Changing SQL Server query based on stored procedure parameter - sql

Question

I have a stored procedure which has a parameter #FilterToUse.
I have a query inside the stored procedure as shown below:
INSERT INTO #StatusCalculation
SELECT COUNT(*)
FROM Data
WHERE DataType = 'Bid'
--This part can change based on SP param
AND CreatedDate BETWEEN CONVERT(DATETIME, ('1/1' + '/' + #RequestYear))
AND CONVERT(DATETIME, ('12/31' + '/' + #RequestYear))
--end dynamic part
AND Services LIKE '%Streamline Payroll%'
AND Services LIKE '%GlobalView Payroll%'
So if I have a different filter I ll have to write
INSERT INTO #StatusCalculation
SELECT COUNT(*)
FROM Data
WHERE DataType = 'Bid'
--This part can change based on param
AND BidId BETWEEN 1 AND 10
--end dynamic part
AND Services LIKE '%Streamline Payroll%'
AND Services LIKE '%GlobalView Payroll%'
Now my issue is that based on the #FilterToUse parameter I might have to use a different query expression. The same query based on different options is used about 10 times. Is there a way that I can dynamically add the filter conditions to the query based on parameter without duplicating the whole query.
I was thinking if somehow I can do the below
declare #data nvarchar(max)
Set #data = 'and CreatedDate between convert(datetime,("1/1"+"/"+#RequestYear))
and convert(datetime,("12/31"+"/"+#RequestYear))'
and then just add that variable to the query
Insert into #BidStatusCalculation
select 'SL Payroll',Count(*) from DashboardData
where DataType = 'Bid'
#data

Answer 1

You need to use dinamic SQL for this purpose.
First define and assign the #DinamicPart but you may include this in the call to the SP and consider as a parameter.
DECLARE #DinamicPart AS NVARCHAR(MAX), -- This is the part that will be passed as parameter to the SP
#SQL AS NVARCHAR(MAX);
SET #DinamicPart = ' AND CreatedDate BETWEEN CONVERT(DATETIME, (''1/1/' + #RequestYear+'))
AND CONVERT(DATETIME, (''12/31/' + #RequestYear))';
SET #SQL = 'INSERT INTO #StatusCalculation
SELECT COUNT(*)
FROM Data
WHERE DataType = 'Bid'
--This part can change based on SP param ' +
#DinamicPart + '
--end dynamic part
AND Services LIKE ''%Streamline Payroll%''
AND Services LIKE ''%GlobalView Payroll%'';
-- This part if for debugging purposes as Dinamic SQL can be very tricky
PRINT #SQL;
-- And last part, you run the Dinamic SQL
EXEC SP_ExecuteSQL #SQL;

Answer 2

Proposed solution:
insert into #StatusCalculation
select COUNT(*)
from Data
where DataType = 'Bid'
--This part can change based on param
and 1 = (
case #FilterToUse
when 1 then
case when year(CreateDate) = #RequestYear then 1 else 0 end
when 2 then
case when BidId between 1 and 10 then 1 else 0 end
end
)
--end dynamic part
and Services like '%Streamline Payroll%'
and Services like '%GlobalView Payroll%'