Procedure to check annual date - sql

Question

I'm trying to create a procedure to verify annual dates. The date is stored one time in the BD, but in the calendar on my winform it shows annually(I use annually bolded dates in C#). So what I want to do with the query, is to check is the month and the day are like the date stored in the table, but does not work. This is my query:
SELECT IdCalendar,
Description,
DateCalendar,
Annualy
FROM Calendar
WHERE
(DATEPART(MONTH,DateCalendar) like DATEPART(MONTH,#DateCalendar)) AND
(DATEPART(DAY,DateCalendar) like DATEPART(DAY,#DateCalendar))
And for example, my stored DateCalendar is '2015-12-04', and I my paramenter #DateCalendar is '2016-12-04'. Any idea about how to do a better query?
EDIT
The query does not have any error or warning. Just returns 0 rows. And my DateCalendar is stored as DateTime.
The SP:
CREATE PROC [dbo].[usp_app_Calendar_Search]
#DateCalendar DATETIME,
#Result SMALLINT OUTPUT,
#Message VARCHAR(1000) OUTPUT
AS
BEGIN
DECLARE #vResult SMALLINT, #vMessage VARCHAR(1000)
SELECT #vResult = 0, #vMessage = ''
BEGIN TRY
IF EXISTS (SELECT * FROM Calendar WHERE DateCalendar = #DateCalendar)
BEGIN
IF(#DateCalendar = 0) SET #DateCalendar = NULL
SELECT IdCalendar,
Description,
DateCalendar,
Annualy
FROM Calendar
WHERE
(DATEPART(MONTH,DateCalendar) like DATEPART(MONTH,#DateCalendar)) AND
(DATEPART(DAY,DateCalendar) like DATEPART(DAY,#DateCalendar))
SET #vResult = 1
SET #vMessage = 'Done'
END
ELSE BEGIN
SET #vResult = 0
SET #vMessage = 'Error.'
END
END TRY
BEGIN CATCH
SET #vResult = -1
SET #vMessage = 'Error: ' + ERROR_MESSAGE() + ' Line: ' + CAST(ERROR_LINE() AS VARCHAR)
END CATCH
SELECT #Result = #vResult, #Message = #vMessage
END
Thanks in advance.

Answer 1

The problem is with IF EXISTS (SELECT * FROM Calendar WHERE DateCalendar = #DateCalendar). I rewrite your SP:
CREATE PROC [dbo].[usp_app_Calendar_Search]
#DateCalendar DATETIME,
#Result SMALLINT OUTPUT,
#Message VARCHAR(1000) OUTPUT
AS
BEGIN
DECLARE #vResult SMALLINT = 0
,#vMessage VARCHAR(1000) = '';
IF(#DateCalendar = 0) SET #DateCalendar = NULL;
BEGIN TRY
SELECT IdCalendar,
Description,
DateCalendar,
Annualy
FROM Calendar
WHERE DATEPART(MONTH,DateCalendar) = DATEPART(MONTH,#DateCalendar)
AND DATEPART(DAY,DateCalendar) = DATEPART(DAY,#DateCalendar);
IF ##ROWCOUNT > 0
SELECT #vResult = 1, #vMessage = 'Done'
ELSE
SELECT #vResult = 0, #vMessage = 'Error.';
END TRY
BEGIN CATCH
SET #vResult = -1
SET #vMessage = 'Error: ' + ERROR_MESSAGE() + ' Line: '
+ CAST(ERROR_LINE() AS VARCHAR)
END CATCH
SELECT #Result = #vResult, #Message = #vMessage;
END
EDIT:
Now the WHERE condition is not-SARGable so it means that query optimizer will skip index on DateCalendar column (if exists any).
You can use computed columns like #Tom Page suggested in comment:
ALTER TABLE Calendar ADD MonthCalendar AS DATEPART(MONTH,DateCalendar);
ALTER TABLE Calendar ADD DayCalendar AS DATEPART(day,DateCalendar);
/*Create Index on Calculated Columns for Month and day*/
CREATE INDEX IX_Calendar_Month_Day ON Calendar(MonthCalendar , DayCalendar);
/*Use Computed Column Index in W*/
DECLARE #DateCalendar datetime = '2015-12-25';
SELECT IdCalendar, Description, DateCalendar, Annualy
FROM Calendar
WHERE MonthCalendar = DATEPART(MONTH,#DateCalendar)
AND DayCalendar = DATEPART(DAY,#DateCalenda);