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                #### 3.3.4.4 行排序 你可能已經注意到, 在前面的示例中, 查詢的結果記錄并沒有按照特定的順序顯示. 當以某種有意義的方式對行進行排序時, 通過更容易檢查查詢輸出. 要對結果排序, 使用 `ORDER BY` 子句. 以下是動物的生日, 按照日期排序: ```sql mysql> SELECT name, birth FROM pet ORDER BY birth; +----------+------------+ | name | birth | +----------+------------+ | Buffy | 1989-05-13 | | Bowser | 1989-08-31 | | Fang | 1990-08-27 | | Fluffy | 1993-02-04 | | Claws | 1994-03-17 | | Slim | 1996-04-29 | | Whistler | 1997-12-09 | | Chirpy | 1998-09-11 | | Puffball | 1999-03-30 | +----------+------------+ ``` 在字符串類型類上, 排序與其它所有比較操作一樣, 通常以不區分大小寫的方式執行. 這意味著除了其大小寫之外, 其余相同列的順序是未定義的. 你可以強制使用 [`BINARY`](https://dev.mysql.com/doc/refman/8.0/en/cast-functions.html#operator_binary) 對列進行區分大小寫, 像是: `ORDER BY BINARY col_name`. 默認的排序順序是升序, 首先是最小的值, 若要按照相反的順序(降序)排序, 請將 `DESC` 關鍵字添加到正在排序的列的名稱中: ```sql mysql> SELECT name, birth FROM pet ORDER BY birth DESC; +----------+------------+ | name | birth | +----------+------------+ | Puffball | 1999-03-30 | | Chirpy | 1998-09-11 | | Whistler | 1997-12-09 | | Slim | 1996-04-29 | | Claws | 1994-03-17 | | Fluffy | 1993-02-04 | | Fang | 1990-08-27 | | Bowser | 1989-08-31 | | Buffy | 1989-05-13 | +----------+------------+ ``` 你可以對多個列進行排序, 也可以對不同的列進行不同的排序. 例如, 按照動物的類型進行升序排列, 然后按照動物類型內的出生日期進行降序排列 (最小的動物優先), 使用以下查詢: ```sql mysql> SELECT name, species, birth FROM pet ORDER BY species, birth DESC; +----------+---------+------------+ | name | species | birth | +----------+---------+------------+ | Chirpy | bird | 1998-09-11 | | Whistler | bird | 1997-12-09 | | Claws | cat | 1994-03-17 | | Fluffy | cat | 1993-02-04 | | Fang | dog | 1990-08-27 | | Bowser | dog | 1989-08-31 | | Buffy | dog | 1989-05-13 | | Puffball | hamster | 1999-03-30 | | Slim | snake | 1996-04-29 | +----------+---------+------------+ ``` `DESC` 關鍵字只適合緊接在它前面的列名 (`birth`); 它不影響 `species` 列的排列順序.
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