We help IT Professionals succeed at work.

We've partnered with Certified Experts, Carl Webster and Richard Faulkner, to bring you two Citrix podcasts. Learn about 2020 trends and get answers to your biggest Citrix questions!Listen Now

x

Complicated CASE statement... is this possible?

SOMCEE
SOMCEE asked
on
Medium Priority
278 Views
Last Modified: 2008-02-01
Hello,

  I don't know if there is any way to do this but I hope so....

In the CASE statement below on the first CASE statement where I am returning a different table column (CLLABS.TCOMMENT)... What I really need to return is the TCOMMENT field for the next two rows of data... In other words I don't need the TCOMMENT field for that row, I need it for the 2 following rows beneath it.  Is this possible, and if so how would it be done? Thanks!

SELECT LEFT(OBSERVE_DESC,40),  
CASE
WHEN LEFT(OBSERVE_DESC,15)= 'INTERPRETATION:' THEN CLLABS.TCOMMENT
WHEN LEFT(OBSERVE_VALUE,15)= 'NON-REACTIVE' THEN 'NR'
WHEN LEFT(OBSERVE_VALUE,8)= 'see note' THEN 'KWK Note'
WHEN LEFT(OBSERVE_VALUE,3)= 'DNR' THEN NULL
ELSE LEFT(OBSERVE_VALUE,25) END,
LTRIM(CAST(DATEIN AS CHAR(12)))  
FROM CLLABS WHERE COMPANY='MASH' AND SSNO='146223'

Comment
Watch Question

CERTIFIED EXPERT

Commented:
Hi SOMCEE,

try something like a self join where you return 3 rows in one long row then use the case to get the cols you want
When you say "next two rows" that is meaningless unless you have an order by statement. You could be getting a default sort based on a clustered index, but that's not a good way to work. Is there a column that lets you know which rows belong together? You need that to follow regbes suggestion, which should work.

Commented:
Yes, it's possible, and would look something like this:

...
THEN CLLABS_2.TCOMMENT + ' ' + CLLABS_3.TCOMMENT
...
FROM CLABS as CLABS,
          CLABS as CLABS_2.
          CLABS as CLABS_3
WHERE COMPANY='MASH' AND SSNO='146223'
AND

a set of conditions to tie the first, second, and third lines together. With the info given, I can only offer conjecture but it go something like:

AND CLABS_2.COMPANY = CLABS.COMPANY
AND CLABS_3.COMPANY = CLABS.COMPANY
AND CLABS_2.SSNO = CLABS.SSNO
AND CLABS_3.SSN = CLABS.SSN
AND CLABS_2.SomeSeqNumber = CLABS.SomeSeqNumber + 1
AND CLABS_3.SomeSeqNumber = CLABS.SomeSeqNumber + 2


Saying you want the "following two rows", is sort of undefined.  The trick is explaining precisely how to identify those two rows in an SQL sense.  


 
   

Commented:
Drat, just noticed typo. Should have used a comma, not a period on the FROM clause

Author

Commented:
dqmg,

  Yes actually I forgot to mention that there are a couple of columns used to determine what rows go together... They are TSEQUENCE and TSUBSEQ, where in this case TSEQUENCE is alway 2 and then TSUBSEQ is 0, 1 and 2 respectively... so I believe your above example would work... Thanks!

Commented:
OK, then try this:

THEN CLLABS_2.TCOMMENT + ' ' + CLLABS_3.TCOMMENT
...
FROM CLlABS as ClLABS,
          CLlABS as ClLABS_2,
          CLlABS as CLlABS_3
WHERE CLLABS.COMPANY='MASH' AND CLLABS.SSNO='146223'
AND CLlABS_2.TSEQUENCE = TSEQUENCE
AND CLlABS_3.TSEQUENCE = TSEQUENCE
AND CLlABS.TSUBSEQ = 0      
AND CLlABS_2.TSUBSEQ = CLlABS.TSUBSEQ + 1
AND CLlABS_3.TSUBSEQ = CLlABS.TSUBSEQ + 2

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts
Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.