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with cteSource AS ( SELECT 'abc123455' as col1 UNION ALL SELECT 'abd3454565' union all SELECT 'abc1234g' UNION ALL SELECT 'asc12345h' ) ,cteSourcePlus AS (SELECT col1 , CASE WHEN RIGHT(col1,1) LIKE '[a-zA-Z]' THEN 1 ELSE 0 END AS isAlpha , CASE WHEN RIGHT(col1,1) LIKE '[a-zA-Z]' THEN RIGHT(col1,1) ELSE '' END AS lastAlpha FROM cteSource) SELECT LEFT(col1,3) + RIGHT('000000000' + SUBSTRING(col1,4,LEN(col1) - (3+isAlpha)) ,12-3) /* for numeric part*/ + lastAlpha /* for alphabetic part*/ AS newCol2 FROM cteSourcePlus AS S
newCol2
abc000123455
abd003454565
abc000001234g
asc000012345h