Question

我想要过滤两个参数，如果competitorID为null或为零，那么我应该针对另一个表中的所有竞争对手id过滤该集合，否则我应该针对competitorID进行过滤。

我写了以下内容，但它是错误的，因为它过滤了所有竞争对手。

SELECT
       *
  FROM DashboardDataCache AS d
  WHERE ISNULL ( @CompetitorID , 0 ) = 0
     OR d.CompetitorID IN ( 
                            SELECT
                                   Value
                              FROM dbo.SessionFilters
                              WHERE SessionID = @SessionID
                                AND field IN ( 'competitor' , 'article_competitor' )) ;

Answer 1

尝试更改您的查询，如下所示：

SELECT
   *
FROM DashboardDataCache AS d
      -- Filter by ID if @CompetitorID is not null
WHERE (@CompetitorID IS NOT NULL AND d.CompetitorID = @CompetitorID)
      -- Otherwise, filter using SELECT
OR    (@CompetitorID IS NULL AND  d.CompetitorID IN (
          SELECT Value
          FROM dbo.SessionFilters
          WHERE SessionID = @SessionID
           AND field IN ( 'competitor' , 'article_competitor' )));

Answer 2

尝试这样：

SELECT
       *
  FROM DashboardDataCache AS d
  WHERE (ISNULL ( @CompetitorID , 0 ) = 0 and d.CompetitorID = @CompetitorID)
     OR (ISNULL ( @CompetitorID , 0 ) != 0
         AND d.CompetitorID IN ( 
                            SELECT
                                   Value
                              FROM dbo.SessionFilters
                              WHERE SessionID = @SessionID
                                AND field IN ( 'competitor' , 'article_competitor' ))) ;

sql中的条件where语句？

2 个答案: