SELECT * FROM tbl WHERE col_1 LIKE '%'+col_2+'%'
EDIT:Pro MySQL by ekvivalentní syntaxe byla:
SELECT * FROM tbl WHERE col_1 LIKE CONCAT('%',col_2,'%')
SELECT * FROM tbl WHERE col_1 LIKE '%'+col_2+'%'
EDIT:Pro MySQL by ekvivalentní syntaxe byla:
SELECT * FROM tbl WHERE col_1 LIKE CONCAT('%',col_2,'%')