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
我有这两个查询 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_
我试图做一个查询来过滤来自一个表的行,然后在另一个表上结合结果,然后过滤掉其他的行。 这里是我写的查询: SELECT *
FROM (SELECT media.id AS id2, media.flagged AS flagged2, media.item_status AS status2
FROM media
WHERE flagged2 != 'nsfw
我试图运行这个查询。 select *
from (select *
from student
where dept_name= ’Comp. Sci’)
natural left outer join
(select *
from takes
where semester = ’Spring’ and year = 2009
查询是让每个表的日期,我已经检查了我的代码,但它还是错误的“每一个派生的表必须有它自己的别名错误”
SELECT T.*
FROM (
SELECT DISTINCT(DATE_FORMAT(p.deliverDate, '%M')) as PDate
FROM piglet_po p
WHERE p.raiserID = '0025' AND p.rota
我有一个包含500多个表的数据库,每个表具有相同的结构,其中包含来自传感器的历史数据。我试图想出一个查询来查找,例如,传感器n超过x的所有实例。问题是表是动态的,查询必须能够动态获取表的列表。 我可以查询INFORMATION_SCHEMA.TABLES拿到表的列表,像这样: SELECT table_name
FROM information_schema.tables
WHERE tabl