如何联接3个表并仅在第三个表上选择最大日期

Question

我正在尝试获取tbl_paid中的最新日期。 我已经获取了我想要的数据到前两个表，然后在第三个表中我只想获取最大日期。

我的第一个查询中有这个

SELECT * FROM tbl_client TC LEFT OUTER JOIN (SELECT c_id , MAX(transaction_num) MaxTransaction, MAX(loan_end) loan_end, collection FROM tbl_loan group by c_id) TL ON TL.c_id = TC.c_id

我只加入了两个表tbl_client c_id, acc_number, contact_num, fullname, address, remarks, penalty和tbl_loan l_id, date_loan, loan_term, loan_end, collection, transaction_num, principal, interest, total_interest, total, payment, c_id

我想加入第三张表并从tbl_paid获取最新的pay_date，其中tbl_paid.c_id = tbl_loan.c_id和tbl_paid.transaction_num = tbl_loan.MaxTransaction_num

tbl_paid

p_id reciept_num金额pay_date c_id transaction_num

tbl_client

tbl_loan

tbl_paid

Answer 1

 SELECT * FROM tbl_client TC LEFT OUTER JOIN (SELECT c_id, MAX(transaction_num) MaxTransaction, MAX(loan_end) loan_end, collection FROM tbl_loan group by c_id) TL ON TL.c_id = TC.c_id LEFT OUTER JOIN (SELECT c_id, Max(transaction_num), Max(pay_date) pay_date from tbl_paid group by c_id) TP ON TP.c_id = TC.c_id