我有這個SQL搜索查詢的作品，但它只適用於投票表中存在投票。 mysql_query("SELECT m.Title, r.Subject, SUM(v.IsGood) AS Good, SUM(v.IsBad) AS Bad
FROM Movies m
JOIN Reviews r
ON m.ID=r.MovieID
JOIN Votes v
在PL/SQL喜是新手 我需要爲具有小於5員工500 這裏所有的項目更新rate_per_hour是我寫的代碼，但它更新所有員工 set serveroutput on
declare
cursor rate_cur is
select * from project
for update of rate_per_hour;
begin
for rate
我的SQL語句是 SELECT c.type,c.title,c.datereg, d.ranknum
FROM T_News AS c
INNER JOIN (
SELECT a.id, COUNT(*) AS ranknum
FROM T_News AS a
INNER JOIN T_News AS b
ON (a.type = b.t
我想檢索具有最大值'PNRno'列的行，其中PNRno是主Tktrsrv的關鍵，並與多個表的realatioship。代碼寫爲： Select
PNRcd,PNRno, Tktno, Tno, Tname, Doj, Class, brding, rsrvdupto
from Tktrsrv
GROUP BY PNRno
Having PNRno= Max(PNRno);
請幫幫我。
在MySQL select a,b,count(1) as cnt from list group by a, b having cnt > 2;
我具有由功能使用具有mongodb的條件時執行的組。 但我得到以下錯誤。請分享您的意見。 在MongoDB中 > res = db.list.group({key:{a:true,b:true},
... reduce: functio