SELECT * FROM tbl WHERE col_1 LIKE '%'+col_2+'%'
EDITAR:para MySQL, la sintaxis equivalente sería:
SELECT * FROM tbl WHERE col_1 LIKE CONCAT('%',col_2,'%')
SELECT * FROM tbl WHERE col_1 LIKE '%'+col_2+'%'
EDITAR:para MySQL, la sintaxis equivalente sería:
SELECT * FROM tbl WHERE col_1 LIKE CONCAT('%',col_2,'%')