使用单个 MySQL 查询更新两列
mysqlmysqli database更新于 2024/1/9 2:36:00
为此，您只需使用一次 SET 命令。让我们首先创建一个表 −
mysql> create table DemoTable1909 ( Id int NOT NULL, FirstName varchar(20), LastName varchar(20) ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1909 values(101,'John','Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1909 values(102,'John','Doe'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1909 values(103,'Adam','Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1909 values(104,'David','Miller'); Query OK, 1 row affected (0.00 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1909;
这将产生以下输出 −
+-----+-----------+----------+ | Id | FirstName | LastName | +-----+-----------+----------+ | 101 | John | Smith | | 102 | John | Doe | | 103 | Adam | Smith | | 104 | David | Miller | +-----+-----------+----------+ 4 rows in set (0.00 sec)
这是更新两列值的查询 −
mysql> update DemoTable1909 set FirstName='Carol',LastName='Taylor' where Id=103; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0
让我们再次检查表记录 −
mysql> select * from DemoTable1909;
这将产生以下输出 −
+-----+-----------+----------+ | Id | FirstName | LastName | +-----+-----------+----------+ | 101 | John | Smith | | 102 | John | Doe | | 103 | Carol | Taylor | | 104 | David | Miller | +-----+-----------+----------+ 4 rows in set (0.00 sec)
