sql 中有两列,当第一列的字符串相同时,第二列相加答:mysql> CREATE TABLE TT ( A VARCHAR(10) NOT NULL,B INT NOT NULL)ENGINE=INNODB DEF AULT CHARSET=UTF8;Query OK, 0 rows affected (0.06 sec)mysql> INSERT INTO TT VALUES ('aa',3),('aa',4),('aa',5);Query OK, 3 rows affected (0.00 sec)Records: 3 Duplicates: 0 ...