数据库SQL查询问题错误＃1066

Question

查询问题：

SELECT B.branchNo, B.city, S.staffNo, fName, lName, propertyNo 
FROM Branch B, Staff S, PropertyForRent P 
WHERE B.branchNo = S.branchNo AND S.staffNo = P.staffNo 
ORDER BY B.branchNo, S.staffNo, propertyNo ; 

错误＃1066 - 不唯一的表/别名：

我使用了类似的查询，这个 'B' 和他们的工作，这其中只是没有。

我也试过：

SELECT B.branchNo, B.city, S.staffNo, S.fName, S.lName, S.propertyNo 
FROM Branch B, Staff S, PropertyForRent P 
WHERE B.branchNo = S.branchNo AND S.staffNo = P.staffNo 
ORDER BY B.branchNo, S.staffNo, propertyNo ; 

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Answer 1

显然它应该工作或也许我失去了一些东西，但它的奇怪。试试这个：

SELECT B.branchNo, B.city, S.staffNo, fName, lName, propertyNo 
FROM Branch B 
JOIN Staff S 
ON B.branchNo = S.branchNo 
JOIN PropertyForRent P 
ON S.staffNo = P.staffNo 
ORDER BY B.branchNo, S.staffNo, propertyNo 

Answer 2

SELECT B.branchNo, 
     B.city, 
     S.staffNo, 
     S.fName, 
     S.lName, 
     S.propertyNo 

FROM Branch B 
Join Staff S 
On B.branchNo = S.branchNo 

Join PropertyForRent P 
On S.staffNo = P.staffNo 

ORDER BY B.branchNo, S.staffNo, S.propertyNo ; 

Answer 3

尝试把一个 “S.propertyNo” 在您的ORDER BY：

SELECT B.branchNo, B.city, S.staffNo, S.fName, S.lName, S.propertyNo 
FROM Branch B, Staff S, PropertyForRent P 
WHERE B.branchNo = S.branchNo AND S.staffNo = P.staffNo 
ORDER BY B.branchNo, S.staffNo, S.propertyNo ;