datetimesqlserver
① sqlserver datetime为空对应的时间是多少
sql server中datetime类型字段设置默认值的方法:
一、在企业管理器中选中要修改的表格,点击鼠标右键,弹出菜单点击“设计表”
2、选中要设置的字段,在默认值中绑定默认值
默认值为当前时间:getdate()
默认值为指定时间:'20160101',该格式各数据库版本有细微差异,示例在SQL2000环境测试:
② 向sqlserver插入DateTime时有失去了datetime溢出异常
估计插了个最小的值 即DateTime.MinValue
原因:datetime 时间类型范围值必须在1753 年 1 月 1 日到 9999 年 12 月 31 日这个区间内
解决
要么插入值在这个范围类
要么修改数据类型 改为datetime2
③ sqlserver:格式化时间datetime
select cast(convert(varchar(10),getdate(),120) as datetime)
④ sqlserver datetime类型数据查询问题
SELECT * FROM table WHERE time > CONVERT(CHAR(8),DATEADD(Month,-1,GETDATE()),120)+'26 23:59:59:999' AND time < CONVERT(CHAR(8),GETDATE(),120)+'25'
⑤ SqlServer中DateTime类型怎样把输出的秒去掉,只取出年月日和几点几分
sql
convert
用法
convert(data_type,expression[,style])
convert(varchar(10),字段名,转换格式)
说明:
此样式一般在时间类型(datetime,smalldatetime)与字符串类型(nchar,nvarchar,char,varchar)
相互转换的时候才用到.
例子:
select
convert(varchar(30),getdate(),101)
now
结果为:
now
---------------------------------------
|09/15/2001
===================================================================
style数字在转换时间时的含义如下:
------------------------------------------------------------------------------------------------------------
style(2位表示年份)
|
style(4位表示年份)
|
输入输出格式
------------------------------------------------------------------------------------------------------------
0
|
100
|
mon
dd
yyyy
hh:miam(或pm)
------------------------------------------------------------------------------------------------------------
1
|
101
美国
|
mm/dd/yy
------------------------------------------------------------------------------------------------------------
2
|
102
ansi
|
yy-mm-dd
------------------------------------------------------------------------------------------------------------
3
|
103
英法
|
dd/mm/yy
------------------------------------------------------------------------------------------------------------
4
|
104
德国
|
dd.mm.yy
----------------------------------------------------
⑥ 怎么插入datetime 一条数据 sqlserver
可以使用 CONVERT 函数,将 字符串类型的数据,转换为 datetime 类型。
CONVERT(DATETIME, '2012-01-02 09:06:18', 120)
其中那个 120 的参数, 取决于你前面的字符串信息是什么格式的。
执行下面的语句, 就可以一一对应得上。
SELECT 0 AS ID , Convert(VARCHAR(30), GETDATE(), 0 ) AS result UNION ALL
SELECT 100 AS ID , Convert(VARCHAR(30), GETDATE(), 100) AS result UNION ALL
SELECT 1 AS ID , Convert(VARCHAR(30), GETDATE(), 1 ) AS result UNION ALL
SELECT 101 AS ID , Convert(VARCHAR(30), GETDATE(), 101) AS result UNION ALL
SELECT 2 AS ID , Convert(VARCHAR(30), GETDATE(), 2 ) AS result UNION ALL
SELECT 102 AS ID , Convert(VARCHAR(30), GETDATE(), 102) AS result UNION ALL
SELECT 2 AS ID , Convert(VARCHAR(30), GETDATE(), 2 ) AS result UNION ALL
SELECT 102 AS ID , Convert(VARCHAR(30), GETDATE(), 102) AS result UNION ALL
SELECT 3 AS ID , Convert(VARCHAR(30), GETDATE(), 3 ) AS result UNION ALL
SELECT 103 AS ID , Convert(VARCHAR(30), GETDATE(), 103) AS result UNION ALL
SELECT 4 AS ID , Convert(VARCHAR(30), GETDATE(), 4 ) AS result UNION ALL
SELECT 104 AS ID , Convert(VARCHAR(30), GETDATE(), 104) AS result UNION ALL
SELECT 5 AS ID , Convert(VARCHAR(30), GETDATE(), 5 ) AS result UNION ALL
SELECT 105 AS ID , Convert(VARCHAR(30), GETDATE(), 105) AS result UNION ALL
SELECT 6 AS ID , Convert(VARCHAR(30), GETDATE(), 6 ) AS result UNION ALL
SELECT 106 AS ID , Convert(VARCHAR(30), GETDATE(), 106) AS result UNION ALL
SELECT 7 AS ID , Convert(VARCHAR(30), GETDATE(), 7 ) AS result UNION ALL
SELECT 107 AS ID , Convert(VARCHAR(30), GETDATE(), 107) AS result UNION ALL
SELECT 8 AS ID , Convert(VARCHAR(30), GETDATE(), 8 ) AS result UNION ALL
SELECT 108 AS ID , Convert(VARCHAR(30), GETDATE(), 108) AS result UNION ALL
SELECT 9 AS ID , Convert(VARCHAR(30), GETDATE(), 9 ) AS result UNION ALL
SELECT 109 AS ID , Convert(VARCHAR(30), GETDATE(), 109) AS result UNION ALL
SELECT 10 AS ID , Convert(VARCHAR(30), GETDATE(), 10 ) AS result UNION ALL
SELECT 110 AS ID , Convert(VARCHAR(30), GETDATE(), 110) AS result UNION ALL
SELECT 11 AS ID , Convert(VARCHAR(30), GETDATE(), 11 ) AS result UNION ALL
SELECT 111 AS ID , Convert(VARCHAR(30), GETDATE(), 111) AS result UNION ALL
SELECT 12 AS ID , Convert(VARCHAR(30), GETDATE(), 12 ) AS result UNION ALL
SELECT 112 AS ID , Convert(VARCHAR(30), GETDATE(), 112) AS result UNION ALL
SELECT 13 AS ID , Convert(VARCHAR(30), GETDATE(), 13 ) AS result UNION ALL
SELECT 113 AS ID , Convert(VARCHAR(30), GETDATE(), 113) AS result UNION ALL
SELECT 14 AS ID , Convert(VARCHAR(30), GETDATE(), 14 ) AS result UNION ALL
SELECT 114 AS ID , Convert(VARCHAR(30), GETDATE(), 114) AS result UNION ALL
SELECT 20 AS ID , Convert(VARCHAR(30), GETDATE(), 20 ) AS result UNION ALL
SELECT 120 AS ID , Convert(VARCHAR(30), GETDATE(), 120) AS result UNION ALL
SELECT 21 AS ID , Convert(VARCHAR(30), GETDATE(), 21 ) AS result UNION ALL
SELECT 121 AS ID , Convert(VARCHAR(30), GETDATE(), 121) AS result
⑦ 判断sql server中datetime字段是否为null的问题
首先要看看你表里那个字段是否允许为null
如果允许,可以
update
表名
set
字段名=null
where
字段名='2009-08-25'
如果表里字段不允许为null,那要先改表字段的属性,后再update
⑧ mybatis查询sqlServer中的datetime类型查无资料怎么回事
用myeclipse查询数据库datetime类型的字段结果多了“.0”是因为时间精确到毫秒。
如果在应用程序中使用以下语句设定日期格式,那么就会多出毫秒。
DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")
比如:
假设时间为-2016-03-11 12:50:49.00
{0:yyyy-MM-dd hh:mm:ss.fff}:使用12小时制格式化日期
⑨ 怎么向sqlserver插入datetime 格式数据
可以插入短日期的字符形式,也可以插入长日期的字符形式。
1、创建测试表:
createtabletest
(ttimedatetime);
2、插入短日期:
insertintotestvalues('2015-09-14');
结果截图: