本节内容：
sql时间段查询
ACCESS：
复制代码 代码示例:
select * from table where date1<#2008-1-20# and date2>#2007-8-30#
mysql：
复制代码 代码示例:
select * from table where date1<'2008-1-20' and date2>'2007-3-30'
或者：
select * from table where date1 between '2008-1-20' and '2007-3-30'
以上mysql时间查询中，其中date1,date2都是日期类型的字段。
sQL时间型查询语句：
2007年12月04日 星期二 13:54
select * from jy_jjgl a ,jy_jygl b where convert(varchar(10),a.shtime,120)='2007-11-27'
1，显示本月第一天
复制代码 代码示例:
SELECT
dateadd(mm,
datediff(mm,0,getdate()),0)
select convert(datetime,convert(varchar(8),getdate(),
120)+'01',120)
2，显示本月最后一天
复制代码 代码示例:
select dateadd(day,-1,convert(datetime,convert
(varchar(8),dateadd(month,1,getdate()),120)+'01',120))
SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(m,0,getdate())+1,0))
3，上个月的最后一天
复制代码 代码示例:
SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(mm,0,getdate()),0))
4，本月的第一个星期一i
复制代码 代码示例:
select DATEADD(wk,DATEDIFF(wk,0, dateadd(dd,6-datepart(
day,getdate()),getdate())),0)
5，本年的第一天
复制代码 代码示例:
SELECT DATEADD(yy,DATEDIFF(yy,0,getdate()),0)
6，本年的最后一天
复制代码 代码示例:
SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate())+1,0))
7，去年的最后一天
复制代码 代码示例:
SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate()),0))
8，本季度的第一天
复制代码 代码示例:
SELECT DATEADD(qq,DATEDIFF(qq,0,getdate()),0)
9，本周的星期一
复制代码 代码示例:
SELECT DATEADD(wk,DATEDIFF(wk,0,getdate()),0)
10，查询本月的记录
复制代码 代码示例:
select * from tableName where DATEPART(mm, theDate)
=DATEPART(mm, GETDATE()) and DATEPART(yy, theDate)
= DATEPART(yy, GETDATE())
11，查询本周的记录
复制代码 代码示例:
select * from tableName where DATEPART(wk, theDate) = DATEPART
(wk, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())
12，查询本季的记录 注：其中:GETDATE()是获得系统时间的函数。
复制代码 代码示例:
select * from tableName where DATEPART(qq, theDate) = DATEPART
(qq, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())
13，获取当月总天数:
复制代码 代码示例:
select DATEDIFF(dd,getdate(),DATEADD
(mm, 1, getdate()))
select datediff(day,
dateadd(mm, datediff(mm,'',getdate()), ''),
dateadd(mm, datediff(mm,'',getdate()), '1900-02-01'))
14，获取当前为星期几
复制代码 代码示例:
DATENAME(weekday, getdate())
–返回当前时间
mysql> select now(),date(now()),sysdate();
+---------------------+-------------+---------------------+
| now() | date(now()) | sysdate() |
+---------------------+-------------+---------------------+
| 2008-12-02 10:11:36 | 2008-12-02 | 2008-12-02 10:11:36 |
+---------------------+-------------+---------------------+
1 row in set (0.00 sec)
mysql> select curdate(),curdate()+0,curtime(),curtime()+0;
+---------------------+-------------+---------------------+
| curdate() | curdate()+0 | curtime() | curtime()+0 |
+---------------------+-------------+---------------------+
| 2008-12-02 | 20081202 | 10:00:33 | 100033.000000 |
+---------------------+-------------+---------------------+
–返回日期当月最后一天
mysql> select last_day('2008-12-02');
+------------------------+
| last_day('2008-12-02') |
+------------------------+
| 2008-12-31 |
+------------------------+
1 row in set (0.00 sec)
–返回日期的星期几
mysql> select dayname('2008-12-02'),dayofweek('2008-12-02');
+-----------------------+-------------------------+
| dayname('2008-12-02') | dayofweek('2008-12-02') |
+-----------------------+-------------------------+
| tuesday | 3 |
+-----------------------+-------------------------+
1 row in set (0.00 sec)
–返回日期的年，月，日
mysql> select month('2008-12-02'),year('2008-12-02'),day('2008-12-02');
+---------------------+--------------------+-------------------+
| month('2008-12-02') | year('2008-12-02') | day('2008-12-02') |
+---------------------+--------------------+-------------------+
| 12 | 2008 | 2 |
+---------------------+--------------------+-------------------+
1 row in set (0.00 sec)
–返回日期的小时，分，秒
mysql> select hour('10:05:03'),minute('10:05:03'),second('10:05:03');
+------------------+--------------------+--------------------+
| hour('10:05:03') | minute('10:05:03') | second('10:05:03') |
+------------------+--------------------+--------------------+
| 10 | 5 | 3 |
+------------------+--------------------+--------------------+
1 row in set (0.00 sec)
1，subdate(d,t)：起始时间加上一段时间（year,month,day…）
复制代码 代码示例:
mysql> select date_add('1998-01-02', interval 31 day),adddate('1998-01-02', 31);
+-----------------------------------------+---------------------------+
| date_add('1998-01-02', interval 31 day) | adddate('1998-01-02', 31) |
+-----------------------------------------+---------------------------+
| 1998-02-02 | 1998-02-02 |
+-----------------------------------------+---------------------------+
1 row in set (0.00 sec)
mysql> select date_add('1998-01-02',interval 2 year);
+-----------------------------------------------------+
| date_add('1998-01-02', interval 2 year)
+-----------------------------------------------------+
| 2000-01-02
+-----------------------------------------------------+
1 row in set (0.00 sec)
mysql> select date_add('1998-01-02', interval 2 hour);
+-----------------------------------------------------+
| date_add('1998-01-02', interval 2 hour)
+-----------------------------------------------------+
| 1998-01-02 02:00:00
+-----------------------------------------------------+
1 row in set (0.00 sec)
2，subdate(d,t)：起始时间减去一段时间
复制代码 代码示例:
mysql> select subdate('1998-01-02', interval 31 day),subdate('1998-01-02', 31);
+----------------------------------------+---------------------------+
| subdate('1998-01-02', interval 31 day) | subdate('1998-01-02', 31) |
+----------------------------------------+---------------------------+
| 1997-12-02 | 1997-12-02 |
+----------------------------------------+---------------------------+
1 row in set (0.00 sec)
3，addtime(d,t):起始时间d加入时间t
复制代码 代码示例:
mysql> select addtime('1997-12-31 23:59:50','00:00:05'), addtime('23:59:50','00:00:05') ;
+-------------------------------------------+--------------------------------+
| addtime('1997-12-31 23:59:50','00:00:05') | addtime('23:59:50','00:00:05') |
+-------------------------------------------+--------------------------------+
| 1997-12-31 23:59:55 | 23:59:55 |
+-------------------------------------------+--------------------------------+
1 row in set (0.00 sec)
4，subtime(d,t):起始时间d减去时间t
复制代码 代码示例:
mysql> select subtime('1997-12-31 23:59:50','00:00:05'), subtime('23:59:50','00:00:05');
+-------------------------------------------+--------------------------------+
| subtime('1997-12-31 23:59:50','00:00:05') | subtime('23:59:50','00:00:05') |
+-------------------------------------------+--------------------------------+
| 1997-12-31 23:59:45 | 23:59:45 |
+-------------------------------------------+--------------------------------+
1 row in set (0.00 sec)
5，datediff(d1,d2):返回起始时间d1和结束时间d2之间的天数
复制代码 代码示例:
mysql> select datediff('1997-12-31 23:59:59','1997-12-30');
+----------------------------------------------+
| datediff('1997-12-31 23:59:59','1997-12-30') |
+----------------------------------------------+
| 1 |
+----------------------------------------------+
1 row in set (0.00 sec)
6，date_format(date,format):根据format字符串显示date值的格式
复制代码 代码示例:
mysql> select date_format('2008-12-02 22:23:00', '%y %m %m %h:%i:%s');
+---------------------------------------------------------+
| date_format('2008-12-02 22:23:00', '%y %m %m %h:%i:%s') |
+---------------------------------------------------------+
| 2008 12 12 22:23:00 |
+---------------------------------------------------------+
1 row in set (0.00 sec)
7，str_to_date(str,format) 字符串转化为时间
复制代码 代码示例:
mysql> select str_to_date('04/31/2004', '%m/%d/%y %h:%i:s');
+-----------------------------------------------+
| str_to_date('04/31/2004', '%m/%d/%y %h:%i:s') |
+-----------------------------------------------+
| 2004-04-31 00:00:00 |
+-----------------------------------------------+
1 row in set (0.00 sec)
8，timestamp(expr) , timestamp(expr,expr2) :
对于一个单参数,该函数将日期或日期时间表达式 expr 作为日期时间值返回。
对于两个参数, 它将时间表达式 expr2添加到日期或日期时间表达式 expr 中，将theresult作为日期时间值返回。
复制代码 代码示例:
mysql> select timestamp('2003-12-31'), timestamp('2003-12-31 12:00:00','12:00:00');
+-------------------------+---------------------------------------------+
| timestamp('2003-12-31') | timestamp('2003-12-31 12:00:00','12:00:00') |
+-------------------------+---------------------------------------------+
| 2003-12-31 00:00:00 | 2004-01-01 00:00:00 |
+-------------------------+---------------------------------------------+
1 row in set (0.00 sec)
9，取当天0点0分，下一天0点0分
复制代码 代码示例:
mysql> select timestamp(date(sysdate())),timestamp(adddate(date(sysdate()),1));
+----------------------------+---------------------------------------+
| timestamp(date(sysdate())) | timestamp(adddate(date(sysdate()),1)) |
+----------------------------+---------------------------------------+
| 2008-12-02 00:00:00 | 2008-12-03 00:00:00 |
+----------------------------+---------------------------------------+
1 row in set (0.00 sec)
