Question

SQL Server 2000 compare date equality

Asked by: chintaps

Hi All,
    I am writing a SQL Server stored procedure. I would like to know how I can optimally find out the value in a datetime field is today.

Example:
select * from table where some_function(datetime_column)=some_function(getdate())

should return rows where datetime_column has values of today regardsless of the time.

Thanks.

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Asked On
2008-03-18 at 15:37:07ID23252040
Tags

microsoft

,

sql server

,

2000

,

sql server stored procedure

Topics

SQL Server 2005

,

Databases Miscellaneous

,

SQL Query Syntax

Participating Experts
5
Points
500
Comments
7

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Answers

 

by: aneeshattingalPosted on 2008-03-18 at 15:40:01ID: 21156812

select * from table
where urDateColumn >= CONVERT(varchar, getdate(),112)  
and urDateColumn <  CONVERT(varchar, getdate()+1,112)  

 

by: chapmandewPosted on 2008-03-18 at 15:42:20ID: 21156846

select * from tablename
where datefield >= CONVERT(varchar(10), getdate(),101)  
and datefield <  CONVERT(varchar(10), dateadd(dd,  1, getdate()),101)  

 

by: chintapsPosted on 2008-03-18 at 16:03:31ID: 21157034

Now both of these work but is there any reason why one is better than the other? I am not being picky but trying to learn.

Thanks.

 

by: chapmandewPosted on 2008-03-18 at 16:05:57ID: 21157054

They are about the same....the reason I use the dateadd is that it allows me to explictly add one day to the date, with the other option you can only add days....you have to use dateadd for other increments, such as hours, weeks, months, etc.  Make sense?

 

by: BriCrowePosted on 2008-03-18 at 16:09:44ID: 21157077

SELECT *
FROM table
WHERE CONVERT(varchar, datetime_column, 112) = CONVERT(varchar, GetDate(), 112)

 

by: ramasuaPosted on 2008-03-18 at 20:19:36ID: 21158234

Hi..  
I think a better solution is to use the DATEDIFF function.. This involves no data type conversions.

select * from table where DATEDIFF(DayOfYear, DateColumnName, GETDATE()) = 0

Good Luck..
Anand

 

by: angelIIIPosted on 2008-03-18 at 23:43:29ID: 21158970

I would go with the 2 first suggestions, as those will be able to use an index on the column urDateColumn.

using some_function(datetime_column)=some_function(getdate()) (or using datediff()) will make that impossible.

20120131-EE-VQP-002

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