视图的SELECT包含FROM子句中的子查询MySQL语句

Question

我有关于在MySQL工作台中创建视图的查询。我有错误：保存时，“视图的SELECT包含FROM子句中的子查询”。

这是我发言的副本：

CREATE VIEW viewMorningReport AS 
select z.AllocationDate, z.LocationName, z.StationName, a.00000100, b.01000200, c.02000300 from 
(SELECT DISTINCT AllocationDate, LocationName, StationName FROM satsschema.employeeslot 
where LocationName = 'T2 PML' 
and StationName is not null) z 
left outer join 
(SELECT AllocationDate, LocationName, StationName, EmpName AS '00000100' FROM  satsschema.employeeslot 
WHERE Assigned = true 
and (EmpTime = '00:00:00' && EmpTime < '01:00:00')) a 
on z.LocationName = a.LocationName and z.StationName = a.StationName 
left outer join 
(SELECT AllocationDate, LocationName, StationName, EmpName AS '01000200' FROM satsschema.employeeslot 
WHERE Assigned = true 
and (EmpTime = '01:00:00' && EmpTime < '02:00:00')) b 
on a.LocationName = b.LocationName and a.StationName = b.StationName 
left outer join 
(SELECT AllocationDate, LocationName, StationName, EmpName AS '02000300' FROM satsschema.employeeslot 
WHERE Assigned = true 
and (EmpTime = '02:00:00' && EmpTime < '03:00:00')) c 
on b.LocationName = c.LocationName and b.StationName = c.StationName 

任何想法，在哪里呢？

Answer 1

由于the official documentation says

E.4. Restrictions on Views

(..)

Subqueries cannot be used in the FROM clause of a view.

一种选择，可以创建每个子查询视图。 再一个，就是改变你的看法，以避免subquerys的from子句中

Answer 2

你可以创建视图的子查询，并呼吁他的主要观点