Date wise optional parameter searching in SQL Stored Procedure - sql

Question

I want to take a leave report from my leave application table when I search. In the table I have Leavefrom(datetime), LeaveTo(datetime) columns. Now I want to take the rows on the basis of these two columns. My searching parameters are nullable they are
#employeeid, #datefrom, #dateto.
I need to get the result must between the date of Leavefrom, LeaveTo.
I am trying to make a stored procedure for this.
ALTER PROCEDURE [dbo].[SP_GetSpecificLeaveReport]
#empid int=null,
#leavefrom date=null,
#leaveto date=null
AS
BEGIN
SET NOCOUNT ON;
SELECT ela.appliedDate,ela.appliedBy,ela.leaveFrom,ela.leaveTo,ela.noOfDays,
ejd.firstName,ejd.lastName,
ltm.leaveType
from dbo.tblEmployeeLeaveApplication as ela inner join dbo.tblEmployeeJobDetails as
ejd on ela.empId=ejd.recordId inner join dbo.tblLeaveTypeMaster as ltm
on ela.leaveTypeId=ltm.record_Id where
END

Answer 1

This kind of queries are called catch-all queries.
There are multiple ways to do this, using iif like in Mukesh's answer is one of them, but will only work on sql server 2012 or higher.
I would recommend working with a slighly longer where clause for better performance as well as compatibility (this should work with any version, even sql server 7):
where (#empid is null or ela.empId = #empid)
and (#leavefrom is null or (
ltm.leavedatefrom >= #leavefrom
and ltm.leavedatefrom < dateadd(day, 1, #leavefrom)
)
and (#leaveto is null or (
ltm.leavedateto >= #leaveto
and ltm.leavedateto < dateadd(day, 1, #leaveto))
Note: Since your database columns are of type datetime but your parameters are of type date, I've the >=...or condition to catch all datetime values that match a specific date.
Also, you might need to cast from date to datetime.
Also, you should be aware of the fact that using catch-all queries might suffer from poor performance due to query-plan cashing.
If you do encounter a performance problem you might want to add a recompile hint to your query so that each time you execute the stored procedure you will have the optimal query plan. read this article for more details.

Answer 2

try this query to add
where ela.empId=IFNULL(ela.empId,ela.empId)
and ltm.leavedatefrom>=IFNULL(#leavefrom,ltm.leavedatefrom)
and ltm.leavedateto<=IFNULL(#leaveto,ltm.leavedateto)

Answer 3

Try following,
ALTER PROCEDURE [dbo].[SP_GetSpecificLeaveReport]
#empid int=null,
#leavefrom date=null,
#leaveto date=null
AS
BEGIN
SET NOCOUNT ON;
SELECT
ela.appliedDate,ela.appliedBy,ela.leaveFrom,ela.leaveTo,ela.noOfDays,
ejd.firstName,ejd.lastName,
ltm.leaveType
from dbo.tblEmployeeLeaveApplication as ela
inner join dbo.tblEmployeeJobDetails as ejd on ela.empId=ejd.recordId
inner join dbo.tblLeaveTypeMaster as ltm on ela.leaveTypeId=ltm.record_Id
where
1 = case when Isnull(#empid,0) == 0 then
case when ela.empId == #empid then 1 else 0 end
else 0 end
And case when isnull(#leavefrom,'1900-01-01') == '1900-01-01' then
case when ela.leaveFrom >= #leavefrom then 1 else 0 end
else 0 end
And case when isnull(#leavefrom,'1900-01-01') == '1900-01-01' then
case when ela.leaveto <= #leaveto then 1 else 0 end
else 0 end
END