Question

What is the best and simplets way to save two values from two different select statements?

I have a query that’s like this:

SELECT * FROM (
SELECT FIELD1 FROM (<SUB SELECT STATMENT>)
UNION ALL
SELECT FIELD2 FROM (<SUB SELECT STATMENT>)) 

What I’d like is to save the value from FIELD1 and FIELD2 so later I can do some calulation with it, such as FIELD1 / FIELD2. I tried using a cursor but ran into issues. And it’s too complicated for select statement. Any suggestions?

UPDATE:

The result set from my current query looks like this.

SUM_OF_MESSAGES  | LABEL
----------------------------
      145323     | PUSHED
      2633267    | RECEIVED
                 |

I’d like to take the values from the first two rows and divide them. Eg. 145323 / 2633267

In other words, is there a way to divide FIELD1 by FIELD2 from my above query?

ANOTHER UPDATE:

Here is my query:

SELECT SUM(R.MESSAGES) AS SUM_OF_MESSAGES, CASE WHEN R.LABEL = 1 THEN 'PUSHED' WHEN R.LABEL = 2 THEN 'RECEIVED' END AS LABEL FROM (                
SELECT SUM(Q.MESSAGES) AS "MESSAGES", 1 LABEL FROM (
SELECT USER_LOGIN,
                 EVENT_MSG,
                 ROW_LST_UPD_TS,
                 COMPONENT_NAME,
                 REGEXP_SUBSTR (SUBSTR (EVENT_MSG, INSTR (EVENT_MSG, ' ', 1, 1), INSTR (EVENT_MSG, ' ', 1, 1)), '[0-9]+') AS "MESSAGES"
            FROM EVENT_MGT.EVENT_LOG
            WHERE ROW_LST_UPD_TS BETWEEN (TRUNC (:DATEINPUT) - 1) + 5 / 86400 AND (TRUNC (:DATEINPUT)) + 5 / 86400
                 AND EVENT_ID = 101
                 AND COMPONENT_NAME LIKE '%Web ICE Downloader.exe%'
        GROUP BY COMPONENT_NAME,
                 USER_LOGIN,
                 EVENT_MSG,
                 ROW_LST_UPD_TS
                 ORDER BY ROW_LST_UPD_TS ) Q         
UNION ALL           
SELECT SUM(Q.MESSAGES) "MESSAGES", 2 LABEL FROM (
SELECT USER_LOGIN,
                 EVENT_MSG,
                 ROW_LST_UPD_TS,
                 COMPONENT_NAME,
                 REGEXP_SUBSTR (SUBSTR (EVENT_MSG, INSTR (EVENT_MSG, ' ', 1, 1), INSTR (EVENT_MSG, ' ', 1, 1)), '[0-9]+') AS "MESSAGES"
            FROM EVENT_MGT.EVENT_LOG
            WHERE ROW_LST_UPD_TS BETWEEN (TRUNC (:DATEINPUT) - 1) + 5 / 86400 AND (TRUNC (:DATEINPUT)) + 5 / 86400
                 AND EVENT_ID = 100
                 AND COMPONENT_NAME LIKE '%Web ICE Downloader.exe%'
        GROUP BY COMPONENT_NAME,
                 USER_LOGIN,
                 EVENT_MSG,
                 ROW_LST_UPD_TS
                 ORDER BY ROW_LST_UPD_TS ) Q ) R
                 GROUP BY  R.LABEL

Here is my result set:

SUM_OF_MESSAGES  | LABEL
----------------------------
      145323     | PUSHED
      2633267    | RECEIVED
                 |

I’d like to divide the two numbers in the same select statement. Please help.

Answer 1

It seems like you would only need one query with a bit of logic in your aggregates

      SELECT COUNT( CASE WHEN event_id = 100 
                         THEN q.messages
                         ELSE null
                     END) Received,
             COUNT( CASE WHEN event_id = 101
                         THEN q.messages 
                         ELSE null
                     END) Pushed,
             COUNT( CASE WHEN event_id = 101
                         THEN q.messages 
                         ELSE null
                     END) /
                COUNT( CASE WHEN event_id = 100 
                           THEN q.messages
                           ELSE null
                       END) Pushed_Over_Received
        FROM (
          SELECT USER_LOGIN,
                 EVENT_ID,
                 EVENT_MSG,
                 ROW_LST_UPD_TS,
                 COMPONENT_NAME,
                 REGEXP_SUBSTR (SUBSTR (EVENT_MSG, INSTR (EVENT_MSG, ' ', 1, 1), 
                 INSTR (EVENT_MSG, ' ', 1, 1)), '[0-9]+') AS "MESSAGES"
            FROM EVENT_MGT.EVENT_LOG
            WHERE ROW_LST_UPD_TS BETWEEN (TRUNC (:DATEINPUT) - 1) + 5 / 86400 
                                     AND (TRUNC (:DATEINPUT)) + 5 / 86400
              AND EVENT_ID in( 100, 101 )
              AND COMPONENT_NAME LIKE '%Web ICE Downloader.exe%'
        )

Alternately, you could do something like this with analytic functions (you’d want to replace the subquery t in my query with the query you’ve written that produces the two rows of output)

SQL> ed
Wrote file afiedt.buf

  1  with t as (
  2    select 145323 sum_of_messages, 'PUSHED' label from dual
  3    union all
  4    select 2633267, 'RECEIVED' from dual
  5  )
  6  select sum_of_messages,
  7         label,
  8         round( 100*ratio_to_report(sum_of_messages) over (), 2) pct_of_messages
  9*   from t
SQL> /

SUM_OF_MESSAGES LABEL    PCT_OF_MESSAGES
--------------- -------- ---------------
         145323 PUSHED              5.23
        2633267 RECEIVED           94.77