MySQL中ADDDATE()函數的使用教程，mysqladddate

MySQL中ADDDATE()函數的使用教程，mysqladddate

復制代碼 代碼如下:ADDDATE(date,INTERVAL expr unit), ADDDATE(expr,days)

當被調用的第二個參數的區間形式，ADDDATE()是DATE_ADD()的同義詞。相關功能SUBDATE()是DATE_SUB()的代名詞。對於區間上的單元參數的詳細信息，請參閱DATE_ADD()的說明。

mysql> SELECT DATE_ADD('1998-01-02', INTERVAL 31 DAY);
+---------------------------------------------------------+
| DATE_ADD('1998-01-02', INTERVAL 31 DAY)         |
+---------------------------------------------------------+
| 1998-02-02                       |
+---------------------------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT ADDDATE('1998-01-02', INTERVAL 31 DAY);
+---------------------------------------------------------+
| ADDDATE('1998-01-02', INTERVAL 31 DAY)         |
+---------------------------------------------------------+
| 1998-02-02                       |
+---------------------------------------------------------+
1 row in set (0.00 sec)

當被調用的第二個參數的形式，MySQL的把它作為一個整數天數添加到expr。

mysql> SELECT ADDDATE('1998-01-02', 31);
+---------------------------------------------------------+
| DATE_ADD('1998-01-02', INTERVAL 31 DAY)         |
+---------------------------------------------------------+
| 1998-02-02                       |
+---------------------------------------------------------+
1 row in set (0.00 sec)