使用 SQL Server 2008.我有一个存储过程,它具有开始和结束日期作为日期范围的输入参数.
Using SQL Server 2008. I have a stored proc which has start and end date as input parameters for date range.
正在寻找一个 单一 sql 查询,它在 where 子句中具有开始和结束日期之间的日期,该查询可以处理日期均为空或两者都有值的两种情况.
Looking for a single sql query which has a between start and end date in the where clause which can handle both cases where the dates are either both null or both have values.
我不想使用 IF 语句.
I don't want to use an IF statement.
WITH limits AS
(
SELECT COALESCE(@startDate, MIN(mydate)) AS startDate, COALESCE(@endDate, MAX(mydate)) AS endDate
FROM mytable
)
SELECT m.*
FROM limits
JOIN mytable m
ON mydate BETWEEN startDate AND endDate
如果在 mydate
上有索引,这将是最有效的,因为这个条件是 sargable 并且将使用 Index Seek
.
This will be most efficient if there is an index on mydate
, since this condition is sargable and will use an Index Seek
.
如果没有索引,则使用其他人提出的IFNULL
结构.
If there is no index, then use IFNULL
constructs proposed by others.
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