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CREATE TABLE myset (col SET('a', 'b', 'c', 'd'));
INSERT INTO myset (col) VALUES ('a,d'), ('d,a'), ('a,d,a'), ('a,d,d'), ('d,c,d');
SELECT col FROM myset;
SELECT * FROM myset WHERE col & 3;
SELECT * FROM myset WHERE FIND_IN_SET('c',col);
SELECT * FROM myset WHERE col LIKE '%c%';
SELECT * FROM myset WHERE col ='a,d';
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