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The Oracle DECODE() function allows you to add the procedural if-then-else logic to the query. In the following example, the Oracle DECODE() function compares the first argument (1) with the second argument (1).
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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.
DECODE compares expr to each search value and returns the corresponding result if a match is found. Learn the syntax, description, examples, and data type conversion of DECODE function.
1 cze 2023 · Learn how to use the Oracle DECODE function to perform an IF-THEN-ELSE comparison. See the syntax, parameters, differences with CASE, and examples of using DECODE in various scenarios.
6 sie 2024 · This tutorial provides a comprehensive guide to using the SQL DECODE() function in Oracle. I will also compare DECODE() to CASE WHEN in Oracle and help you understand when to use each function. Finally, I will provide code for the equivalent transformations in SQL Server, PostgreSQL, and MySQL.
Purpose. DECODE compares expr to each search value one by one. If expr is equal to a search, then Oracle Database returns the corresponding result. If no match is found, then Oracle returns default. If default is omitted, then Oracle returns null.
26 gru 2011 · decode( decode( decode( dummy, 'X', 'A', 'B' ), 'A', 'M', 'N' ), 'M', 'nested!', 'N' ) decode is like case decode( dummy, 'x', 'a', 'b' ) is like: case when dummy = 'x' then 'a' else 'b' end; so, we first evaluate that and we either get 'a' or 'b', the the decode becomes: decode( 'either A or B', 'A', 'M', 'N' )
