-- 检查ITEM MASTER中的LAST PRICE与PO中的UNIT PRICE不一致的ITEM LIST
SELECT P.ITEM_CODE,P.INVOICE, P.SO_NUMBER, P.INDATE,
P.DESC1, P.UPRICE,I.LAST_PRICE,H.CRT_USER
FROM PO_LN1 P ,PO_HEAD1 H ,UN_ITEM1 I
WHERE P.ITEM_CODE=I.ITEM_CODE
AND H.PO_NUMBER =P.INVOICE
AND P.UPRICE<>I.LAST_PRICE
AND SUBSTRING(P.ITEM_CODE,9,1)='1'
AND P.CRRNCY NOT LIKE 'RMB'
AND P.CRRNCY NOT LIKE 'USD'
ORDER BY P.ITEM_CODE


-- 检查ITEM MASTER中的LAST PRICE与COST SHEET 中的UNIT PRICE不一致的ITEM LIST
SELECT C.PRODUCT_CODE, C.ITEM_CODE, C.UPRICE, I.LAST_PRICE ,I.LST_USER,I.CRT_DATE
FROM CS_METAL C JOIN UN_ITEM1 I
ON C.ITEM_CODE=I.ITEM_CODE
WHERE C.UPRICE<>I.LAST_PRICE
AND SUBSTRING(C.PRODUCT_CODE,9,1)='1'
ORDER BY C.PRODUCT_CODE

 我想反正都要与同一张UN_ITEM1 I里面的单价进行比较，
三者只要有任何二者不等的话，就可以显示， （并集的SQL语句如何写）？

三者都不相等的交集，也可以单独显示。   （交集的SQL语句如何写）？

怎么没有人回答：是不是我的题意表述这不清呀？
下面我做的答案：
请大家指正一下：
三者都不相等的交集，也可以单独显示。   （交集的SQL语句如何写）
select te.ITEM_CODE,C.PRODUCT_CODE,te.INVOICE AS PO_NO, te.SO_NUMBER, te.INDATE AS PO_LASTUPDATE,
te.DESC1, te.UPRICE AS PO_UPRICE,te.LAST_PRICE,C.UPRICE AS COSTSHEETUPRICE,te.CRT_USER AS PO_CREATEUSER ,te.CRT_DATE AS ITEM_LASTUPDATE
 from (SELECT P.ITEM_CODE,P.INVOICE, P.SO_NUMBER, P.INDATE,
P.DESC1, P.UPRICE,I.LAST_PRICE,H.CRT_USER,I.CRT_DATE
FROM PO_LN1 P ,PO_HEAD1 H ,UN_ITEM1 I
WHERE P.ITEM_CODE=I.ITEM_CODE
AND H.PO_NUMBER =P.INVOICE
AND P.UPRICE<>I.LAST_PRICE
AND SUBSTRING(P.ITEM_CODE,9,1)='1'
AND P.CRRNCY NOT LIKE 'RMB'
AND P.CRRNCY NOT LIKE 'USD'
) as te
inner join CS_METAL C
ON C.ITEM_CODE=te.ITEM_CODE
and (C.UPRICE<>te.UPRICE or C.UPRICE<>te.LAST_PRICE)
and  SUBSTRING(C.PRODUCT_CODE,9,1)='1'
ORDER BY C.ITEM_CODE,C.PRODUCT_CODE, te.INVOICE

－－－结果查询的结果会比原来两张表总记录数减去相同行的数后，还多了2行

三者只要有任何二者不等的话，就可以显示， （并集的SQL语句如何写）
select te.ITEM_CODE,C.PRODUCT_CODE,te.INVOICE AS PO_NO, te.SO_NUMBER, te.INDATE AS PO_LASTUPDATE,
te.DESC1, te.UPRICE AS PO_UPRICE,te.LAST_PRICE,C.UPRICE AS COSTSHEETUPRICE,te.CRT_USER AS PO_CREATEUSER ,te.CRT_DATE AS ITEM_LASTUPDATE
 from (SELECT P.ITEM_CODE,P.INVOICE, P.SO_NUMBER, P.INDATE,
P.DESC1, P.UPRICE,I.LAST_PRICE,H.CRT_USER,I.CRT_DATE
FROM PO_LN1 P ,PO_HEAD1 H ,UN_ITEM1 I
WHERE P.ITEM_CODE=I.ITEM_CODE
AND H.PO_NUMBER =P.INVOICE
AND SUBSTRING(P.ITEM_CODE,9,1)='1'
AND P.CRRNCY NOT LIKE 'RMB'
AND P.CRRNCY NOT LIKE 'USD'
) as te
inner join CS_METAL C
ON C.ITEM_CODE=te.ITEM_CODE
and (C.UPRICE<>te.UPRICE  or te.UPRICE<>te.LAST_PRICE  or C.UPRICE<>te.UPRICE )
and  SUBSTRING(C.PRODUCT_CODE,9,1)='1'
ORDER BY C.ITEM_CODE,C.PRODUCT_CODE, te.INVOICE

--结果查询出现的结果比两张查询的结果之和还多出100多条记录，

高手能不能帮忙分析一下？

没有愿意回答?
我很想知道正确答案的