从两个表联接中获取每个记录的最后修改值？

Question

I have two tables accounts and calls . Account table contain the Account details and call table contain the call details like date_modified and others with account id in parent_id column.

There are lots of the records and I need a query which fetch all the accounts with their last call details (Most recent call).

I have tried this but not able to get the result.

SELECT accounts.id, accounts.name, calls.name subject 
FROM accounts 
INNER JOIN calls ON accounts.id = calls.parent_id 
WHERE accounts.id=(
   SELECT c.parent_id 
   FROM calls c 
   WHERE c.parent_id = calls.parent_id 
   ORDER BY c.date_modified DESC LIMIT 1
)

Answer 1

Please try this query and let me know the result:

SELECT accounts.id, accounts.name, calls.name subject 
FROM accounts 
INNER JOIN calls ON accounts.id = calls.parent_id 
WHERE calls.date = (
   SELECT max(c.date)
   FROM calls c 
   WHERE c.parent_id = calls.parent_id)

Answer 2

Try this query: it should work.

SELECT * FROM Accounts A
INNER JOIN
(
    SELECT 
        c.parent_id
        ,c.name
        ,c.date_modified
    FROM calls C
    INNER JOIN 
    (
        SELECT 
            parent_id
            ,MAX(date_modified) call_date
        FROM calls 
        GROUP BY parent_id
    ) CC ON CC.parent_id = c.parent_id AND CC.call_date = c.date_modified

) CCC ON CCC.parent_id = A.id