Question

I am unable to get all the rows created today. I have used multiple functions like getdate(), Cast, Convert, etc. but all in vain.

This is my basic query:

SELECT timeId
FROM table_roaster_time_table
WHERE (user_id = @user_id) AND (DATEDIFF(d, date, GETDATE()) = 0)

I want to get the timeId from the table table_roaster_time_table where userid will be provided and the date is today.

How do I do this?

Answer 1

In order to keep any chance of using an index on the [date] column (even if one doesn’t exist today, it may in the future), try:

AND [date] >= DATEADD(DAY, 0, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP))
AND [date] <  DATEADD(DAY, 1, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP));

If you’re using SQL Server 2008 or better, you can do something like this to shorten the code but still make use of an index on [date] if one exists:

AND CONVERT(DATE, [date]) = CONVERT(DATE, CURRENT_TIMESTAMP);

EDIT

Since you seem to be confused why 3/6/2012 is March 6th and not June 3rd, I might also suggest that instead of manually inserting ambiguous date literals like '3/6/2012' into the database, you make the column a default such as:

ALTER TABLE dbo.table_roaster_time_table
  ALTER COLUMN [date] DATETIME NOT NULL;

ALTER TABLE dbo.table_roaster_time_table
  ADD CONSTRAINT df_date DEFAULT (CURRENT_TIMESTAMP)
  FOR [date];

If you’re going to insert date literals then at least use a safe and unambiguous format, such as YYYYMMDD:

INSERT dbo.table_roaster_time_table([date]) VALUES('20120603');

Now there is no confusion.