如何从表中选择除MySQL中的最后一行以外的所有行？
您需要将！=运算符与子查询一起使用。语法如下-
select *from yourTableName where yourIdColumnName != (select max(yourIdColumnName) from yourTableName );
为了理解上述语法，让我们创建一个表。创建表的查询如下-
mysql> create table AllRecordsExceptLastOne -> ( -> Id int NOT NULL AUTO_INCREMENT, -> UserName varchar(10), -> UserAge int -> , -> PRIMARY KEY(Id) -> );
现在，您可以使用insert命令在表中插入一些记录。查询如下-
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('John',21);
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('Carol',28);
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('Mike',22);
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('Sam',29);
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('David',27);
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('Larry',24);使用select语句显示表中的所有记录。查询如下-
mysql> select *from AllRecordsExceptLastOne;
以下是输出-
+----+----------+---------+ | Id | UserName | UserAge | +----+----------+---------+ | 1 | John | 21 | | 2 | Carol | 28 | | 3 | Mike | 22 | | 4 | Sam | 29 | | 5 | David | 27 | | 6 | Larry | 24 | +----+----------+---------+ 6 rows in set (0.00 sec)
这是从表中选择除最后一行以外的所有行的查询-
mysql> select *from AllRecordsExceptLastOne where Id!=(select max(Id) from AllRecordsExceptLastOne);
以下是输出-
+----+----------+---------+ | Id | UserName | UserAge | +----+----------+---------+ | 1 | John | 21 | | 2 | Carol | 28 | | 3 | Mike | 22 | | 4 | Sam | 29 | | 5 | David | 27 | +----+----------+---------+ 5 rows in set (0.04 sec)