Comments on: SQL Puzzle: SQL Advance Query – To Swap the values in the Table

By: karthick

karthick — Wed, 26 Feb 2020 18:05:12 +0000

SELECT
CASE
WHEN col = ‘M’ THEN ‘N’
WHEN col = ‘N’ THEN ‘M’
END as anyname
FROM swapcolumndata

By: Sarfaraz Mohammed

Sarfaraz Mohammed — Mon, 23 Dec 2019 11:57:50 +0000

DECLARE @SwapColumnData TABLE(Col CHAR(1))

INSERT INTO @SwapColumnData(Col)
VALUES(‘M’), (‘N’), (‘N’), (‘M’), (‘N’), (‘N’);

WITH CTE_Data1
AS (SELECT DISTINCT
scd.Col,
DENSE_RANK() OVER(
ORDER BY scd.Col) AS Rnk
FROM @SwapColumnData scd)
SELECT S.Col,
scd1.Col
FROM @SwapColumnData AS S
INNER JOIN CTE_Data1 scd ON S.Col = scd.Col
INNER JOIN CTE_Data1 scd1 ON scd.Rnk scd1.Rnk

By: Esha

Esha — Sat, 02 Nov 2019 16:31:02 +0000

Very nice puzzles

By: Jerry

Jerry — Sat, 04 May 2019 11:21:31 +0000

SELECT CASE
WHEN Col=’M’
THEN ‘N’
ELSE ‘M’
END
FROM SwapColumnData