This script converts a numeric column index to an Excel column name (ex: AC). The script doesn't use cursors or any other iteration. It converts the value using only set-based code so it is very suitable for using within a function.
The @ColumnIndex parameter is 1-based (1 = column A)
DECLARE @ColumnIndex INT = 53 ; WITH N26 AS ( SELECTTOP 26 N = ROW_NUMBER() OVER(ORDER BY (SELECT 1)) FROM master.sys.columns A ) SELECT CASE WHEN N1.N = 1 THEN N'' ELSE NCHAR(UNICODE(N'A') + N1.N - 2) END + NCHAR(UNICODE(N'A') + N2.N - 1) FROM N26 N1 CROSS JOIN N26 N2 WHERE@ColumnIndex = ((N1.N - 1) * 26) + N2.N ORDERBY N1.N, N2.N
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