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Last record chosen in Oracle Query

Posted on 2016-10-19
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Last Modified: 2016-10-20
I need to only retrieve the last record when this Oracle 9.2 query executes.

DI  2016-09-26  168398    063848979   //SRC RMS


I would also like another Oracle query that only retrieves the first record.

NULL      DI  2016-09-16  174261    063848979   //SRC RMS             FB BRAMPTON TO

Right now,  the query will retrieve 3 records for this problem when it executes.
The 1993237 will be a field once I get it to work.
This Oracle query executes inside a SQL query.




SELECT (CASE WHEN TO_CHAR(aa.NOTES)  IS NOT NULL  THEN  TO_CHAR(aa.NOTES)  ELSE TO_CHAR(a.PTEXT) END) as MyNote
FROM            GPCOMP1.GPPROB a, GPCOMP1.GPPROBNOTES aa
WHERE        a.PROBLEM_ID = aa.PROB_ID AND (a.PROBLEM_ID = 1993237)
ORDER BY a.MODIFIED_ON DESC




 Oracle Query
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Comment
Question by:thayduck
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3 Comments
 
LVL 78

Accepted Solution

by:
slightwv (䄆 Netminder) earned 2000 total points
ID: 41850949
First row:
select mynote from (
SELECT (CASE WHEN TO_CHAR(aa.NOTES)  IS NOT NULL  THEN  TO_CHAR(aa.NOTES)  ELSE TO_CHAR(a.PTEXT) END) as MyNote,
row_number() over(order by modified_on asc) rn
 FROM            GPCOMP1.GPPROB a, GPCOMP1.GPPROBNOTES aa
 WHERE        a.PROBLEM_ID = aa.PROB_ID AND (a.PROBLEM_ID = 1993237)
)
where rn=1


Last row:
select mynote from (
SELECT (CASE WHEN TO_CHAR(aa.NOTES)  IS NOT NULL  THEN  TO_CHAR(aa.NOTES)  ELSE TO_CHAR(a.PTEXT) END) as MyNote,
row_number() over(order by modified_on desc) rn
 FROM            GPCOMP1.GPPROB a, GPCOMP1.GPPROBNOTES aa
 WHERE        a.PROBLEM_ID = aa.PROB_ID AND (a.PROBLEM_ID = 1993237)
)
where rn=1


I'm guessing that really isn't what you want.  Can you provide some sample data and exepected results?
0
 

Author Comment

by:thayduck
ID: 41852218
Your code did exactly what I wanted.

 I did have to change :

 row_number() over(order by modified_on desc) rn

 TO

 row_number() over(order by a.modified_on desc) rn


 Thank you for the quick response.
0
 
LVL 78

Expert Comment

by:slightwv (䄆 Netminder)
ID: 41852228
No problem.  Glad to help.
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