Improve company productivity with a Business Account.Sign Up

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 338
  • Last Modified:

sql logic help in sql server 2005

Hi I have a table with following sample data

  a    b        start          end               c
111      1      1/1/2011      1/2/2011             11
111      1      1/2/2011      1/6/2011             11
111      1      1/7/2011      12/31/9999      11
111      2      1/6/2011      1/7/2011              22
111  1      1/6/2011  2/1/2011          11

I want the output to be

111      1      1/1/2011      2/1/2011             11
111      1      1/7/2011      12/31/9999      11
111      2      1/6/2011      1/7/2011              22

logic for this is if a,b,c  are same if the end date and start date matches I want that in a single column

In above example In rows 1,2,5 a,b and c column matches and the end date of row 1 and start date of row 2  matches and end date of row 2 matches with start date of row 5 so I combined it to a single row

111      1      1/1/2011      2/1/2011             11

Can some one please help with the above logic

Thanks
0
vijay11
Asked:
vijay11
1 Solution
 
micropc1Commented:
You could try using CTE recusion to join the end dates to the start dates. Something like....

WITH myCTE (a, b, c, start, [end], lvl)
AS
(
	--dates with child (connecting) dates
	SELECT ta.a
		, ta.b
		, ta.c
		, start
		, [end]
		, 0 as lvl
	FROM myTable ta
	WHERE start NOT IN (SELECT [end] FROM myTable WHERE a=ta.a and b=ta.b and c=ta.c)
	
	UNION ALL
	
	SELECT tb.a
		, tb.b
		, tb.c
		, tc.[start] start
		, tb.[end] [end]
		, lvl + 1
	FROM myTable tb
	INNER JOIN myCTE tc
	ON tc.a = tb.a
	AND tc.b = tb.b
	AND tc.c = tb.c
	WHERE tb.start = tc.[end]
)

SELECT a, b, c, start, [end]
FROM from myCTE ta
WHERE lvl = (SELECT MAX(lvl) FROM myCTE where a=ta.a and b=ta.b and c=ta.c)

UNION ALL

--single start/end dates
SELECT ta.a
	, ta.b
	, ta.c
	, start
	, [end]
FROM myTable ta
WHERE start NOT IN (select [end] FROM myTable WHERE a=ta.a AND b=ta.b AND c=ta.c)
AND [end] NOT IN (select [start] FROM myTable WHERE a=ta.a AND b=ta.b AND c=ta.c)

Open in new window



Output...

a           b           c           start                   end
----------- ----------- ----------- ----------------------- -----------------------
111         1           11          2011-01-01 00:00:00.000 2011-02-01 00:00:00.000
111         1           11          2011-01-07 00:00:00.000 9999-12-31 00:00:00.000
111         1           22          2011-01-06 00:00:00.000 2011-01-07 00:00:00.000

Open in new window



Another alternative would be to use joins, but if you don't know how many dates there will be in a set that would be difficult...
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Get your problem seen by more experts

Be seen. Boost your question’s priority for more expert views and faster solutions

Tackle projects and never again get stuck behind a technical roadblock.
Join Now