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法律研究按 MySQL 中的最後 3 個字元排序？
你可以使用 ORDER BY RIGHT() 函式按 MySQL 中的最後 3 個字元排序。語法如下所示 -
SELECT *FROM yourTableName ORDER BY RIGHT(yourColumnName,3) yourSortingOrder;
只需將‘yourSortingOrder’替換為 ASC 或 DESC 以分別設定升序或降序。
為了理解上述語法，我們建立一個表。建立表的查詢如下所示 -
mysql> create table OrderByLast3Chars -> ( -> EmployeeId int NOT NULL AUTO_INCREMENT, -> EmployeeName varchar(20), -> EmployeeAge int, -> PRIMARY KEY(EmployeeId) -> ); Query OK, 0 rows affected (0.56 sec)
使用 insert 命令在表中插入一些記錄。查詢如下所示 -
mysql> insert into OrderByLast3Chars(EmployeeName,EmployeeAge) values('Carol_901',24);
Query OK, 1 row affected (0.14 sec)
mysql> insert into OrderByLast3Chars(EmployeeName,EmployeeAge) values('Bob_101',21);
Query OK, 1 row affected (0.19 sec)
mysql> insert into OrderByLast3Chars(EmployeeName,EmployeeAge) values('Sam_107',22);
Query OK, 1 row affected (0.20 sec)
mysql> insert into OrderByLast3Chars(EmployeeName,EmployeeAge) values('Mile_677',26);
Query OK, 1 row affected (0.19 sec)
mysql> insert into OrderByLast3Chars(EmployeeName,EmployeeAge) values('John_978',27);
Query OK, 1 row affected (0.75 sec)
mysql> insert into OrderByLast3Chars(EmployeeName,EmployeeAge) values('David_876',29);
Query OK, 1 row affected (0.28 sec)使用 select 語句從表中顯示所有記錄。查詢如下所示 -
mysql> select *from OrderByLast3Chars;
輸出如下 -
+------------+--------------+-------------+ | EmployeeId | EmployeeName | EmployeeAge | +------------+--------------+-------------+ | 1 | Carol_901 | 24 | | 2 | Bob_101 | 21 | | 3 | Sam_107 | 22 | | 4 | Mile_677 | 26 | | 5 | John_978 | 27 | | 6 | David_876 | 29 | +------------+--------------+-------------+ 6 rows in set (0.00 sec)
以下是按最後 3 個字元排序的查詢。
案例 1 - 按升序獲取結果。
查詢如下所示 -
mysql> select *from OrderByLast3Chars -> order by RIGHT(EmployeeName,3) asc;
輸出如下 -
+------------+--------------+-------------+ | EmployeeId | EmployeeName | EmployeeAge | +------------+--------------+-------------+ | 1 | Carol_901 | 24 | | 2 | Bob_101 | 21 | | 3 | Sam_107 | 22 | | 4 | Mile_677 | 26 | | 5 | John_978 | 27 | | 6 | David_876 | 29 | +------------+--------------+-------------+ 6 rows in set (0.00 sec)
案例 2 - 按降序獲取結果。查詢如下所示 -
mysql> select *from OrderByLast3Chars -> order by RIGHT(EmployeeName,3) desc;
輸出如下 -
+------------+--------------+-------------+ | EmployeeId | EmployeeName | EmployeeAge | +------------+--------------+-------------+ | 5 | John_978 | 27 | | 1 | Carol_901 | 24 | | 6 | David_876 | 29 | | 4 | Mile_677 | 26 | | 3 | Sam_107 | 22 | | 2 | Bob_101 | 21 | +------------+--------------+-------------+ 6 rows in set (0.00 sec)
更新時間： 2020 年 6 月 30 日
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