urned. Selected columns listed in\ncorresponding positions of each SELECT statement should have the same\ndata type. (For example, the first column selected by the first\nstatement should have the same type as the first column selected by the\nother statements.)\n\nURL: http://dev.mysql.com/doc/refman/5.7/en/union.html\n\n','','http://dev.mysql.com/doc/refman/5.7/en/union.html');