MySQL 查询对值大于零的行进行排序?
mysqlmysqli database
首先我们创建一个表。以下是查询 −
mysql> create table gettingAndOrderingRowsDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Value int -> ); Query OK, 0 rows affected (1.35 sec)
下面是使用 insert 命令在表中插入一些记录的查询 −
mysql> insert into gettingAndOrderingRowsDemo(Value) values(10); Query OK, 1 row affected (0.33 sec) mysql> insert into gettingAndOrderingRowsDemo(Value) values(13); Query OK, 1 row affected (0.32 sec) mysql> insert into gettingAndOrderingRowsDemo(Value) values(0); Query OK, 1 row affected (0.17 sec) mysql> insert into gettingAndOrderingRowsDemo(Value) values(20); Query OK, 1 row affected (0.26 sec) mysql> insert into gettingAndOrderingRowsDemo(Value) values(30); Query OK, 1 row affected (0.50 sec) mysql> insert into gettingAndOrderingRowsDemo(Value) values(60); Query OK, 1 row affected (0.24 sec) mysql> insert into gettingAndOrderingRowsDemo(Value) values(0); Query OK, 1 row affected (0.28 sec) mysql> insert into gettingAndOrderingRowsDemo(Value) values(45); Query OK, 1 row affected (0.15 sec) mysql> insert into gettingAndOrderingRowsDemo(Value) values(0); Query OK, 1 row affected (0.69 sec)
以下是使用 select 语句显示表中的所有记录的查询 −
mysql> select * from gettingAndOrderingRowsDemo;
这将产生以下输出 −
+----+-------+ | Id | Value | +----+-------+ | 1 | 10 | | 2 | 13 | | 3 | 0 | | 4 | 20 | | 5 | 30 | | 6 | 60 | | 7 | 0 | | 8 | 45 | | 9 | 0 | +----+-------+ 9 rows in set (0.00 sec)
以下是查询大于零的值 −
mysql> select * from gettingAndOrderingRowsDemo -> order by Value=0,Value;
这将产生以下输出 −
+----+-------+ | Id | Value | +----+-------+ | 1 | 10 | | 2 | 13 | | 4 | 20 | | 5 | 30 | | 8 | 45 | | 6 | 60 | | 3 | 0 | | 7 | 0 | | 9 | 0 | +----+-------+ 9 rows in set (0.00 sec)
