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Oracle NULLIF function

Oracle/PLSQL NULLIF function compares expr1 and expr2. If expr1 and expr2 are equal, the function NULLIF returns NULL. Otherwise, it returns expr1….

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Oracle NVL function

Oracle/PLSQL NVL function allows you to replace the value when there is a Null value….

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It does matter what the column order is in PostgreSQL.

Recently, I came across some really broad tables with hundreds of columns in a database that was not particularly well organized. Our PostgreSQL suppo…

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Oracle SQLCODE function

The SQLCODE function returns the error number associated with an exceptional situation. This function can only be used in the exception handling secti…

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Oracle NVL2 function

Oracle/PLSQL NVL2 function extends the functionality of the NVL function. It replaces the value when a Null value is encountered and also when a non-N…

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