Question

This is continuing on from a query that was solved previously via stackoverflow (Returning nearest date to date in a different table), however, I now wish to develop it a little further.

The SQL I have is this:

SELECT *
FROM (SELECT O_ASSESSMENTS.ASM_SUBJECT_ID as "P Number", 
             O_ASSESSMENTS.ASM_ID as "Assessment ID", 
             O_ASSESSMENTS.ASM_START_DATE as "Assessment Start",  
             O_ASSESSMENTS.ASM_END_DATE as "Assessment End", 
             O_SERVICE_EVENTS.SEV_ID as "Event ID", 
             O_SERVICE_EVENTS.SEV_ACTUAL_DATE as "Event Start", 
             O_SERVICE_EVENTS.SEV_OUTCOME_DATE as "Event End",
             ROUND(O_ASSESSMENTS.ASM_START_DATE -O_SERVICE_EVENTS.SEV_ACTUAL_DATE,0) as "Likely",
             row_number() over(PARTITION BY  O_ASSESSMENTS.ASM_ID                                    
                               ORDER BY abs(O_ASSESSMENTS.ASM_START_DATE -  O_SERVICE_EVENTS.SEV_ACTUAL_DATE))as "Row Number"            
      FROM O_ASSESSMENTS 
      JOIN O_SERVICE_EVENTS
        ON O_ASSESSMENTS.ASM_SUBJECT_ID = O_SERVICE_EVENTS.SEV_SUBJECT_ID
      Where O_SERVICE_EVENTS.SEV_CODE IN ('ICS_E3','CPINVEST') AND 
            O_ASSESSMENTS.ASM_QSA_ID  IN ('AA1329','AA521') )
WHERE "Row Number" = 1

Basically, we have two tables – o_assessments and o_service_events, and this SQL is returning the nearest service event to the assessment. Now I want to include some more contexual information into the query to make it more helpful for the end user – namely the team name and the worker name.

Unfortunately, team and worker are in a different table again (o_responsibilities), and are linked to the o_assessments by asm_id to res_rec_id.

Problem is, I’m really not sure how to call this table into the above sql – so any advice would really be appreciated!

I was also wondering if it would be possible to tweak the existing query to only return corresponding events when the ‘likely’ field had a difference of 0 (as anything greater is probably not related to that particular assessment). I know I can add it into the where, but if I add the line

and "Likely" = 0

it only returns assessments with an event, which wouldn’t highlight any issues (i.e. assessments without corresponding events).

I’m learning all the time with SQL, but there are a lot of things that just seem really beyond me at the moment, so any advice is much appreciated! I wasn’t sure whether to amend my original query or to start a new one, so I hope I haven’t infringed on any rules inadvertently.

Edit:

Okay, following Mark’s solution, this is what I have working.

SELECT 
* 
FROM 
(SELECT 
OAS.ASM_SUBJECT_ID as "P Number",
OAS.ASM_ID as "Assessment ID",
OAS.ASM_START_DATE as "Assessment Start", 
OAS.ASM_END_DATE as "Assessment End",
OAS.ASM_AUTH_DATETIME as "Authorisation Date",
nvl(olm_bo.get_ref_desc(OAS.ASM_OUTCOME,'ASM_OUTCOME'),'') as "Outcome",
nvl(olm_bo.get_org_name(ORE.RES_PARTY_OUN_ID),'') as "Team",
nvl(olm_bo.get_per_name(ORE.RES_PARTY_ID),'') as "Worker",
OSE.SEV_ID as "Event ID",
OSE.SEV_ACTUAL_DATE as "Event Start",
OSE.SEV_OUTCOME_DATE as "Event End",
ROUND(OAS.ASM_START_DATE -OSE.SEV_ACTUAL_DATE,0) as "Likely",
row_number() over(PARTITION BY  OAS.ASM_ID                   
ORDER BY 
abs(OAS.ASM_START_DATE -  OSE.SEV_ACTUAL_DATE))as "Row Number"
FROM O_ASSESSMENTS OAS      
INNER JOIN O_RESPONSIBILITIES ORE ON OAS.ASM_ID = ORE.RES_REC_ID
AND ORE.RES_PARTY_OUN_ID = 'TEAM'
LEFT JOIN O_SERVICE_EVENTS OSE ON OAS.ASM_SUBJECT_ID = OSE.SEV_SUBJECT_ID 
AND            
OSE.SEV_CODE IN ('EVENT') 
AND             
ROUND(OAS.ASM_START_DATE - OSE.SEV_ACTUAL_DATE,0) >= -7
AND
ROUND(OAS.ASM_START_DATE - OSE.SEV_ACTUAL_DATE,0) <= 7
Where OAS.ASM_QSA_ID  IN ('ACODE')
AND
nvl(olm_bo.get_ref_desc(OAS.ASM_OUTCOME,'ASM_OUTCOME'),'') <> 'Abandon' ) WHERE "Row Number" = 1 

Answer 1

Try:

SELECT *
FROM (SELECT OAS.ASM_SUBJECT_ID as "P Number", 
             OAS.ASM_ID as "Assessment ID", 
             OAS.ASM_START_DATE as "Assessment Start",  
             OAS.ASM_END_DATE as "Assessment End", 
             ORE.TEAM,
             ORE.WORKER,
             OSE.SEV_ID as "Event ID", 
             OSE.SEV_ACTUAL_DATE as "Event Start", 
             OSE.SEV_OUTCOME_DATE as "Event End",
             ROUND(OAS.ASM_START_DATE -OSE.SEV_ACTUAL_DATE,0) as "Likely",
             row_number() over(PARTITION BY  OAS.ASM_ID                                    
                               ORDER BY abs(OAS.ASM_START_DATE -  OSE.SEV_ACTUAL_DATE))as "Row Number"            
      FROM O_ASSESSMENTS OAS
      LEFT JOIN O_RESPONSIBILITIES ORE
        ON OAS.ASM_ID = ORE.RES_REC_ID
      LEFT JOIN O_SERVICE_EVENTS OSE
        ON OAS.ASM_SUBJECT_ID = OSE.SEV_SUBJECT_ID AND
           OSE.SEV_CODE IN ('ICS_E3','CPINVEST') AND 
           ROUND(OAS.ASM_START_DATE - OSE.SEV_ACTUAL_DATE,0) = 0
      Where OAS.ASM_QSA_ID  IN ('AA1329','AA521') )
WHERE "Row Number" = 1

Note that this assumes that RES_REC_ID is a unique identifier on O_RESPONSIBILITIES.