SQL Server Cannot Call Methods on Date

Question

I\'ve got a DATETIME column in a SQL Server 2008 table called ShiftDate. I want to convert this to a DATE column in a query:

SELECT     ID, ScheduleID, Shift         


        

Answer 1

You can create a function and use that when you need to convert a DATETIME to DATE.

USE [MyDatabaseName]
GO

IF EXISTS (
  SELECT * 
    FROM sys.objects 
   WHERE object_id = OBJECT_ID(N'[dbo].[FN_DateFromDateTime]')
   and  type in (N'FN')
)
   DROP FUNCTION [dbo].[FN_DateFromDateTime]
GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:      Codestalker
-- Create date: Mar 17, 2017
-- Edited date: Mar 17, 2017
-- Description: Return Date from DateTime.
-- =============================================
CREATE FUNCTION [dbo].[FN_DateFromDateTime]
(
    -- Add the parameters for the function here
    @InputDateTime DateTime
)
RETURNS Date
AS
BEGIN
        DECLARE @ReturnDate Date
        Set @ReturnDate = CONVERT(DATE, @InputDateTime)  
        Return @ReturnDate
END   
GO

Then in your view call the function to convert your DATETIME.

SELECT DateTimeColumn, dbo.FN_DateFromDateTime(DateTimeColumn) AS ConvertedDateTime
FROM dbo.MyTable

You will not get the error message and it is reusable. (Tested in SQL Server 2012)

Answer 2

Sometimes this works...

CAST(CAST(YourDate AS char(10)) AS Datetime)

(Yes I know it is not Date, but it is one step closer)

In the same query, it worked in the outside select, but not inside the union all...

Don't ask why :P

Answer 3

I can assume that (ShiftDate AS DATE) should have a datetime format. If you try this:

CAST(CONVERT(DATE, ShiftDate) as Varchar)

Answer 4

This problem is still present in SSMS 18.4. I just sent it to Microsoft as an "idea", and since Microsoft's attention to every given bug report depends (only) on the social support of it, if you want it fixed, please go and vote for it at

https://feedback.azure.com/forums/908035-sql-server/suggestions/41135050-ssms-returns-error-on-valid-query-in-view-designer

Answer 5

This also happens when you mistakenly put the column multiple times after tablename.

Suppose TableName is Person and column is Age

and you have written in query like:

Person.Age.Age = 30

Hope my experience will help someone.