CODEWITHSUNDEEP
sqlcompare
Grandanat
Grandanat

Reputation: 181

SQL query to compare rows

I have a table like this:

    Sequence    ID      Date          other fields

    1           23      2012-01-01
    2           23      2012-02-03
    3           23      2012-02-02
    4           45      2012-01-01
    5           45      2012-01-02
    6           52      2012-01-01
    7           52      2012-03-01
    ..          ...

I need a query that returns me rows that have inversed dates(there is a higher sequence with an older date

in example abow it should return rowq with sequence 2 and 3. For id 23, Seq 2 has date newer that sequence no 3.

Thanks

Upvotes: 2

Views: 1707

Answers (3)

Joe G Joseph
Joe G Joseph

Reputation: 24046

try this:

select Sequence,ID,Date 
from   
   ( select *,
     ROW_NUMBER() over (partition by ID order by date) as row_num_date,
     ROW_NUMBER() over (partition by ID order by Sequence) as row_num_seq
     from your_table )a
where row_num_date!=row_num_seq


SQL Fiddle Demo

Upvotes: 1

Dumitrescu Bogdan
Dumitrescu Bogdan

Reputation: 7267

select t1.*
from <table> t1
  join <table> t2 
    on  t1.Id=t2.Id
    and (((t1.Sequence>t2.Sequence) and (t1.Date<t2.Date)) or
         ((t1.Sequence<t2.Sequence) and (t1.Date>t2.Date)))

And the fiddle for it http://sqlfiddle.com/#!3/beaf8/2/0

Upvotes: 3

Dmitry Osinovskiy
Dmitry Osinovskiy

Reputation: 10118

select * from 
   (select T1.Sequence as S1, T2.Sequence as S2, T1.ID 
    from T as T1, T as T2
    where T1.Sequence < T2.Sequence 
      and T1.Date > T2.Date 
      and T1.ID = T2.ID) Subq
   inner join T on (T.ID = Subq.ID 
               and (T.Sequence = Subq.S1 or T.Sequence = Subq.S2))

Upvotes: 1

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