我有一个表单,用户在其中提取报告。在表单中,他们可以选择开始日期和结束日期,或者为两个值传递null。如果他们选择null,则返回所有记录,其中effectivedate <GETDATE()CASE语句似乎不喜欢,也不喜欢'<'运算符
这是我的剧本
SELECT * FROM tbReport
WHERE
EffectiveDate
CASE
WHEN (@StartDate IS NOT NULL AND @EndDate IS NOT NULL)
THEN BETWEEN (@StartDate AND @EndDate)
ELSE
THEN < GETDATE()
END
您可以在没有案例的情况下重写它,例如:
SELECT *
FROM tbReport
WHERE (
@StartDate is not null
and
@EndDate is not null
and
EffectiveDate between @StartDate AND @EndDate
)
or
(
(
@StartDate is null
or
@EndDate is null
)
and
EffectiveDate < getdate()
)
像这样的东西应该工作,我没有检查语法是否正确。
SELECT * FROM tbReport
WHERE EffectiveDate < IsNull(@EndDate,GetDate())
AND EffectiveDate > IsNull(@StartDate,'01/01/1979')
假设这是SQL Server,您可以使用isnull简化此操作:
select *
from tbReport
where EffectiveDate between isnull(@StartDate, '1 Jan 1990')
and isnull(@EndDate, getdate())
CASE的语法在这里都是错误的。试试这个:
SELECT * FROM tbReport
WHERE
(@StartDate is null and @EndDate is null and EffectiveDate < GetDate()) or
(@StartDate is not null and @EndDate is not null and
EffectiveDate >= @StartDate and EffectiveDate <= @EndDate)
SQL语句写得不正确。 Case不会有条件地选择评估的代码。您可以将大小写视为一个值,因此您必须在大小写和另一个操作数之间放置一个运算符。
写这个的多种方式之一是:
where
case when @StartDate IS NOT NULL AND @EndDate IS NOT NULL and EffectiveDate BETWEEN (@StartDate AND @EndDate) then 1
case when (@StartDate IS NULL OR @EndDate IS NULL) and EffectiveDate <getdate() then 1
else 0 end = 1
如果您不想用大写字母书写它,您可以选择其中一个解决方案,但它们使用离散的开始日期。
WHERE
(SR.RecCreateTS BETWEEN ( CASE WHEN @SubmittedBegining IS NOT NULL THEN @SubmittedBegining ELSE SR.RecCreateTS END )
AND ( CASE WHEN @SubmittedEnding IS NOT NULL THEN @SubmittedEnding ELSE SR.RecCreateTS END )
)