The SQL Server query is taking too long to load the data - sql

Question

The below query is actually a view which is being used to display the cash payment report. But it is taking too much of time to load the data
SELECT
Billing_AccountPaymentDate.DueDate,
SUM(Billing_AccountCharge.NetAmount) AS NetCharges,
ISNULL(SUM(AccountChargePayment.SchoolPayments + AccountChargePayment.SchoolRemittances + AccountChargePayment.SchoolRemittancesPending), 0) / SUM(Billing_AccountCharge.NetAmount) AS PercentCollected,
SUM(Billing_AccountCharge.NetAmount - ISNULL(AccountChargePayment.SchoolPayments + AccountChargePayment.SchoolRemittances + AccountChargePayment.SchoolRemittancesPending, 0)) AS RemainingBalance,
Billing_AccountPaymentDate.RemittanceEffectiveDate,
Billing_Account.SchoolId,
ISNULL(SUM(AccountChargePayment.SchoolPayments), 0) AS SchoolPayments,
ISNULL(SUM(AccountChargePayment.SchoolRemittances), 0) AS SchoolRemittances,
ISNULL(SUM(AccountChargePayment.SchoolRemittancesPending), 0) AS SchoolRemittancesPending,
Billing_Account.SchoolYearId,
ISNULL(SUM(AccountChargePayment.SchoolPayments + AccountChargePayment.SchoolRemittances), 0) AS TotalReceipts
FROM
Billing_AccountCharge
INNER JOIN
Billing_AccountInvoice ON
Billing_AccountInvoice.AccountInvoiceId = Billing_AccountCharge.AccountInvoiceId
INNER JOIN
Billing_Account ON
Billing_Account.AccountId = Billing_AccountInvoice.AccountId
INNER JOIN
Billing_PaymentMethod ON
Billing_PaymentMethod.PaymentMethodId = CASE WHEN Billing_AccountInvoice.AutomaticPaymentEligible = 1 THEN Billing_Account.PaymentMethodId ELSE 3 END -- Send Statements
INNER JOIN
Billing_AccountPaymentDate ON
Billing_AccountPaymentDate.AccountPaymentMethodId = Billing_PaymentMethod.AnticipatedAccountPaymentMethodId AND
Billing_AccountPaymentDate.DueDate = Billing_AccountInvoice.DueDate AND
Billing_AccountPaymentDate.HoldForFee = Billing_Account.HoldPaymentForFee
INNER JOIN
Billing_ChargeItem ON
Billing_ChargeItem.ChargeItemId = Billing_AccountCharge.ChargeItemId
LEFT OUTER JOIN
(
SELECT
Billing_AccountChargePayment.AccountChargeId,
SUM(CASE WHEN Billing_AccountPayment.AccountPaymentTypeId = 9 THEN Billing_AccountChargePayment.Amount ELSE 0 END) AS SchoolPayments,
SUM(CASE WHEN Billing_AccountChargePayment.SchoolRemittanceId IS NOT NULL THEN Billing_AccountChargePayment.Amount ELSE 0 END) AS SchoolRemittances,
SUM(CASE WHEN Billing_AccountChargePayment.SchoolRemittanceId IS NULL AND Billing_AccountPayment.AccountPaymentTypeId <> 9 THEN Billing_AccountChargePayment.Amount ELSE 0 END) AS SchoolRemittancesPending
FROM
Billing_AccountChargePayment
INNER JOIN
Billing_AccountPayment ON
Billing_AccountPayment.AccountPaymentId = Billing_AccountChargePayment.AccountPaymentId
GROUP BY
Billing_AccountChargePayment.AccountChargeId
) AccountChargePayment ON
AccountChargePayment.AccountChargeId = Billing_AccountCharge.AccountChargeId
WHERE
Billing_AccountInvoice.AccountInvoiceStatusId <> 4 AND -- Voided
Billing_ChargeItem.RemitToSchool = 1
AND Billing_Account.[SchoolId] = 6 --hard code in a school with data
AND Billing_Account.[SchoolYearId] = 12 --hard code in a school year with data
GROUP BY
Billing_AccountPaymentDate.DueDate,
Billing_AccountPaymentDate.RemittanceEffectiveDate,
Billing_Account.SchoolId,
Billing_Account.SchoolYearId
HAVING
SUM(Billing_AccountCharge.NetAmount) <> 0
order by Billing_AccountPaymentDate.DueDate ASC
It looks like the inner query in the left join is taking too much of time, both the tables already have non clustered index, I tried taking those tables outside but the data is not accurate

Answer 1

Use CTE instead of subquery and do all calculation there instead of in Left outer join. Moreover, use with(nolock) whenever you fetch data. Still your query is taking much more time then You should implement proper indexing.
WITH PaymentData AS (
SELECT
acp.AccountChargeId,
SUM(
CASE
WHEN ap.AccountPaymentTypeId = 9 THEN acp.Amount
ELSE 0
END
) AS SchoolPayments,
SUM(
CASE
WHEN acp.SchoolRemittanceId IS NOT NULL THEN acp.Amount
ELSE 0
END
) AS SchoolRemittances,
SUM(
CASE
WHEN acp.SchoolRemittanceId IS NULL AND ap.AccountPaymentTypeId <> 9 THEN acp.Amount
ELSE 0
END
) AS SchoolRemittancesPending
FROM
Billing_AccountChargePayment acp WITH(NOLOCK)
INNER JOIN Billing_AccountPayment ap WITH(NOLOCK) ON acp.AccountPaymentId = ap.AccountPaymentId
GROUP BY
acp.AccountChargeId
)
SELECT
apd.DueDate,
SUM(ac.NetAmount) AS NetCharges,
COALESCE(
SUM(pd.SchoolPayments + pd.SchoolRemittances + pd.SchoolRemittancesPending),
0
) / SUM(ac.NetAmount) AS PercentCollected,
SUM(ac.NetAmount - COALESCE(pd.SchoolPayments, 0) - COALESCE(pd.SchoolRemittances, 0) - COALESCE(pd.SchoolRemittancesPending, 0)) AS RemainingBalance,
apd.RemittanceEffectiveDate,
a.SchoolId,
COALESCE(SUM(pd.SchoolPayments), 0) AS SchoolPayments,
COALESCE(SUM(pd.SchoolRemittances), 0) AS SchoolRemittances,
COALESCE(SUM(pd.SchoolRemittancesPending), 0) AS SchoolRemittancesPending,
a.SchoolYearId,
COALESCE(SUM(pd.SchoolPayments + pd.SchoolRemittances), 0) AS TotalReceipts
FROM
Billing_AccountCharge ac WITH(NOLOCK)
INNER JOIN Billing_AccountInvoice ai WITH(NOLOCK) ON ac.AccountInvoiceId = ai.AccountInvoiceId
INNER JOIN Billing_Account a WITH(NOLOCK) ON ai.AccountId = a.AccountId
INNER JOIN Billing_PaymentMethod pm WITH(NOLOCK) ON pm.PaymentMethodId = CASE
WHEN ai.AutomaticPaymentEligible = 1 THEN a.PaymentMethodId
ELSE 3
END
INNER JOIN Billing_AccountPaymentDate apd WITH(NOLOCK) ON
apd.AccountPaymentMethodId = pm.AnticipatedAccountPaymentMethodId AND
apd.DueDate = ai.DueDate AND
apd.HoldForFee = a.HoldPaymentForFee
INNER JOIN Billing_ChargeItem ci WITH(NOLOCK) ON ac.ChargeItemId = ci.ChargeItemId
LEFT OUTER JOIN PaymentData pd WITH(NOLOCK) ON ac.AccountChargeId = pd.AccountChargeId
WHERE
ai.AccountInvoiceStatusId <> 4 AND
ci.RemitToSchool = 1 AND
a.SchoolId = 6 AND
a.SchoolYearId = 12
GROUP BY
apd.DueDate,
apd.RemittanceEffectiveDate,
a.SchoolId,
a.SchoolYearId
HAVING
SUM(ac.NetAmount) <> 0
ORDER BY
apd.DueDate ASC;