How do I retrieve data from two tables? - mysql

Question

I was on the "hospital_payment_data" table.
I want to call up the data of the number of data, the cache_account_received sum, and the total_medical_bills sum, and then bring up the mount sum value from the cash_recipit_rowtable to express. What should I do?
hospital_payment_data
cash_receipt_row
I want result
However, sending the following queries results in the following:
SELECT
COUNT(*) as total,
SUM(cash_amount_received) AS sum_cash_amount_received,
COUNT(
IF(total_medical_bills >= 100000 AND
cash_amount_received , total_medical_bills, NULL)
) as obligatory_issue,
SUM(
IF(total_medical_bills >= 100000 AND
cash_amount_received , cash_amount_received, NULL)
) as sum_obligatory_issue,
SUM(amount) AS sum_amount
FROM (
SELECT total_medical_bills, cash_amount_received, amount
FROM hospital_payment_data, cash_receipt_row
) AS a
wrong result

Answer 1

Try this.
SELECT
COUNT(*) as total,
SUM(cash_amount_received) AS sum_cash_amount_received,
COUNT(
IF(total_medical_bills >= 100000 AND
cash_amount_received , total_medical_bills, NULL)
) as obligatory_issue,
SUM(
IF(total_medical_bills >= 100000 AND
cash_amount_received , cash_amount_received, NULL)
) as sum_obligatory_issue,
SUM(amount) AS sum_amount
FROM (
SELECT total_medical_bills, cash_amount_received, amount
FROM hospital_payment_data, cash_receipt_row
WHERE hospital_payment_data.id = cash_receipt_row.id
) AS a

Answer 2

Never use commas in the FROM clause. Always use proper, explicit, standard, readable JOIN syntax.
You can also simplify your counting logic in MySQL. There is no need for IF() or a subquery:
SELECT COUNT(*) as total,
SUM(cash_amount_received) AS sum_cash_amount_received,
SUM( total_medical_bills >= 100000 AND
obligatory_issue <> 0
) as obligatory_issue,
SUM(CASE WHEN total_medical_bills >= 100000
THEN cash_amount_received
END) as sum_obligatory_issue,
SUM(amount) AS sum_amount
FROM hospital_payment_data hpd JOIN
cash_receipt_row crr
ON hpd.id = crr.id;
You'll notice that where conditional logic is needed, then this uses the standard SQL construct, CASE, rather than IF.