当我尝试将行更新到我的表时，我收到以下错误：

Question

mysql> select * from GSLAB;
+--------+--------------+
| empid  | destignation |
+--------+--------------+
| GS101  | Manager      |
| GS102  | ABC          |
| GS-103 | SAS          |
| GS-104 | dsSAS        |
| GS105  | EWSAS        |
| GS106  | EWQAS        |
+--------+--------------+
6 rows in set (0.00 sec)

mysql> update GSLAB set empid= substr(empid,4,15)||substr(empid,1,2)||'-' where empid substr(empid,1,3)<>'-';
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'substr(empid,1,3)<>'-'' at line 1
mysql> 

Answer 1

我使用concat函数而不是concat运算符＆＃39; ||＆＃39;

的MySQL＆GT;更新GSLAB set empid = concat（substr（empid，1,2），＆＃39; - ＆＃39;，substr（empid，4,15））其中substr（empid，1,3）＆lt;＆gt;＆＃ 39; - ＆＃39 ;;