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Status Future consideration
Workspace Db2
Components Other/Unknown
Created by Guest
Created on Dec 8, 2021

Please add a built-in function to reverse a string

Currently to reverse a string, we have to create a udf. The syntax for a simple one was easily available on the SQLTips4Db2 blog .... which IBM has removed. I think Db2 on z has this, and some other variants of SQL out there include it. This is the text of that one, not saying it has to be this, but this is one way to do it:

CREATE OR REPLACE FUNCTION REVERSE(INSTR VARCHAR(4000))

RETURNS VARCHAR(4000) SPECIFIC REVERSE

DETERMINISTIC NO EXTERNAL ACTION CONTAINS SQL

RETURN WITH rec(pos, res) AS (VALUES (1, CAST('' AS VARCHAR(4000)))

UNION ALL

SELECT pos + 1, SUBSTR(INSTR, pos , 1) || res

FROM rec

WHERE pos <= LENGTH(INSTR)

AND pos < 5000)

SELECT res FROM rec WHERE pos > LENGTH(INSTR)@

Needed By Yesterday (Let's go already!)