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9.1

Need to optimize a query

Asked by slightwv in Oracle SCM, Databases Miscellaneous, SQL Query Syntax

Tags: database query

I've been staring at this to long and give up.  I might be able to change/create the tables if necessary but I'd rather not.

Using Oracle 10.2.

Given a table of marriage_states (simplified of course):
create table tab1 (husband_state char(2), wife_state char(2));

insert into tab1 values('AL','WA');
insert into tab1 values('AL','NY');
insert into tab1 values('ND','AL');
insert into tab1 values('AL','AL');
insert into tab1 values('AL','AL');
insert into tab1 values('AL','AL');
commit;

What I would like from a single query (it's for a report) is:
- Husbands from AL with wives not from AL
- Wives from AL with husbands not from AL
- Couples where both are from AL

results
----------------------
Husbands 2
Wives 1
Couples 3


Best I can think of now involves 3 full table scans with 2 unions.

select 'Husbands', count(*) from tab1 where husband_state='AL and wife_state != 'AL
union
select 'Wives', count(*) from tab1 where husband_state!='AL and wife_state = 'AL
union
select 'Couples', count(*) from tab1 where husband_state='AL and wife_state = 'AL


[+][-]06/11/09 04:44 PM, ID: 24607987Accepted Solution

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Zones: Oracle SCM, Databases Miscellaneous, SQL Query Syntax
Tags: database query
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Solution Provided By: lwadwell
Participating Experts: 2
Solution Grade: A
 
[+][-]06/11/09 04:45 PM, ID: 24607998Expert Comment

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[+][-]06/11/09 04:50 PM, ID: 24608021Author Comment

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[+][-]06/11/09 04:54 PM, ID: 24608047Expert Comment

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[+][-]06/11/09 05:21 PM, ID: 24608202Author Comment

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