日日操夜夜添-日日操影院-日日草夜夜操-日日干干-精品一区二区三区波多野结衣-精品一区二区三区高清免费不卡

借助以下語法按兩列對 MySQL 表進行排序 –

order by yourColumnName1 DESC,yourColumnName2 DESC;

登錄后復制

讓我們首先為我們的示例創建一個表 –

mysql> create table OrderByDemo
   -> (
   -> StudentId int,
   -> StudentName varchar(100),
   -> StudentAge int
   -> );
Query OK, 0 rows affected (0.57 sec)

登錄后復制

借助insert命令向表中插入記錄。查詢如下 –

mysql> insert into OrderByDemo values(1,'John',23);
Query OK, 1 row affected (0.20 sec)
mysql> insert into OrderByDemo values(3,'Johnson',24);
Query OK, 1 row affected (0.27 sec)
mysql> insert into OrderByDemo values(4,'Carol',26);
Query OK, 1 row affected (0.14 sec)
mysql> insert into OrderByDemo values(2,'David',20);
Query OK, 1 row affected (0.13 sec)

登錄后復制

現在，應用上述語法對 MySQL 表中的兩列進行排序。查詢如下 –

mysql> select *from OrderByDemo order by StudentId ASC, StudentAge ASC;

登錄后復制

以下是按升序對兩列進行排序的輸出 –

+-----------+-------------+------------+
| StudentId | StudentName | StudentAge |
+-----------+-------------+------------+
|         1 | John        |         23 |
|         2 | David       |         20 |
|         3 | Johnson     |         24 |
|         4 | Carol       |         26 |
+-----------+-------------+------------+
4 rows in set (0.00 sec)

登錄后復制

或者您可以借助 DESC 命令按降序執行。查詢如下 –

mysql> select *from OrderByDemo order by StudentId DESC,StudentAge DESC;

登錄后復制

以下是輸出 –

+-----------+-------------+------------+
| StudentId | StudentName | StudentAge |
+-----------+-------------+------------+
|         4 | Carol       |         26 |
|         3 | Johnson     |         24 |
|         2 | David       |         20 |
|         1 | John        |         23 |
+-----------+-------------+------------+
4 rows in set (0.00 sec)

登錄后復制

注意 – 主要排序首先起作用。

以上就是按兩列對 MySQL 表進行排序？的詳細內容，更多請關注www.92cms.cn其它相關文章！