You should never mix quoted and unquoted values in an IN list : IN « Comparison Functions Operators « MySQL Tutorial

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MySQL Tutorial » Comparison Functions Operators » IN

15. 7. 3. You should never mix quoted and unquoted values in an IN list


SELECT val1 FROM tbl1 WHERE val1 IN (1,2,'a');

Instead, write it like this:


SELECT val1 FROM tbl1 WHERE val1 IN ('1','2','a');

15. 7. IN
	15. 7. 1.	expr IN (value,...)
	15. 7. 2.	SELECT 'A' IN ('A','B','C');
	15. 7. 3.	You should never mix quoted and unquoted values in an IN list
	15. 7. 4.	Use IN with data in a table
	15. 7. 5.	Using IN with subquery
	15. 7. 6.	Using more than one column with a NOT IN operator

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