Sql DateDifference function

Question

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SQL-Server-2008

SQL

SELECT convert(varchar,DATEADD(wk,DATEDIFF(wk,0,GETDATE()),0),103)

In this query give the first day of current week . I have doubt about how the datediff() funtion works in this query . DateDiff() function returns some integer value.

Explain how the datediff() function works in this query........

Posted 5-Oct-12 1:47am

sangeethamanikandan

Updated 5-Oct-12 2:05am

Sandeep Mewara

v2

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Sandeep Mewara · Accepted Answer · 2012-10-05T02:08:00

Solution 1

Here, read about DATEDIFF: MSDN: DATEDIFF (Transact-SQL)[^]

& read about DATEADD: MSDN: DATEADD (Transact-SQL)[^]

Syntax expected:

SQL

DATEADD (datepart, number, date)
DATEDIFF (datepart, startdate, enddate)

I will let you figure out the rest.

Posted 5-Oct-12 2:08am

Sandeep Mewara

Comments

Abhinav S 5-Oct-12 8:11am

5!

Sandeep Mewara 5-Oct-12 8:19am

Thanks. :)

Santhosh Kumar Jayaraman · Accepted Answer · 2012-10-05T02:11:00

Solution 2

SQL

DATEDIFF(wk,0,GETDATE())

this will give you the difference between current date and 1/1/1900 in weeks(wk stands for week difference)

so for today's date(oct 5, 2012) the difference is 5883 weeks .

Now when you say

SQL

DATEADD(wk,DATEDIFF(wk,0,GETDATE()),0)

this will add the weeks to date 1/1/1900 and the out put will be start date of the week 5883 i.e. '2012-10-01'

and finally when you do a convert of 103, it will display output as '01/10/2012'

Posted 5-Oct-12 2:11am

Santhosh Kumar Jayaraman

Updated 5-Oct-12 2:12am

v2

Comments

ridoy 5-Oct-12 11:24am

good explanation..+5

sangeethamanikandan 6-Oct-12 0:20am

Super explanation.... I realy impressed your answer.. Now i am cleard and i have the lot ideas..............