我有以下表格: tblPerson: PersonID | Name
---------------------
1 | John Smith
2 | Jane Doe
3 | David Hoshi
tblLocation: LocationID | Timestamp | PersonID | X | Y | Z | More Columns...
擁有傳統的「職位表和評論表與外鍵到職位表」場景,獲得最後20個職位的ID在他們的最後時間排序的最有效方法是什麼評論和實際評論本身? 這裏是工作,但大概可以更有效地進行查詢: SELECT * FROM (
SELECT * FROM comments ORDER BY time DESC
) AS foo GROUP BY post_id ORDER BY time DESC LIMIT
可以說我有一個表如 Request No. Type Status
---------------------------
1 New Renewed
,然後另一個表 Action ID Request No LastUpdated
------------------------------------
1 1 06-10-2010
2 1 07-14-201
我有一個問題,一個SQL語句: 使用此 select a.id as ID, a.dur as DUR, DATE(FROM_UNIXTIME(timestampCol)) as date,
a_au.re as RE, a_au.stat as STAT from b_c
inner join c on b_c.c_id = c.id
inner join a on c.i