如何从两个数据表中减去相似列和值的行

Question

如何从两个sql数据表中减去值？在pic我有两个数据表，我想先匹配table1＆＃34; partnum＆＃34;列，如果它与表2＆＃34; partnum＆＃34;匹配然后从table2＆＃34; FinalStockout＆＃34;中减去table1＆＃34; FinalstockIN＆＃34;值。然后将其显示在另一列中。

我从别人的建议中尝试过但这并没有显示完整的数据。

with spare_parts as (

SELECT s.partnum,partdesc,partmodel,stockin,dateofstockin, (SELECT 
SUM(stockin)
FROM Tbl_SpareParts
GROUP BY partnum
HAVING partnum = s.partnum) AS FinalTotalStockIN FROM Tbl_SpareParts s
),
cases as (
SELECT 
b.partnum,partdesc,partmodel,outstock,outstockdate,
outstockcaseid_billnum,remarks, (SELECT SUM(outstock)
FROM Tbl_OutCaseID
GROUP BY partnum
HAVING partnum = b.partnum) AS FinalTotalStockOut FROM Tbl_OutCaseID b
)
select
s.partnum, s.partdesc, s.partmodel, s.stockin, 
s.dateofstockin, s.FinalTotalStockIN,
c.partnum AS Stockoutpartnum, 
c.partdesc AS Stockoutpartdesc, 
c.partmodel AS stockoutpartmodel, c.outstock, 
c.outstockdate, c.outstockcaseid_billnum, 
c.remarks, c.FinalTotalStockOut
from
spare_parts s
join cases c on s.partnum = c.partnum

Answer 1

SELECT STOCKOUTPARTNUM,STOCKOUTPARTNUM,NULL FROM TABLE 2 MINUS SELECT PARTNUM,NULL,PARTNUM FROM TABLE 1

DATATYPE必须与PARTNUM相同的STOCKOUTPARTNUM