SELECT * FROM tbl WHERE col_1 LIKE '%'+col_2+'%'
EDIT:Voor MySQL zou de equivalente syntaxis zijn:
SELECT * FROM tbl WHERE col_1 LIKE CONCAT('%',col_2,'%')
SELECT * FROM tbl WHERE col_1 LIKE '%'+col_2+'%'
EDIT:Voor MySQL zou de equivalente syntaxis zijn:
SELECT * FROM tbl WHERE col_1 LIKE CONCAT('%',col_2,'%')