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DECLARE @STR VARCHAR(20);
SET @STR = '2479_2480_2482';
SELECT
CHAR_LENGTH(@STR) - CHAR_LENGTH(REPLACE(@STR,'_',''))
,SUBSTRING_INDEX(@STR," ",(CHAR_LENGTH(@STR) - CHAR_LENGTH(REPLACE(@STR,'_',''))));
결과값: 2 , 2479_2480
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