How to make ledger query using SELECT statement in SQL - sql

Question

DECLARE #AccountId int = 1152;
DECLARE #StartDate datetime = '10/1/2019';
DECLARE #EndDate datetime = '1/25/2020';
DECLARE #PreBalance int = (SELECT ISNULL(SUM(Debit), 0) - ISNULL(SUM(Credit), 0)
FROM GL_Voucher m
INNER JOIN GL_Voucher_Item_Type d ON m.Id = d.GL_Voucher_Id
WHERE m.Date < #StartDate
AND d.L5_Id = #AccountId)
SELECT d.Date, d.debit AS Debit, d.Credit, #PreBalance AS Opening
FROM GL_Voucher_Item_Type d
INNER JOIN GL_Voucher m ON d.GL_Voucher_Id = m.Id
INNER JOIN Level5 a ON d.L5_Id = a.Id
INNER JOIN Level4 l4 ON a.L4_Id = l4.Id
INNER JOIN Level3 l3 ON l4.L3_id = l3.Id
INNER JOIN Level2 l2 ON l3.L2_id = l2.Id
INNER JOIN Level1 l1 ON l2.L1_id = l1.Id
WHERE m.Date BETWEEN #StartDate AND #EndDate
AND d.L5_Id = #AccountId
ORDER BY Date ASC
This is the output of query
I want to show balance column initially as Balance=#Prebalance tehn if credit then Balance=Balance-Credit and if debit then Balance=Balance+Debit

Answer 1

I'd calculate running totals of debits and credits using SUM OVER, then do the math.
This is untested, but should be pretty close to what you're looking for.
SELECT d.DATE
,d.debit AS Debit
,d.Credit
,#PreBalance
- SUM(d.debit) OVER (ORDER BY d.DATE) + SUM(d.Credit) OVER (ORDER BY d.DATE)
AS Opening
FROM GL_Voucher_Item_Type d
INNER JOIN GL_Voucher m ON d.GL_Voucher_Id = m.Id
INNER JOIN Level5 a ON d.L5_Id = a.Id
INNER JOIN Level4 l4 ON a.L4_Id = l4.Id
INNER JOIN Level3 l3 ON l4.L3_id = l3.Id
INNER JOIN Level2 l2 ON l3.L2_id = l2.Id
INNER JOIN Level1 l1 ON l2.L1_id = l1.Id
WHERE m.DATE BETWEEN #StartDate
AND #EndDate
AND d.L5_Id = #AccountId
ORDER BY DATE ASC

Answer 2

Please try this:
select d.Date,#PreBalance as Balance,
case when d.Credit > 0 THEN #PreBalance - d.Credit
else debit+#PreBalance end as CreditOrDebitBalance
from GL_Voucher_Item_Type d
INNER JOIN GL_Voucher m ON d.GL_Voucher_Id=m.Id
INNER JOIN Level5 a ON d.L5_Id=a.Id
INNER JOIN Level4 l4 ON a.L4_Id=l4.Id
INNER JOIN Level3 l3 ON l4.L3_id=l3.Id
INNER JOIN Level2 l2 ON l3.L2_id=l2.Id
INNER JOIN Level1 l1 ON l2.L1_id=l1.Id
WHERE m.Date BETWEEN #StartDate AND #EndDate
AND d.L5_Id=#AccountId
ORDER BY Date ASC
Please show us expected output so we can help further.