Code :
SELECT UnString, NouveauString = CASE WHEN charindex('HFR', UnString) > 0 THEN substring(UnString,0,charindex('HFR', UnString)) WHEN charindex('SQL', UnString) > 0 THEN substring(UnString,0,charindex('SQL', UnString)) ELSE 'Neither' END FROM blabla WHERE blabla2
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