SQLServer查询一天时间内的数据

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

Syntax

DATEADD (datepart , number , date )

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.

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.

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');

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');

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

DATEADD can be used in the SELECT <list>, WHERE, HAVING, GROUP BY and ORDER BY clauses.

Fractional Seconds Precision

Addition for a datepart of microsecond or nanosecond for date data types smalldatetime, date, and datetime is not allowed. Milliseconds have a scale of 3 (.123). microseconds have a scale of 6 (.123456). nanoseconds have a scale of 9 (.123456789). The time, datetime2, and datetimeoffset data types have a maximum scale of 7 (.1234567). If datepart is nanosecond, number must be 100 before the fractional seconds of date increase. A number between 1 and 49 is rounded down to 0 and a number from 50 to 99 is rounded up to 100. The following statements add a datepart of millisecond, microsecond, or nanosecond.

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DECLARE @datetime2 datetime2 = '2007-01-01 13:10:10.1111111' SELECT '1 millisecond' ,DATEADD(millisecond,1,@datetime2) UNION ALL SELECT '2 milliseconds', DATEADD(millisecond,2,@datetime2) UNION ALL SELECT '1 microsecond', DATEADD(microsecond,1,@datetime2) UNION ALL SELECT '2 microseconds', DATEADD(microsecond,2,@datetime2) UNION ALL SELECT '49 nanoseconds', DATEADD(nanosecond,49,@datetime2) UNION ALL SELECT '50 nanoseconds', DATEADD(nanosecond,50,@datetime2) UNION ALL SELECT '150 nanoseconds', DATEADD(nanosecond,150,@datetime2); /* Returns: 1 millisecond 2007-01-01 13:10:10.1121111 2 milliseconds 2007-01-01 13:10:10.1131111 1 microsecond 2007-01-01 13:10:10.1111121 2 microseconds 2007-01-01 13:10:10.1111131 49 nanoseconds 2007-01-01 13:10:10.1111111 50 nanoseconds 2007-01-01 13:10:10.1111112 150 nanoseconds 2007-01-01 13:10:10.1111113 */

Time Zone Offset

Addition is not allowed for time zone offset.

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 */

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

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;

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);

Specifying scalar system function as date

The following example specifies SYSDATETIME for date.

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SELECT DATEADD(month, 1, SYSDATETIME());

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));

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());

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;

Specifying an aggregate window function as number

The following example uses an aggregate window function as an argument for number.