Question

Oracle Column Alias

Asked by: cutie_smily

Hi All,
 Why cant I use the column alias on the having clause or in the where clause. Am I missing anything or Oracle doesnt support aliases other than order by clause?

If I want to re-write the below query how can I do without re-summing the columns again in the having clause.

Thanks,

*****************************************************************************************
SELECT
    FILL_DATE,
    TRIM(D.GROUP_NBR) || TRIM(MEM.SUBSCRIBER_NBR) GRP_SUBS,
    PHR_NBR#,
    RX_NUM,
    REFILL,
    DRUG#,
    SUM(MTUNITS)                   SUM_MTUNITS,
    SUM(COPAY)                     SUM_COPAY,
    SUM(TOTAL_AMOUNT_DUE)          SUM_AMTDUE,
    SUM(DAYS_SUPPLY)               SUM_DAYSUPP,
    SUM(PROF_FEE)                  SUM_PROFFEE,
    SUM(ADD_COPAY)                 SUM_ADDCOPAY
   
FROM STG.DRUG D
LEFT OUTER JOIN STG.Member  MEM
ON TRIM(D.MEMBER) = MEM.CES_ALT_ID
WHERE
D.FILL_DATE BETWEEN MEM.EFF_DT AND MEM.END_DT AND
MEM.VOID_FLAG <> 'V'
GROUP BY
    FILL_DATE,
    TRIM(D.GROUP_NBR) || TRIM(MEM.SUBSCRIBER_NBR),
    PHR_NBR#,
    RX_NUM,
    REFILL,
    DRUG#
HAVING  SUM_COPAY <> 0 OR SUM_AMTDUE <> 0 OR SUM_MTUNITS <> 0

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Asked On
2007-10-01 at 08:45:15ID22863979
Tags

oracle

,

alias

,

column

Topics

Oracle 9.x

,

Oracle 8.x

,

Oracle 10.x

Participating Experts
2
Points
300
Comments
6

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Answers

 

by: johnsonePosted on 2007-10-01 at 08:52:36ID: 19991542

No, you cannot use an alias in a where or group by.

The technicality of it is that when the where clause and the group by clause are being executed, the select part of the query has not run and the alias has not been assigned.  Since the order by is technically done after the select the aliases can be used.

 

by: cutie_smilyPosted on 2007-10-01 at 08:56:04ID: 19991573

Thanks for making it clear. Please help in re-writing the query to achieve the same results.

 

by: johnsonePosted on 2007-10-01 at 09:28:27ID: 19991831

It looks like they were only in the HAVING.

SELECT
    FILL_DATE,
    TRIM(D.GROUP_NBR) || TRIM(MEM.SUBSCRIBER_NBR) GRP_SUBS,
    PHR_NBR#,
    RX_NUM,
    REFILL,
    DRUG#,
    SUM(MTUNITS)                   SUM_MTUNITS,
    SUM(COPAY)                     SUM_COPAY,
    SUM(TOTAL_AMOUNT_DUE)          SUM_AMTDUE,
    SUM(DAYS_SUPPLY)               SUM_DAYSUPP,
    SUM(PROF_FEE)                  SUM_PROFFEE,
    SUM(ADD_COPAY)                 SUM_ADDCOPAY
   
FROM STG.DRUG D
LEFT OUTER JOIN STG.Member  MEM
ON TRIM(D.MEMBER) = MEM.CES_ALT_ID
WHERE
D.FILL_DATE BETWEEN MEM.EFF_DT AND MEM.END_DT AND
MEM.VOID_FLAG <> 'V'
GROUP BY
    FILL_DATE,
    TRIM(D.GROUP_NBR) || TRIM(MEM.SUBSCRIBER_NBR),
    PHR_NBR#,
    RX_NUM,
    REFILL,
    DRUG#
HAVING  SUM(COPAY) <> 0 OR SUM(TOTAL_AMOUNT_DUE) <> 0 OR SUM(MTUNITS) <> 0

 

by: cutie_smilyPosted on 2007-10-01 at 10:10:57ID: 19992170

Thanks. My question was how can we achieve this without summing the columns twice.

 

by: johnsonePosted on 2007-10-01 at 11:58:13ID: 19993097

You are not summing the columns twice.  It only sums the columns once.  The having is a check after the fact.

 

by: nav_kum_vPosted on 2007-10-01 at 14:49:57ID: 19994502

You can do it as shown below :

select * -- pick only whatever columns you need from inner columns which are existing
from
(
SELECT
    FILL_DATE,
    TRIM(D.GROUP_NBR) || TRIM(MEM.SUBSCRIBER_NBR) GRP_SUBS,
    PHR_NBR#,
    RX_NUM,
    REFILL,
    DRUG#,
    SUM(MTUNITS)                   SUM_MTUNITS,
    SUM(COPAY)                     SUM_COPAY,
    SUM(TOTAL_AMOUNT_DUE)          SUM_AMTDUE,
    SUM(DAYS_SUPPLY)               SUM_DAYSUPP,
    SUM(PROF_FEE)                  SUM_PROFFEE,
    SUM(ADD_COPAY)                 SUM_ADDCOPAY    
FROM STG.DRUG D
LEFT OUTER JOIN STG.Member  MEM
ON TRIM(D.MEMBER) = MEM.CES_ALT_ID
WHERE
D.FILL_DATE BETWEEN MEM.EFF_DT AND MEM.END_DT AND
MEM.VOID_FLAG <> 'V'
GROUP BY
    FILL_DATE,
    TRIM(D.GROUP_NBR) || TRIM(MEM.SUBSCRIBER_NBR),
    PHR_NBR#,
    RX_NUM,
    REFILL,
    DRUG# )
where SUM_COPAY <> 0 OR SUM_AMTDUE <> 0 OR SUM_MTUNITS <> 0;

You can refer to any of the columns inside the inline view which can be
in the select list, where clause, group by , having, order etc.

This is just to show you that we can use inline views to consider the
data returned as a table itself but not real table.

Thanks

20120131-EE-VQP-002

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