Question

我有一个数据结果，我希望按两个不同的日期过滤。

以下是有效的，除非completion_date为null。如果它为null我想使用一个名为created_date的不同字段。

string strSQL = string.Format(@"select * from my_table 

            where user_Id = {0}

            AND [completion_date] between {1} AND {2}

            order by completion_status  desc, [completion_date] asc"
            , userId, dateStart, dateEnd, visibilityIndicator);

也许是这样的：

string strSQL = string.Format(@"select * from my_table                                                   
where user_Id = {0}


CASE completion_date 
     WHEN is null THEN [completion_date] between {1} AND {2}
     ELSE [created_date] between {1} AND {2}

END 

AND                       
            order by completion_status  desc, [completion_date] asc"
            , userId, dateStart, dateEnd, visibilityIndicator);

检查该空值然后切换到created_date的最佳方法是什么？

Answer 1

where isnull(completetion_date,created_date) between {1} and {2}

应该有效

Answer 2

string strSQL = string.Format(@"select * from my_table 
where user_Id = {0}
AND ISNULL([completion_date],[created_date]) between {1} AND {2}
 order by completion_status  desc, [completion_date] asc"

Answer 3

ANSI SQL兼容版本：

SELECT * FROM my_table WHERE user_Id = {0}
AND [completion_date] BETWEEN {1} AND {2}
OR ([completion_date] IS NULL AND [created_date] BETWEEN {1} AND {2})
ORDER BY completion_status DESC, [completion_date] ASC

SQL检查Null Date然后Case Check

3 个答案: