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MySQL CASE语句或PHP if语句哪个更快？

2024-05-19 00:10:04 450

与PHPif语句相比，MySQLCASE语句更快。PHPif语句花费太多时间，因为它加载数据然后处理，而CASE语句则不会。

让我们首先创建一个表并解决一个MySQLCASE语句的示例-

create table DemoTable (Value int);

使用插入命令在表中插入一些记录-

insert into DemoTable values(100);
insert into DemoTable values(500);
insert into DemoTable values(1000);

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-

+-------+
| Value |
+-------+
| 100   |
| 500   |
| 1000  |
+-------+
3 rows in set (0.00 sec)

以下是对MySQLCASE语句的查询-

select Value, case when Value > 500 THEN "It is greater than or equal to 1000"
   else
   "It is lower than 1000"
   end as comparison from DemoTable;

这将产生以下输出-

+-------+-------------------------------------+
| Value | comparison                          |
+-------+-------------------------------------+
|   100 | It is lower than 1000               |
|   500 | It is lower than 1000               |
| 1000 | It is greater than or equal to 1000  |
+-------+-------------------------------------+
3 rows in set (0.00 sec)

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MySQL CASE语句或PHP if语句哪个更快？

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