description [:alnum:] Alphanumeric characters [:alpha:] Alphabetic characters [:blank:] Blank Space Characters [:cntrl:] Control characters (nonprinting) […]
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