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Query

thread220-1542682

Query

Query

(OP)
Hi,

I have the following result from a select statement:

Column: A  B  C
Data  : 55 S  123
Data  : 55 T  123
Data  : 09 S  123
Data  : 09 T  123

I am new to SQL and I cannot figure out a way to do the following: "If there are rows with same values in Column A, select the rows with 'T' in column B."

Your help is greatly appreciated. Thanks.   

RE: Query

(OP)
Thanks for your reply. My example is not a table, it is a result of the select statement. Probably I should create a view and try again.

Column: A  B  C
Data  : 55 S  123
Data  : 55 T  123
Data  : 55 Z  123
Data  : 09 S  123
Data  : 09 T  123
Data  : 09 S  123

Just for clarification: I want to do is "if there are rows with same Column A value, select the last row."
 

RE: Query

(OP)
Sorry for the confusion.

Column: A  B  C
Data  : 55 S  123
Data  : 55 T  123
Data  : 55 Z  123
Data  : 09 S  123
Data  : 09 T  123
Data  : 09 S  123

I sorted the result so what I want is "55 Z  123" and "09 S  123" out of the above table. I have created a view so the original statement does not matter I guess. Thanks a lot for your help.

RE: Query

(OP)
"55 Z  123" is the last row with 55 in Column A, then "09 S  123" is the last row with 09 in Column A. They are sorted by Column A and then Process_Time(let's say it's in Column D). Thanks.
 

RE: Query

ah, the old familiar "hidden column D i forgot to mention" trick winky smile

CODE

SELECT q.A
     , q.B
     , q.C
  FROM ( SELECT A
              , MAX(D) AS latest
           FROM queryresult
         GROUP
             BY A ) AS m
INNER
  JOIN queryresult AS q
    ON q.A = m.A
   AND q.D = m.latest
please let me know if that works for you
 

r937.com | rudy.ca
Buy my new book Simply SQL from Amazon

RE: Query

(OP)
Thanks PHV and r937.  

RE: Query

(OP)
r937, thanks. Your code works.  

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