DATEDIFF AND DATEADD FUNCTION

SQL DATEDIFF Function

Returns the number of date and time boundaries crossed between two dates

SQL DATEDIFF Syntax
DATEDIFF ( DatePart , StartDate , EndDate )

DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-05'

SELECT DATEDIFF(Year, @StartDate, @EndDate) AS NewDate
Output = 0 Year


SELECT DATEDIFF(quarter, @StartDate, @EndDate) AS NewDate
Output = 1 quarter


SELECT DATEDIFF(Month, @StartDate, @EndDate) AS NewDate
Output = 2 Month


SELECT DATEDIFF(dayofyear,@StartDate, @EndDate) AS NewDate
Output = 61 day


SELECT DATEDIFF(Day, @StartDate, @EndDate) AS NewDate
Output = 61 Day


SELECT DATEDIFF(Week, @StartDate, @EndDate) AS NewDate
Output = 9 Week


SELECT DATEDIFF(Hour, @StartDate, @EndDate) AS NewDate
Output = 1464 Hour


SELECT DATEDIFF(minute, @StartDate, @EndDate) AS NewDate
Output = 87840 minute


SELECT DATEDIFF(second, @StartDate, @EndDate) AS NewDate
Output = 5270400 second


DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-06-06'

SELECT DATEDIFF(millisecond, @StartDate, @EndDate) AS NewDate
Output = 86400000 millisecond

SQL DATEDIFF Function
SqlTutorials

Posted by Emil Chang at 6:18 AM 15 comments  

Labels: SQL DateADD and DateDiff, SQL Dynamic Get Last and First Day

Monday, June 4, 2007

SQL DATEADD Function

Returns a new datetime value based on adding an interval to the specified date.

SQL DATEADD Syntax
DATEADD ( datepart , number, date )


DECLARE @DateNow DATETIME
SET @DateNow='2007-06-04'
SELECT DATEADD(Year, 3, @DateNow) AS NewDate
Output = 2010-06-04 00:00:00.000


SELECT DATEADD(quarter, 3, @DateNow) AS NewDate
Output = 2008-03-04 00:00:00.000


SELECT DATEADD(Month, 3, @DateNow) AS NewDate
Output = 2007-09-04 00:00:00.000


SELECT DATEADD(dayofyear,3, @DateNow) AS NewDate
Output = 2007-06-07 00:00:00.000


SELECT DATEADD(Day, 3, @DateNow) AS NewDate
Output = 2007-06-07 00:00:00.000


SELECT DATEADD(Week, 3, @DateNow) AS NewDate
Output = 2007-06-25 00:00:00.000


SELECT DATEADD(Hour, 3, @DateNow) AS NewDate
Output = 2007-06-04 03:00:00.000


SELECT DATEADD(minute, 3, @DateNow) AS NewDate
Output = 2007-06-04 00:03:00.000


SELECT DATEADD(second, 3, @DateNow) AS NewDate
Output = 2007-06-04 00:00:03.000


SELECT DATEADD(millisecond, 3, @DateNow) AS NewDate
Output = 2007-06-04 00:00:00.003

 

DATE FORMAT CONVERTION

DATE FORMAT CONVERTION

SQL CAST and CONVERT

It converts an expression from one data type to another.
CAST and CONVERT have similar functionality.

SQL CAST and CONVERT Syntax
Using CAST:
CAST ( expression AS data_type )

Using CONVERT:
CONVERT ( data_type [ ( length ) ] , expression [ , style ] )

Example of SQL Cast and Convert

SQL Cast and Convert - String
SELECT SUBSTRING('CAST and CONVERT', 1, 3)
Return Value = CAS (it get from index 1 to 3)

SELECT CAST('CAST and CONVERT' AS char(3))
Return Value = CAS (it get 3 char only)


SQL Cast and Convert - Date Time
-Converting date time to character data(vachar)
-The default values (style 0 or 100, 9 or 109, 13 or 113, 20 or 120, and 21 or 121) always return the Without century year(yy).
-Add 100 to a style value to get a four-place year that includes the century year(yyyy).
-Below is example for converting 1 format of date time to different format of date time, so that it can be use in various condition.

Value of current Date Time GETDATE()
SELECT (GETDATE()) = 2007-06-06 23:41:10.153


SELECT CONVERT(varchar,GETDATE(),0)
Return Value = Jun 6 2007 11:07PM
SELECT CONVERT(varchar,GETDATE(),100)
Return Value = Jun 6 2007 11:07PM


SELECT CONVERT(varchar,GETDATE(),1)
Return Value = 06/06/07
SELECT CONVERT(varchar,GETDATE(),101)
Return Value = 06/06/2007


SELECT CONVERT(varchar,GETDATE(),2)
Return Value = 07.06.06
SELECT CONVERT(varchar,GETDATE(),102)
Return Value = 2007.06.06


SELECT CONVERT(varchar,GETDATE(),3)
Return Value = 06/06/07
SELECT CONVERT(varchar,GETDATE(),103)
Return Value = 06/06/2007


SELECT CONVERT(varchar,GETDATE(),4)
Return Value = 06.06.07
SELECT CONVERT(varchar,GETDATE(),104)
Return Value = 06.06.2007


SELECT CONVERT(varchar,GETDATE(),5)
Return Value = 06-06-07
SELECT CONVERT(varchar,GETDATE(),105)
Return Value = 06-06-2007


SELECT CONVERT(varchar,GETDATE(),6)
Return Value = 06 Jun 07
SELECT CONVERT(varchar,GETDATE(),106)
Return Value = 06 Jun 2007


SELECT CONVERT(varchar,GETDATE(),7)
Return Value = Jun 06, 07
SELECT CONVERT(varchar,GETDATE(),107)
Return Value = Jun 06, 2007


SELECT CONVERT(varchar,GETDATE(),8)
Return Value = 23:38:49
SELECT CONVERT(varchar,GETDATE(),108)
Return Value = 23:38:49


SELECT CONVERT(varchar,GETDATE(),9)
Return Value = Jun 6 2007 11:39:17:060PM
SELECT CONVERT(varchar,GETDATE(),109)
Return Value = Jun 6 2007 11:39:17:060PM


SELECT CONVERT(varchar,GETDATE(),10)
Return Value = 06-06-07
SELECT CONVERT(varchar,GETDATE(),110)
Return Value = 06-06-2007


SELECT CONVERT(varchar,GETDATE(),11)
Return Value = 07/06/06
SELECT CONVERT(varchar,GETDATE(),111)
Return Value = 2007/06/06


SELECT CONVERT(varchar,GETDATE(),12)
Return Value = 070606
SELECT CONVERT(varchar,GETDATE(),112)
Return Value = 20070606


SELECT CONVERT(varchar,GETDATE(),13)
Return Value = 06 Jun 2007 23:40:14:577
SELECT CONVERT(varchar,GETDATE(),113)
Return Value = 06 Jun 2007 23:40:14:577


SELECT CONVERT(varchar,GETDATE(),14)
Return Value = 23:40:29:717
SELECT CONVERT(varchar,GETDATE(),114)
Return Value = 23:40:29:717


SELECT CONVERT(varchar,GETDATE(),20)
Return Value = 2007-06-06 23:40:51
SELECT CONVERT(varchar,GETDATE(),120)
Return Value = 2007-06-06 23:40:51


SELECT CONVERT(varchar,GETDATE(),21)
Return Value = 2007-06-06 23:41:10.153
SELECT CONVERT(varchar,GETDATE(),121)
Return Value = 2007-06-06 23:41:10.153


SELECT CONVERT(varchar,GETDATE(),126)
Return Value = 2007-06-06T23:41:10.153


SELECT CONVERT(varchar,GETDATE(),131)
Return Value = 21/05/1428 11:41:10:153PM

 

DBCC COMMANDS 2005

List of DBCC in SQL SERVER 2005

DBCC stands for database consistency checker. We use these commands to check the consistency of the databases.
Example, maintenance, validation task and status checks.

DBCC CHECKALLOC - Check consistency of disk allocation.
DBCC CHECKCATALOG - Check catalog consistency
DBCC CHECKCONSTRAINTS - Check integrity of table constraints.
DBCC CHECKDB - Check allocation, and integrity of all objects.
DBCC CHECKFILEGROUP - Check all tables and indexed views in a filegroup.
DBCC CHECKIDENT - Check identity value for a table.
DBCC CHECKTABLE - Check integrity of a table or indexed view.
DBCC CLEANTABLE - Reclaim space from dropped variable-length columns.
DBCC dllname - Unload a DLL from memory.
DBCC DROPCLEANBUFFERS - Remove all clean buffers from the buffer pool.
DBCC HELP - Help for DBCC commands.
DBCC INPUTBUFFER - Display last statement sent from a client to a database instance.
DBCC OPENTRAN - Display information about recent transactions.
DBCC OUTPUTBUFFER - Display last statement sent from a client to a database instance.
DBCC PROCCACHE - Display information about the procedure cache
DBCC SHOW_STATISTICS - Display the current distribution statistics
DBCC SHRINKDATABASE - Shrink the size of the database data and log files.
DBCC SHRINKFILE - Shrink or empty a database data or log file.
DBCC SQLPERF - Display transaction-log space statistics. Reset wait and latch statistics.
DBCC TRACE - Enable or Disable trace flags
DBCC UPDATEUSAGE - Report and correct page and row count inaccuracies in catalog views
DBCC USEROPTIONS - Return the SET options currently active
DBCC deprecated commands