MySQL按大小写排序？
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)