如何在 MySQL 中按 DESC 或 ASC 順序對 varchar 數值列進行排序?
首先建立一張表 −
mysql> create table DemoTable726 (Value varchar(100)); Query OK, 0 rows affected (0.60 sec)
使用插入命令在表中插入一些記錄 −
mysql> insert into DemoTable726 values('100'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable726 values('10'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable726 values('110'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable726 values('2000'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable726 values('1000'); Query OK, 1 row affected (0.14 sec)
使用 select 語句從表中顯示所有記錄 −
mysql> select *from DemoTable726;
將生成以下輸出 -
+-------+ | Value | +-------+ | 100 | | 10 | | 110 | | 2000 | | 1000 | +-------+ 5 rows in set (0.00 sec)
以下是按升序排序 varchar 數值列的查詢 −
mysql> select *from DemoTable726 order by CAST(Value AS DECIMAL(20,2));
將生成以下輸出 -
+-------+ | Value | +-------+ | 10 | | 100 | | 110 | | 1000 | | 2000 | +-------+ 5 rows in set (0.00 sec)
以下是按降序排序並顯示結果的查詢 −
mysql> select *from DemoTable726 order by CAST(Value AS DECIMAL(20,2)) DESC;
將生成以下輸出 -
+-------+ | Value | +-------+ | 2000 | | 1000 | | 110 | | 100 | | 10 | +-------+ 5 rows in set (0.00 sec)
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