Web Reference: This tutorial shows you how to use the Oracle DECODE () function to add the procedural if-then-else logic to SQL queries. In a DECODE function, Oracle considers two nulls to be equivalent. If expr is null, then Oracle returns the result of the first search that is also null. The maximum number of components in the DECODE function, including expr, searches, results, and default, is 255. This Oracle tutorial explains how to use the Oracle / PLSQL DECODE function with syntax and examples. The Oracle / PLSQL DECODE function has the functionality of an IF-THEN-ELSE statement.
YouTube Excerpt: SQL Tutorial 51
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