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Simple query

Author

Topic

salmoliv
Starting Member

2 Posts

Posted - 2010-08-23 : 10:58:05

I have a table recording changes, with few fields

CHANGES
- ID
- FROM
- TO

The FROM and TO fields contains IDs pointing to a different table, STATES.

STATES
- ID
- NAME

I would like to have a query returning all my changes with the state name instead of the state ids

So, if I have in my CHANGES table and in My STATES tables the followings:
CHANGES
0 0 1
1 0 2

STATES
0 New
1 Closed
2 Returned

I would like the query to return:
0 New Closed
1 New Returned

Thank you

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2010-08-23 : 11:07:12

select c.id, s1.name, s2.name
from Changes as c
left join states as s1 on s2.id = c.from
left join states as s2 on s2.id = c.to

N 56°04'39.26"
E 12°55'05.63"

salmoliv
Starting Member

2 Posts

Posted - 2010-08-23 : 17:02:57

Thank you,

I think the correct query should be:

select c.id, s1.name, s2.name
from Changes as c
left join states as s1 on s1.id = c.from
left join states as s2 on s2.id = c.to

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2010-08-24 : 07:22:14

why do you need LEFT JOIN? I think seeing your sample data INNER JOIN is enough

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

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