我有這兩個查詢 select
t . *, events.event_time as last_time
from
events,
(
(
select
bonding.type,
bonding.global_id2 as target_post,
bonding.target_id as on_whose_
我試圖做一個查詢來過濾來自一個表的行,然後在另一個表上結合結果,然後過濾掉其他的行。 這裏是我寫的查詢: SELECT *
FROM (SELECT media.id AS id2, media.flagged AS flagged2, media.item_status AS status2
FROM media
WHERE flagged2 != 'nsfw
我試圖運行這個查詢。 select *
from (select *
from student
where dept_name= ’Comp. Sci’)
natural left outer join
(select *
from takes
where semester = ’Spring’ and year = 2009
查詢是讓每個表的日期,我已經檢查了我的代碼,但它還是錯誤的「每一個派生的表必須有它自己的別名錯誤」
SELECT T.*
FROM (
SELECT DISTINCT(DATE_FORMAT(p.deliverDate, '%M')) as PDate
FROM piglet_po p
WHERE p.raiserID = '0025' AND p.rota
我有一個包含500多個表的數據庫,每個表具有相同的結構,其中包含來自傳感器的歷史數據。我試圖想出一個查詢來查找,例如,傳感器n超過x的所有實例。問題是表是動態的,查詢必須能夠動態獲取表的列表。 我可以查詢INFORMATION_SCHEMA.TABLES拿到表的列表,像這樣: SELECT table_name
FROM information_schema.tables
WHERE tabl
mysql> Select Emp_B AS Total
-> From (Select Sum(mines.NoOfWorkers) AS Emp_B from mines);
ERROR 1248 (42000): Every derived table must have its own alias
mysql> Select Emp_B AS Total
-> F