Question

My Question is,

I have a Column of type DateTime in SQL Table and it contains Values Like

2013-02-01 10:00:00.000
2013-01-27 16:00:00.000
2013-02-01 14:00:00.000

How can I get results with a Query if I only mention the Date in Where Clause like:

SELECT *
FROM   tablename
WHERE  columnName = '2013-02-01'

After executing this Query I want to have This Result

2013-02-01 10:00:00.000
2013-02-01 14:00:00.000

Kindly Help me in this.

Answer 1

Since your data is stored with times, you need to Cast those to just Dates.

Try this:

SELECT  * 
FROM tablename 
WHERE CAST(columnName as DATE) = '2013-02-01'

Depending on your SQL Server version (if it doesn’t support DATE data type), you can use this:

SELECT  * 
FROM tablename 
WHERE DATEADD(dd, 0, DATEDIFF(dd, 0, columnName)) = DATEADD(dd, 0, DATEDIFF(dd, 0, '2013-02-01'))

EDIT — As others have rightfully pointed out, you lose any performance gained from table indexing on that column in the above example. This should be what you’re looking for given a single input parameter (2013-01-01 in this case):

SELECT *
FROM tablename
WHERE columnName >= CONVERT(datetime,'2013-01-01')
  AND columnName < DATEADD(dd, 1, CONVERT(datetime,'2013-01-01'))

Good luck.