mysql NULL value in where in CLAUSE

Question

how to deal with NULL value in mysql where in CLAUSE

i try like

SELECT * FROM mytable WHERE field IN(1,2,3,NULL)
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Answer 1

Maybe this information from the MySQL Reference Manual helps:

To comply with the SQL standard, IN returns NULL not only if the expression on the left hand side is NULL, but also if no match is found in the list and one of the expressions in the list is NULL.