Recursive SQL – Database Research & Development https://www.dbrnd.com BIGData | NoSQL | MSSQL | MySQL | PostgreSQL Mon, 05 Mar 2018 19:33:58 +0000 en-US hourly 1 https://wordpress.org/?v=7.0.4 SQL Puzzle: SQL Advance Query – Using Recursive CTE, Generates the Columns https://www.dbrnd.com/2018/02/sql-puzzle-using-recursive-cte-generates-the-columns/ Sun, 18 Feb 2018 16:16:48 +0000 https://www.dbrnd.com/?p=7106

Check the below input data and expected output for generating new columns using Recursive CTE.

Input Data:

a1          a2          a3          a4          a5          a6
----------- ----------- ----------- ----------- ----------- -----------
1           2           3           4           5           6

Expected Output:

a1          a2          a3          a4          a5          a6          b1          b2          b3          b4          b5          b6
------ ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- -----------
1           2           3           4           5           6           2           4           6           8           10          12

Solution:

WITH
  col1(a1, a2, a3, a4, a5, a6) AS (SELECT 1,2,3,4,5,6),
  col2(b1, b2, b3, b4, b5, b6) AS 
  (
    SELECT 
		a1 * 2
		,a2 * 2
		,a3 * 2
		,a4 * 2
		,a5 * 2
		,a6 * 2
    FROM col1
  )
SELECT *
FROM col1, col2

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