如何在 MySQL 中从表中选择除最后一行之外的所有行?
mysqlmysqli database
您需要使用 != 运算符和子查询。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) -> ); Query OK, 0 rows affected (0.65 sec)
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);
Query OK, 1 row affected (0.12 sec)
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('Carol',28);
Query OK, 1 row affected (0.18 sec)
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('Mike',22);
Query OK, 1 row affected (0.13 sec)
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('Sam',29);
Query OK, 1 row affected (0.14 sec)
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('David',27);
Query OK, 1 row affected (0.11 sec)
mysql> insert into AllRecordsExceptLastOne(UserName,UserAge) values('Larry',24);
Query OK, 1 row affected (0.20 sec)
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)
以下查询用于从表中选择除最后一行之外的所有行−
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)
