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在更新MySQL表时执行操作（加，减，乘，除）？

2024-05-18 21:36:03 345

以下是执行加号（+）运算符的语法-

update yourTableName set yourColumnName3=(yourColumnName1+yourColumnName2)

上面的语法仅适用于加号运算符。您需要将-，*，/等符号更改为其他操作。让我们首先创建一个表-

create table DemoTable
   -> (
   -> Number1 int,
   -> Number2 int,
   -> AddResult int,
   -> MinusResult int,
   -> MultiplyResult int,
   -> DivideResult int
   -> );

使用插入命令在表中插入一些记录-

insert into DemoTable(Number1,Number2) values(40,20);

使用select语句显示表中的所有记录-

select *from DemoTable;

这将产生以下输出-

+---------+---------+-----------+-------------+----------------+--------------+
| Number1 | Number2 | AddResult | MinusResult | MultiplyResult | DivideResult |
+---------+---------+-----------+-------------+----------------+--------------+
|      40 |      20 |      NULL |        NULL |           NULL |         NULL |
+---------+---------+-----------+-------------+----------------+--------------+
1 row in set (0.00 sec)

以下是在MySQL中使用UPDATE时执行加，减，乘和除等运算的查询-

update DemoTable set AddResult=(Number1+Number2);
Rows matched: 1 Changed: 1 Warnings: 0

update DemoTable set MinusResult=(Number1-Number2);
Rows matched: 1 Changed: 1 Warnings: 0

update DemoTable set MultiplyResult=(Number1*Number2);
Rows matched: 1 Changed: 1 Warnings: 0

update DemoTable set DivideResult=(Number1/Number2);
Rows matched: 1 Changed: 1 Warnings: 0

让我们再次检查表记录-

select *from DemoTable;

这将产生以下输出-

+---------+---------+-----------+-------------+----------------+--------------+
| Number1 | Number2 | AddResult | MinusResult | MultiplyResult | DivideResult |
+---------+---------+-----------+-------------+----------------+--------------+
|      40 |      20 |        60 |          20 |            800 |            2 |
+---------+---------+-----------+-------------+----------------+--------------+
1 row in set (0.00 sec)

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在更新MySQL表时执行操作（加，减，乘，除）？

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