代码 - 1248 - 每个派生表必须有自己的别名吗？

Question

我正在尝试使用union创建新表， 这些代码有什么问题？

insert into chart

select months, field, value from (

select hp.months, 'ActualBookings2014' as field, hp.ActualBookings2014 as value
FROM         hp_metglobal.hp

UNION

select hp.months, 'TargetBookings' as field, hp.TargetBookings as value
FROM        hp_metglobal.hp

UNION

select hp.months, 'ActualBookings2013' as field, hp.ActualBookings2013 as value
FROM         hp_metglobal.hp

)

Answer 1

请使用内表的别名：

insert into chart

select months, field, value from ((

select hp.months, 
       'ActualBookings2014' as field,
        hp.ActualBookings2014 as value
FROM    hp_metglobal.hp

UNION

select hp.months, 
       'TargetBookings' as field,
        hp.TargetBookings as value
FROM    hp_metglobal.hp

UNION

select  hp.months, 
        'ActualBookings2013' as field,
        hp.ActualBookings2013 as value
FROM    hp_metglobal.hp

) as t)