MySQL 如何使用ORDER BY DESC并仅显示前3条记录

为此，您可以使用ORDER BY DESC和LIMIT。让我们首先创建一个表 –

mysql> create table DemoTable
(
    UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
    UserName varchar(100)
);
Query OK, 0 rows affected (0.59 sec)

使用insert命令在表中插入一些记录 –

mysql> insert into DemoTable(UserName) values('Chris');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(UserName) values('Robert');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(UserName) values('Bob');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(UserName) values('David');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable(UserName) values('Mike');
Query OK, 1 row affected (0.10 sec)

使用select语句显示表中的所有记录 –

mysql> select *from DemoTable;

这将产生以下输出 –

+--------+----------+
| UserId | UserName |
+--------+----------+
|      1 | Chris    |
|      2 | Robert   |
|      3 | Bob      |
|      4 | David    |
|      5 | Mike     |
+--------+----------+
5 rows in set (0.00 sec)

以下是对MySQL列应用ORDER BY DESC后仅显示前3条记录的查询 –

mysql> select *from DemoTable order by UserId DESC LIMIT 0,3;

这将产生以下输出 –

+--------+----------+
| UserId | UserName |
+--------+----------+
|      5 | Mike     |
|      4 | David    |
|      3 | Bob      |
+--------+----------+
3 rows in set (0.00 sec)

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