c d 1 2 a 3 b a b 4 e 5 f 6 g a b 4 e 5 f 6 g a b 4 e 5 f 6 g c d 1 2 a 3 b c d e 1 2 2 a 2 3 b 2 CONCAT_WS(pkCrash, strCrash) 1 id val elt(two.val,'one','two') 1 1 one 2 1 one 4 2 two
