sql - 如何总结两张表的结果？

Question

SupplierId NetAmt
1          400
2          400
3          300
2          200

SupplierId RecdAmt
2          200
2          200
2          200

预期结果：

1   400
3   300

第一个表是向内表，第二个表是付款表，当我向已完全付款的供应商付款时，不应再次显示

Answer 1

你可以这样做

select SupplierId , NetAmt from table1 
where SupplierId  not in (select SupplierId from table2)

或者

你也可以试试这个

SELECT SupplierId , NetAmt
FROM Table1 t1
    LEFT JOIN Table2 t2 ON t1.SupplierId = t2.SupplierId 
WHERE t2.SupplierId IS NULL

Answer 2

似乎您需要为每个供应商取得余额

SELECT ISNULL(NetTable.SupID, RecTable.SupID) AS SupID, (ISNULL(NetTable.TotalNet,0) - ISNULL(RecTable.TotalRec,0)) AS BalAmt
FROM (SELECT SupID, SUM(NetAmt) AS TotalNet FROM Table_1 GROUP BY SupID) AS NetTable
LEFT OUTER JOIN
(SELECT SupID, SUM(RecAmt) AS TotalRec FROM Table_2 GROUP BY SupID) AS RecTable
ON NetTable.SupID = RecTable.SupID
WHERE NetTable.TotalNet <> RecTable.TotalRec

需要单独对每个表进行 GROUP BY 供应商并加入摘要。