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This tutorial shows you how to use the Oracle DECODE() function to add the procedural if-then-else logic to SQL queries.
- Oracle COALESCE Function
However, the following example uses arguments of different...
- Oracle COALESCE Function
1 cze 2023 · The purpose of the Oracle DECODE function is to perform an IF-THEN-ELSE function. It’s similar to a CASE statement, but CASE is a statement where DECODE is a function. It allows you to provide a value, and then evaluate other values against it and show different results.
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.
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.
Example: SELECT name, DECODE ( student_id, 1, 'Tom', 2, 'Mike', 3, 'Harry', 'Jim') result. FROM students; Explanation: Here, each student_id value will be compared one by one by the DEFAULT function. The default value ( ‘Jim’ ) will be returned if no matches are found.
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.
