instr(“123,123456,456789”,“123”) => 123,123456
find_in_set(“123,123456,456789”,“123”) = > 123
Q.E.D.
书中人
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instr(“123,123456,456789”,“123”) => 123,123456
find_in_set(“123,123456,456789”,“123”) = > 123
Q.E.D.