以兩列對 MySQL 表進行排序？

借助以下語法以兩列對MySQL 表進行排序-

order by yourColumnName1 DESC,yourColumnName2 DESC;

讓我們先為我們的範例建立一個表格-

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

借助insert指令向表中插入記錄。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)

現在，應用上述語法對 MySQL 表中的兩個欄位進行排序。查詢如下 -

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

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)

或您可以藉助 DESC 指令按降序執行。查詢如下 -

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

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)

注意 - 主要排序首先起作用。

以上是以兩列對 MySQL 表進行排序？的詳細內容。更多資訊請關注PHP中文網其他相關文章！