取得当天:
SELECT curdate();
mysql> SELECT curdate();
+------------+
| curdate()
+------------+
| 2013-07-29 |
+------------+
取得当前日期:
mysql> select now();
+---------------------+
| now()
+---------------------+
| 2013-07-29 22:10:40 |
+---------------------+
取得前一天:
mysql> select date_sub(curdate(),interval 1 day);
+------------------------------------+
| date_sub(curdate(),interval 1 day) |
+------------------------------------+
| 2013-07-28
+------------------------------------+
括号中为当天时间的前一天,如果统计前几天就将括号中的’1’改成相应的天数。如果要算月或年,直接将day改为month或year即可
mysql> SELECT YEAR(DATE_SUB(CURDATE(),INTERVAL 1 DAY));
+------------------------------------------+
| YEAR(DATE_SUB(CURDATE(),INTERVAL 1 DAY)) |
+------------------------------------------+
|
+------------------------------------------+