kwatog & co.» isnull http://kwatog.com tech notes and general nonsense Tue, 31 Jan 2012 06:27:55 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Oracle NVL Equivalent in MySQL http://kwatog.com/blog/mysql/oracle-nvl-equivalent-in-mysql/ http://kwatog.com/blog/mysql/oracle-nvl-equivalent-in-mysql/#comments Tue, 29 Dec 2009 01:59:44 +0000 kwatog http://kwatog.com/?p=204 Here’s the MySQL equivalent of Oracle’s NVL and MSSQL/Sybase’s ISNULL functions.

Syntax


IFNULL(expr1,expr2)

Usage

If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2. Take note that IFNULL() returns a numeric or string value, depending on the context in which it is used. I haven’t used it for other data types yet but I reckon it would have the same results. That is to return the same data type as that of expr1. Another important thing to remember is that expr1 and expr2 should have the same data type

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