MYSQL - Stored Procedure Query Simplify - mysql

Question

I am new to MYSQL.
I need to customize this query. Now I am using only the IF condition and the query length is too big.
In this stored procedure only we change 'f.status' value based on _status value
EX:
__status = 'ALL'
ON f.financeId = t.financeId where f.status=0;
__status = 'PAID'
ON f.financeId = t.financeId where f.status=1;
__status = 'UNPAID'
ON f.financeId = t.financeId where f.status=2;
Query:
DELIMITER ;;
CREATE DEFINER=`root`#`localhost` PROCEDURE `all_data_search`(
_status VARCHAR(50)
)
BEGIN
IF (_status='All') THEN
SELECT
f.financeId,
f.customerId,
c.customerName,
c.initial,
c.phone1,
c.aadhaar,
f.financeStartDate,
f.vehicleNumber,
f.loanAmount,
f.totalInstallment,
f.installmentAmount,
COALESCE(t.payedInstallment, 0) as payedInstallment,
f.status,
f.created_by,
f.created_date,
f.updated_by,
f.updated_date
FROM finance f
INNER JOIN customer c
ON c.customerId = f.customerId
LEFT JOIN
(
SELECT financeId, COUNT(status) AS payedInstallment
FROM financeinstallment
WHERE status = 1
GROUP BY financeId
) t
ON f.financeId = t.financeId;
END IF;
IF (_status='0') THEN
SELECT
f.financeId,
f.customerId,
c.customerName,
c.initial,
c.phone1,
c.aadhaar,
f.financeStartDate,
f.vehicleNumber,
f.loanAmount,
f.totalInstallment,
f.installmentAmount,
COALESCE(t.payedInstallment, 0) as payedInstallment,
f.status,
f.created_by,
f.created_date,
f.updated_by,
f.updated_date
FROM finance f
INNER JOIN customer c
ON c.customerId = f.customerId
LEFT JOIN
(
SELECT financeId, COUNT(status) AS payedInstallment
FROM financeinstallment
WHERE status = 1
GROUP BY financeId
) t
ON f.financeId = t.financeId where f.status=0;
END IF;
IF (_status = 'PAID') THEN
SELECT
f.financeId,
f.customerId,
c.customerName,
c.initial,
c.phone1,
c.aadhaar,
f.financeStartDate,
f.vehicleNumber,
f.loanAmount,
f.totalInstallment,
f.installmentAmount,
COALESCE(t.payedInstallment, 0) as payedInstallment,
f.status,
f.created_by,
f.created_date,
f.updated_by,
f.updated_date
FROM finance f
INNER JOIN customer c
ON c.customerId = f.customerId
LEFT JOIN
(
SELECT financeId, COUNT(status) AS payedInstallment
FROM financeinstallment
WHERE status = 1
GROUP BY financeId
) t
ON f.financeId = t.financeId where f.status=1;
END IF;
IF (_status = 'UNPAID') THEN
SELECT
f.financeId,
f.customerId,
c.customerName,
c.initial,
c.phone1,
c.aadhaar,
f.financeStartDate,
f.vehicleNumber,
f.loanAmount,
f.totalInstallment,
f.installmentAmount,
COALESCE(t.payedInstallment, 0) as payedInstallment,
f.status,
f.created_by,
f.created_date,
f.updated_by,
f.updated_date
FROM finance f
INNER JOIN customer c
ON c.customerId = f.customerId
LEFT JOIN
(
SELECT financeId, COUNT(status) AS payedInstallment
FROM financeinstallment
WHERE status = 1
GROUP BY financeId
) t
ON f.financeId = t.financeId where f.status=2;
END IF;
END ;;
DELIMITER ;

Answer 1

declare status_flag smallint;
....
IF (_status = 'ALL') THEN status_flag=0;
ELSEIF (_status = 'PAID') THEN status_flag=1;
ELSEIF (_status = 'UNPAID') THEN status_flag=2;
ENDIF;
....
WHERE status = status_flag

Answer 2

You can use boolean operation as follows:
ON f.financeId = t.financeId
where (__status = 'ALL' and f.status=0)
or (__status = 'PAID' and f.status=1)
or (__status = 'UNPAID' and f.status=2);