Question

有没有消除这个光标逻辑？

我需要迭代@YearMonth（最终看起来类似于：“2015-01”，“2015-02”，“201503”（截至当前日期）

DECLARE myCursor CURSOR
FOR SELECT DISTINCT(YearMonth) FROM Submissions
OPEN myCursor

FETCH NEXT FROM myCursor INTO @YearMonth
LOOP BEGIN
            INSERT INTO #EngagementCount (YearMonth, EngagmentCount)
            SELECT @YearMonth AS YearMonth COUNT(e.EngagementID) AS EngagementCount
            FROM Engagements AS e
            WHERE @YearMonth >= e.StartDate and @YearMonth < e.ExpiresOn
LOOP END

Answer 1

这应该有效：

SELECT YearMonth, COUNT(e.EngagementID) AS EngagementCount 
FROM Submissions s
INNER JOIN Engagements e ON s.YearMonth BETWEEN e.StartDate AND e.Expires
GROUP BY YearMonth

重写TSQL以消除游标

1 个答案: