select records which are repeated twice!
I have a table in SQL Server with these records :
ID Date Time -- --------- ---- 1 09/05/02 6:00 2 09/05/02 8:00 3 09/05/03 6:00开发者_如何学C 4 09/05/04 8:00 5 09/05/04 6:00
I would like to select those ID who have records in a day which are repeated twice or multiple of two.
How would I do this in SQL Server?
Something like:
select table_1.id, table_1.date from
table as table_1 inner join table as table_2 on
table_1.date = table_2.date
and
table_1.id <> table_2.id
should work alright.
this query just select records with ID=1 and days which are repeated twice or multiple of 2 :
SELECT * FROM MyTable WHERE (Date IN (SELECT Date FROM MyTable WHERE (ID = 1) GROUP BY Date HAVING (COUNT(Date) % 2 = 0) ) ) AND (ID = 1)
this will return the expected result
declare @aa table (id int,datee date)
insert into @aa
select 1, '09/05/02' union all
select 2, '09/05/02' union all
select 3, '09/05/03' union all
select 4, '09/05/04' union all
select 5, '09/05/04'
select * from @aa where datee in (
select datee from @aa group by datee having COUNT(datee)>1)
Edit
CREATE TABLE MyTable(ID INTEGER, Date DATETIME)
INSERT INTO MyTable VALUES (1, '09/05/02 6:00')
INSERT INTO MyTable VALUES (1, '09/05/02 8:00')
INSERT INTO MyTable VALUES (2, '09/05/03 6:00')
INSERT INTO MyTable VALUES (3, '09/05/04 8:00')
INSERT INTO MyTable VALUES (4, '09/05/04 6:00')
SELECT t1.*
FROM MyTable t1
INNER JOIN (
SELECT t1.ID, Date1 = t1.Date, Date2 = t2.Date
FROM MyTable t1
INNER JOIN MyTable t2 ON CAST(t2.Date AS INTEGER) = CAST(t1.Date AS INTEGER)
AND DATEPART(HOUR, t2.Date) = DATEPART(HOUR, t1.Date) - 2
AND t2.ID = t1.ID
) t2 ON t2.ID = t1.ID AND t1.Date IN (t2.Date1, t2.Date2)
It's not quite clear to me from your layout whether the date and the time are in separate columns, or just one. That is, do you have
ID theDate theTime
-- -------- -------
1 09/05/02 6:00
1 09/05/02 8:00
2 09/05/03 6:00
3 09/05/04 8:00
4 09/05/04 6:00
or
ID theDateTime
-- -------------
1 09/05/02 6:00
1 09/05/02 8:00
2 09/05/03 6:00
3 09/05/04 8:00
4 09/05/04 6:00
If the first is true, as it seems, then Ramesh has nearly, but not quite, the correct answer:
select *
from theTable
where theDate in (
select theDate
from theTable
group by theDate
having count(theDate) % 2 = 0
)
If the second is true, your job is significantly more complex - I'll take a think about it.
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