Question

DECLARE @dateFrom   DATETIME;
DECLARE @dateTo     DATETIME;

declare @tempholidays table (holidays datetime);

insert into @tempholidays values(CONVERT(datetime, '2018-01-01'));
insert into @tempholidays values(CONVERT(datetime, '2018-02-19'));
insert into @tempholidays values(CONVERT(datetime, '2018-04-06'));
insert into @tempholidays values(CONVERT(datetime, '2018-04-09'));
insert into @tempholidays values(CONVERT(datetime, '2018-05-01'));
insert into @tempholidays values(CONVERT(datetime, '2018-05-28'));
insert into @tempholidays values(CONVERT(datetime, '2018-08-15'));
insert into @tempholidays values(CONVERT(datetime, '2018-12-25'));
insert into @tempholidays values(CONVERT(datetime, '2018-12-26'));

我有一个带有一些日期时间的临时表。我想知道在特定的日期时间范围（dateFrom，dateTo）中存在多少这些条目。例如，如果我给出范围（datefrom ='2018-05-27'和dateto ='2018-05-29'），结果应为1。

Answer 1

DECLARE @dateFrom   DATETIME;
DECLARE @dateTo     DATETIME;

declare @tempholidays table (holidays datetime);

insert into @tempholidays values(CONVERT(datetime, '2018-01-01'));
insert into @tempholidays values(CONVERT(datetime, '2018-02-19'));
insert into @tempholidays values(CONVERT(datetime, '2018-04-06'));
insert into @tempholidays values(CONVERT(datetime, '2018-04-09'));
insert into @tempholidays values(CONVERT(datetime, '2018-05-01'));
insert into @tempholidays values(CONVERT(datetime, '2018-05-28'));
insert into @tempholidays values(CONVERT(datetime, '2018-08-15'));
insert into @tempholidays values(CONVERT(datetime, '2018-12-25'));
insert into @tempholidays values(CONVERT(datetime, '2018-12-26'));

set @dateFrom = 'May 27, 2018'
set @dateTo = 'May 29, 2018'

select
    count(*) countx
from
    @tempholidays h
where
    h.holidays between @dateFrom and @dateTo

Answer 2

我认为这可以满足您的要求

select count(*)
from @tempholidays th
where th.date >= @datefrom and th.date <= @dateto;

检查一个表中有多少个DateTime可以容纳一系列的DateTimes

2 个答案: