如何在SQL Server 2005中使用子查詢作爲別名

Question

這是我的代碼。它給了我一個錯誤。

select 
b.bill_no as 'Bill Number', 
(select descript from SALE_TERMS where STERMS_CODE='99')=b.[99] 
from BILLDET as b 

Answer 1

爲什麼不乾脆：

SELECT 
    b.bill_no as 'Bill Number', 
    (SELECT descript FROM SALE_TERMS WHERE STERMS_CODE = '99') AS 'Code99' 
FROM 
    BILLDET as b 

Answer 2

SELECT 
    b.bill_no as 'Bill Number', 
    ST.[99] 
FROM 
    BILLDET as b 
    CROSS JOIN 
    (SELECT descript AS [99] FROM SALE_TERMS WHERE STERMS_CODE = '99') ST 

還是你meanthis？

SELECT 
    b.bill_no as 'Bill Number', 
    ST.descript 
FROM 
    BILLDET as b 
    JOIN 
    SALE_TERMS st ON b.[99] = ST.STERMS_CODE 
WHERE 
    ST.STERMS_CODE = '99' 

Answer 3

你的例子幾乎是正確的，除了賦值之外，它應該是一個包含列名的'AS'語句。 此外，它在你的子查詢中使用TOP 1件好事，萬一STERMS_CODE值不是唯一的：

SELECT 
b.bill_no AS 'Bill Number', 
(SELECT TOP 1 descript from SALE_TERMS WHERE STERMS_CODE='99') AS [99] 
FROM BILLDET AS b