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MySQL按大小写排序？

2024-05-02 02:42:03 329

为此，请使用orderbynullif()。让我们首先创建一个表-

mysql> create table DemoTable672(
   CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   CustomerName varchar(100),
   CustomerAmount int
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable672(CustomerName,CustomerAmount) values('Chris',560);
mysql> insert into DemoTable672(CustomerName,CustomerAmount) values('Robert',null);
mysql> insert into DemoTable672(CustomerName,CustomerAmount) values('',450);
mysql> insert into DemoTable672(CustomerName,CustomerAmount) values('David',456);
mysql> insert into DemoTable672(CustomerName,CustomerAmount) values('Carol',786);

使用select语句显示表中的所有记录-

mysql> select *from DemoTable672;

这将产生以下输出-

+------------+--------------+----------------+
| CustomerId | CustomerName | CustomerAmount |
+------------+--------------+----------------+
| 1          | Chris       | 560             |
| 2          | Robert      | NULL            |
| 3          |             | 450             |
| 4          | David       | 456             |
| 5          | Carol       | 786             |
+------------+--------------+----------------+
5 rows in set (0.00 sec)

以下是如何通过大小写执行MySQL命令。在这里，我们还使用FIELD()了不区分大小写的搜索-

mysql> select *from DemoTable672 ORDER BY NULLIF(CustomerName,'') IS NULL, FIELD(CustomerAmount,560,786,450,456);

这将产生以下输出-

+------------+--------------+----------------+
| CustomerId | CustomerName | CustomerAmount |
+------------+--------------+----------------+
| 2          | Robert       | NULL           |
| 1          | Chris        | 560            |
| 5          | Carol        | 786            |
| 4          | David        | 456            |
| 3          |              | 450            |
+------------+--------------+----------------+
5 rows in set (0.04 sec)

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MySQL按大小写排序？

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