小编use*_*216的帖子

我有两个MySQL表（testa，resa），如下所示：

       CREATE TABLE RESA (
       `tdate` date,
       `reg` varchar(4), 
       `num` int(2), 
       `P1`  int(2), 
       `P2`  int(2),    
       `P3`  int(2), 
       `P4`  int(2)   
       ); 

       CREATE TABLE TESTA (
       `tdate` date,
       `reg` varchar(4), 
       `numa` int(2), 
       `numb` int(2),
       `name` varchar(10),
       `reso` varchar(2)
       );

       INSERT INTO RESA VALUES 
       ("2015-12-06", 'NERA', 2, 1,2,3,4),
       ("2015-12-06", 'WAS', 5, 5,6,7,9),
       ("2015-12-08", 'NERA', 1, 3,5,6,8);

      INSERT INTO TESTA VALUES 
      ("2015-12-06", 'NERA', 2,1, 'Qalyub',""),
      ("2015-12-06", 'NERA', 2,2, 'Kunjin',""),
      ("2015-12-06", 'NERA', 2,3, 'Carrizal',""),
      ("2015-12-07", 'NERA', 2,4, 'Amur',""),
      ("2015-12-06", 'NERA', 2,6, 'Heni',""),
      ("2015-12-06", 'NERA', 2,7, …