How to make stored procedure in if..End if condition - sql

Question

I am beginner at stored procedures. I tried the following stored procedure in IF...End If condition so how to make it ... I am confused.... so anyone create it
strSql = "SELECT count(*) " & _
" FROM hist_billgen_report r, hist_billgen_header h " & _
" WHERE r.invoice_number=h.invoice_number " & _
" and h.macnum = '" & l_macnum & "' " & _
" and r.rep_type = 1 " & _
" and r.rep_call_type = '" & line_type & "' " & _
" and h.billing_job_id = '" & arg_job & "' "
'Special code for data lines for Newcore
If gcompany = "NCW" Then
strSql += " and r.rep_number not in ( "
strSql += "select distinct a.mdn from order_wireless a where"
strSql += " a.id in"
strSql += " ("
strSql += " select c.serviceid from cust_charge_file b, service_charges c, main_company_utilities d"
strSql += " where(b.chg_main_index = c.chargeid)"
strSql += " and c.serviceid = a.id"
strSql += " and (b.chg_main_category_id = d.utilities_id and d.utilities_type = 'CS' and (utilities_desc_short like '%FDS1%' or utilities_desc_short like '%FDS2%' or utilities_desc_short like '%FDS3%' or utilities_desc_short like '%MBS1%' or utilities_desc_short like '%MBS2%' or utilities_desc_short like '%MBS3%' ) )"
strSql += " )"
strSql += " and a.accountnumber = '" & l_macnum & "' "
strSql += " )"
End If

Answer 1

Putting a query into a stored procedure doesn't necessarily always mean a performance increase. Depending on the data in your tables, this query could be quite slow due to the OR LIKES '%%' in it, but you could do something like this:
create procedure [dbo].[spname]
#l_macNum int -- note, you haven't given a lot of information, create all query parameters with appropriate types here
-- more parameters
#arg_job int -- same
AS
BEGIN
if (#company = 'NCW')
begin
SELECT count(*)
FROM hist_billgen_report r, hist_billgen_header h
WHERE r.invoice_number=h.invoice_number
and h.macnum = #l_macNum
-- etc
and r.rep_number not in (
-- etc
)
end
else
begin
SELECT count(*)
FROM hist_billgen_report r, hist_billgen_header h
WHERE r.invoice_number=h.invoice_number
and h.macnum = #l_macNum
-- etc
end
END
GO
note the If and else logic are completely separate queries, as you cannot do what I think you were hoping to do in a contiguous query, without using dynamic sql. there are certain caveats to this but given you're new to sql, going to stick with that
I used -- etc as place holders for your text, as I'm not going to provide the entire solution :P
If that doesn't make sense, let me know.