我在oracle中用Left external join编写了一个查询，但是执行查询时出现ORA-00904: "b"."GROSS_DISCOUNT_AMOUNT": invalid identifier错误.TableB包含net_discount_number和gross_discount_amount列。
select
a.GSMNO GSMNO,
a.NET_AMOUNT net,
a.GROSS_AMOUNT gross,
sum(b.net_discount_amount) net_discount, sum(b.gross_discount_amount) gross_discount,
a.code code, a.seq_no
from tableA a
LEFT OUTER JOIN
(select id, code, seq_no, sum(gross_amount) gross_amount, sum(net_discount_amount), sum(gross_discount_amount) from tableB
group by id, code, seq_no)
b ON a.id = b.id and NVL(a.code,b.code) = NVL(b.code,-99) and
NVL(a._seq_no,-99) = NVL(b.seq_no,-99)
and a.gross_amount = b.gross_amount
where a.tvNo like '123% and gsmno ='1111111111'
group by
a.GSMNO,
a.NET_AMOUNT,
a.GROSS_AMOUNT,
a.code, a.seq_no
您尚未为总和指定别名，它应该像这样：
select
a.GSMNO GSMNO,
a.NET_AMOUNT net,
a.GROSS_AMOUNT gross,
sum(b.net_discount_amount) net_discount, sum(b.gross_discount_amount) gross_discount,
a.code code, a.seq_no
from tableA a
LEFT OUTER JOIN
(select id, code, seq_no,
sum(gross_amount) gross_amount,
sum(net_discount_amount) net_discount_amount,
sum(gross_discount_amount) gross_discount_amount
from tableB
group by id, code, seq_no)
b ON a.id = b.id and NVL(a.code,b.code) = NVL(b.code,-99) and
NVL(a._seq_no,-99) = NVL(b.seq_no,-99)
and a.gross_amount = b.gross_amount
where a.tvNo like '123% and gsmno ='1111111111'
group by
a.GSMNO,
a.NET_AMOUNT,
a.GROSS_AMOUNT,
a.code, a.seq_no
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