相关疑难解决方法(0)

SELECT logcount, logUserID, maxlogtm
   , DATEDIFF(day, maxlogtm, GETDATE()) AS daysdiff
FROM statslogsummary
WHERE daysdiff > 120

我明白了

"无效的列名称daysdiff".

Maxlogtm是一个日期时间字段.这是让我疯狂的小东西.

我们如何过滤别名？例如，在下面的查询中，对于别名 OLB，如果我们想说 WHERE OLB > 0

SELECT
loan.lnr
,loan.lamount - SUM (memrepay.mprinc) AS OLB
,lstatus

FROM
 loan
  LEFT OUTER JOIN memrepay
  ON loan.lnr = memrepay.lnr

WHERE
loan.tstart >= N'2013-07-07T14:00:00' 

GROUP BY loan.lnr, lamount, lstatus

Order By lnr

我从我的SQL Server收到此错误消息:

列名称'价格'无效

在Microsoft SQL Server Management Studio中.

我的SQL语句:

SELECT
    CASE
       WHEN salePriceDate BETWEEN salePriceStartDate AND salePriceEndDate
          THEN salePrice
          ELSE 
             CASE
                WHEN salePriceDate2 BETWEEN salePriceStartDate2 AND salePriceEndDate2
                   THEN salePrice2
                   ELSE normalPrice
             END
    END AS price
FROM 
    prices
WHERE 
    price BETWEEN 1 AND 100

我怎么解决这个问题？