Oracle SQL-將來自多個表的結果集中的同一列中的值合並

Question

我很想知道如何合並來自兩個不同表的同一列中的多個記錄。 例如下面是我的表：

注釋表：

INVOICE NOTES
1000    REPLACE PUMP
1000    REPLACE OIL
1000    REPLACE FILTER
1111    WO# 123
1111    REPLACE GASKET
1234    REPLACE OIL

發票表：

INVOICE AMOUNT
1000    100
1111    50
1234    20

我可以運行此查詢和結果：

SELECT INV.INVOICE, INV.AMOUNT FROM INVOICE INV
INNER JOIN NOTES ON INV.INVOICE = NOTES.INVOICE

但我想將每個發票的注釋合並到結果集中的一欄中。 例如，我的結果應如下所示

INVOICE  AMOUNT     NOTES
1000     100        REPLACE PUMP, REPLACE OIL, REPLACE FILTER
1111     50         WO# 123,REPLACE GASKET
1234     20         REPLACE OIL

Answer 1

文檔-listagg

詢問

with inv_notes as
(select 1000 as INVOICE, 'REPLACE PUMP' as notes from dual union all
select 1000, 'REPLACE PUMP' from dual union all
select 1000, 'REPLACE OIL' from dual union all
select 1000, 'REPLACE FILTER' from dual union all
select 1111, 'WO# 123' from dual union all
select 1111, 'REPLACE GASKET' from dual union all
select 1234, 'REPLACE OIL' from dual
) 
,
inv_amount as (
select 1000 as INVOICE, 100 AMOUNT from dual union all
select 1111, 50 from dual union all
select 1234, 20 from dual)
select a.invoice, a.amount, listagg(n.notes, ',') WITHIN GROUP (ORDER BY a.invoice, a.amount) notes
from inv_notes n
 inner join inv_amount a on n.invoice = a.invoice
group by a.invoice, a.amount 

結果

1   1000    100 REPLACE FILTER,REPLACE OIL,REPLACE PUMP,REPLACE PUMP
2   1111    50  REPLACE GASKET,WO# 123
3   1234    20  REPLACE OIL