在SQLServer 中查询指定的日期当天的数据,网上看到许多版本但较为复杂 这里使用
dateadd()函数实现此功能
SELECT CreatedOn FROM Employee
where CreatedOn BETWEEN '2012-6-21' AND dateadd(second,-1,dateadd(day,1,'2012-6-21'))
注:截止日期加一天再减一秒,如果需要更精细则只需要修改 second 为 nanosecond 没有更细了..
dateadd(
second,-1,dateadd(day,1,'2012-6-21'))
关于Dateadd函数 以下内容来自MSDN
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Syntax
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DATEADD (datepart , number , date )
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Arguments
- datepart
- Is the part of date to which an integer number is added. The following table lists all valid datepart arguments. User-defined variable equivalents are not valid.
| datepart |
Abbreviations |
| year |
yy, yyyy |
| quarter |
qq, q |
| month |
mm, m |
| dayofyear |
dy, y |
| day |
dd, d |
| week |
wk, ww |
| weekday |
dw, w |
| hour |
hh |
| minute |
mi, n |
| second |
ss, s |
| millisecond |
ms |
| microsecond |
mcs |
| nanosecond |
ns |
- number
- Is an expression that can be resolved to an intthat is added to a datepart of date. User-defined variables are valid.
If you specify a value with a decimal fraction, the fraction is truncated and not rounded.
- date
- Is an expression that can be resolved to a time, date, smalldatetime, datetime, datetime2, or datetimeoffset value. date can be an expression, column expression, user-defined variable, or string literal. If the expression is a string literal, it must resolve to a datetime. To avoid ambiguity, use four-digit years. For information about two-digit years, seetwo digit year cutoff Option.
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Return Types
The return data type is the data type of the date argument, except for string literals.
The return data type for a string literal is datetime. An error will be raised if the string literal seconds scale is more than three positions (.nnn) or contains the time zone offset part.
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Return Value
datepart Argument
dayofyear, day, and weekday return the same value.
Each datepart and its abbreviations return the same value.
If datepart is month and the date month has more days than the return month and the date day does not exist in the return month, the last day of the return month is returned. For example, September has 30 days; therefore, the two following statements return 2006-09-30 00:00:00.000:
SELECT DATEADD(month, 1, '2006-08-30')
SELECT DATEADD(month, 1, '2006-08-31')
number Argument
The
number argument cannot exceed the range of
int. In the following statements, the argument for
number exceeds the range of
int by 1. The following error message is returned: "Arithmetic overflow error converting expression to data type int."
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SELECT DATEADD(year,2147483648, '2006-07-31');
SELECT DATEADD(year,-2147483649, '2006-07-31');
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date Argument
The
date argument cannot be incremented to a value outside the range of its data type. In the following statements, the
number value that is added to the
date value exceeds the range of the
date data type. The following error message is returned: "Adding a value to a 'datetime' column caused overflow."
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SELECT DATEADD(year,2147483647, '2006-07-31');
SELECT DATEADD(year,-2147483647, '2006-07-31');
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Return Values for a smalldatetime date and a second or Fractional Seconds datepart
The seconds part of a smalldatetimevalue is always 00. If
date is
smalldatetime, the following apply:
- If datepart is second and number is between -30 and +29, no addition is performed.
- If datepart is second and number is less than-30 or more than +29, addition is performed beginning at one minute.
- If datepart is millisecond and number is between -30001 and +29998, no addition is performed.
- If datepart is millisecond and number is less than -30001 or more than +29998, addition is performed beginning at one minute.
Remarks
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Examples
A. Incrementing datepart by an interval of 1
Each of the following statements increments
datepart by an interval of 1.
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DECLARE @datetime2 datetime2 = '2007-01-01 13:10:10.1111111'
SELECT 'year', DATEADD(year,1,@datetime2)
UNION ALL
SELECT 'quarter',DATEADD(quarter,1,@datetime2)
UNION ALL
SELECT 'month',DATEADD(month,1,@datetime2)
UNION ALL
SELECT 'dayofyear',DATEADD(dayofyear,1,@datetime2)
UNION ALL
SELECT 'day',DATEADD(day,1,@datetime2)
UNION ALL
SELECT 'week',DATEADD(week,1,@datetime2)
UNION ALL
SELECT 'weekday',DATEADD(weekday,1,@datetime2)
UNION ALL
SELECT 'hour',DATEADD(hour,1,@datetime2)
UNION ALL
SELECT 'minute',DATEADD(minute,1,@datetime2)
UNION ALL
SELECT 'second',DATEADD(second,1,@datetime2)
UNION ALL
SELECT 'millisecond',DATEADD(millisecond,1,@datetime2)
UNION ALL
SELECT 'microsecond',DATEADD(microsecond,1,@datetime2)
UNION ALL
SELECT 'nanosecond',DATEADD(nanosecond,1,@datetime2);
/*
Year 2008-01-01 13:10:10.1111111
quarter 2007-04-01 13:10:10.1111111
month 2007-02-01 13:10:10.1111111
dayofyear 2007-01-02 13:10:10.1111111
day 2007-01-02 13:10:10.1111111
week 2007-01-08 13:10:10.1111111
weekday 2007-01-02 13:10:10.1111111
hour 2007-01-01 14:10:10.1111111
minute 2007-01-01 13:11:10.1111111
second 2007-01-01 13:10:11.1111111
millisecond 2007-01-01 13:10:10.1121111
microsecond 2007-01-01 13:10:10.1111121
nanosecond 2007-01-01 13:10:10.1111111
*/
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B. Incrementing more than one level of datepart in one statement
Each of the following statements increments
datepart by a
number large enough to also increment the next higher
datepart of
date.
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DECLARE @datetime2 datetime2;
SET @datetime2 = '2007-01-01 01:01:01.1111111';
--Statement Result
-------------------------------------------------------------------
SELECT DATEADD(quarter,4,@datetime2); --2008-01-01 01:01:01.110
SELECT DATEADD(month,13,@datetime2); --2008-02-01 01:01:01.110
SELECT DATEADD(dayofyear,365,@datetime2); --2008-01-01 01:01:01.110
SELECT DATEADD(day,365,@datetime2); --2008-01-01 01:01:01.110
SELECT DATEADD(week,5,@datetime2); --2007-02-05 01:01:01.110
SELECT DATEADD(weekday,31,@datetime2); --2007-02-01 01:01:01.110
SELECT DATEADD(hour,23,@datetime2); --2007-01-02 00:01:01.110
SELECT DATEADD(minute,59,@datetime2); --2007-01-01 02:00:01.110
SELECT DATEADD(second,59,@datetime2); --2007-01-01 01:02:00.110
SELECT DATEADD(millisecond,1,@datetime2); --2007-01-01 01:01:01.110
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C. Using expressions as arguments for the number and date parameters
The following examples use different types of expressions as arguments for the
number and
date parameters.
Specifying column as date
The following example adds
2 days to each
OrderDate to calculate a new
PromisedShipDate.
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USE AdventureWorks2008R2;
GO
SELECT SalesOrderID
,OrderDate
,DATEADD(day,2,OrderDate) AS PromisedShipDate
FROM Sales.SalesOrderHeader;
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Specifying user-defined variables as number and date
The following example specifies user-defined variables as arguments for
number and
date.
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DECLARE @days int;
DECLARE @datetime datetime;
SET @days = 365;
SET @datetime = '2000-01-01 01:01:01.111'; /* 2000 was a leap year */
SELECT DATEADD(day, @days, @datetime);
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Specifying scalar system function as date
The following example specifies
SYSDATETIME for
date.
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SELECT DATEADD(month, 1, SYSDATETIME());
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Specifying scalar subqueries and scalar functions as number and date
The following example uses scalar subqueries and scalar functions,
MAX(ModifiedDate), as arguments for
number and
date.
(SELECT TOP 1 BusinessEntityID FROM Person.Person) is an artificial argument for the number parameter to show how to select a
number argument from a value list.
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USE AdventureWorks2008R2;
GO
SELECT DATEADD(month,(SELECT TOP 1 BusinessEntityID FROM Person.Person),
(SELECT MAX(ModifiedDate) FROM Person.Person));
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Specifying constants as number and date
The following example uses numeric and character constants as arguments for number and date.
SELECT DATEADD(minute, 1, ' 2007-05-07 09:53:01.0376635');
Specifying numeric expressions and scalar system functions as number and date
The following example uses a numeric expressions (-
(10/2)), unary operators (
-), an arithmetic operator (
/), and scalar system functions (
SYSDATETIME) as arguments for
number and
date.
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SELECT DATEADD(month,-(10/2), SYSDATETIME());
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Specifying ranking functions as number
The following example uses a ranking function as arguments for
number.
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USE AdventureWorks2008R2;
GO
SELECT p.FirstName, p.LastName
,DATEADD(day,ROW_NUMBER() OVER (ORDER BY
a.PostalCode),SYSDATETIME()) AS 'Row Number'
FROM Sales.SalesPerson AS s
INNER JOIN Person.Person AS p
ON s.BusinessEntityID = p.BusinessEntityID
INNER JOIN Person.Address AS a
ON a.AddressID = p.BusinessEntityID
WHERE TerritoryID IS NOT NULL
AND SalesYTD <> 0;
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Specifying an aggregate window function as number
The following example uses an aggregate window function as an argument for number.