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在MySQL中至少获得x行数？

2024-04-29 10:25:05 366

要获得至少x个行，您需要使用LIMIT子句。以下是语法-

select *from yourTableName order by yourColumnName DESC limit yourXNumberOfRows;

让我们首先创建一个表-

mysql> create table DemoTable (
   EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY,EmployeeName varchar(100)
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(EmployeeName) values('Chris');
mysql> insert into DemoTable(EmployeeName) values('David');
mysql> insert into DemoTable(EmployeeName) values('Bob');
mysql> insert into DemoTable(EmployeeName) values('Robert');
mysql> insert into DemoTable(EmployeeName) values('Mike');
mysql> insert into DemoTable(EmployeeName) values('Sam');

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-

+------------+--------------+
| EmployeeId | EmployeeName |
+------------+--------------+
|          1 | Chris        |
|          2 | David        |
|          3 | Bob          |
|          4 | Robert       |
|          5 | Mike         |
|          6 | Sam          |
+------------+--------------+
6 rows in set (0.00 sec)

以下是在MySQL中获取至少x个行的查询。在这里，我们只显示2行-

mysql> select *from DemoTable order by EmployeeName DESC limit 2;

这将产生以下输出-

+------------+--------------+
| EmployeeId | EmployeeName |
+------------+--------------+
| 6          | Sam          |
| 4          | Robert       |
+------------+--------------+
2 rows in set (0.02 sec)

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在MySQL中至少获得x行数？

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