is it posible to make several relations between two tables in sql query ?

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for example two columns of table1 , have relation to the id column of table2

for example:

tbl_city: (id , title)
tbl_person: (id , name , CurrentCityID , LastCityID , ...)

now , I want to make two relations from tbl_person to tbl_city
CurrentCityID and LastCityID must relation to tbl_city

this query is wrong:

SELECT tbl_person.name , tbl_city.title , tbl_city.title
FROM tbl_person
JOIN tbl_city ON tbl_person.CurrentCityID = tbl_city.id
JOIN tbl_city ON tbl_person.LastCityID = tbl_city.id

can you help me ?

Posted 17-Apr-10 4:24am

H.R

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Sandeep Mewara · Answer 1 · 2010-04-17T04:31:00

Solution 1

Yes it is possible.

Try this:

SQL

SELECT tbl_person.name , tc1.title , tc2.title
FROM tbl_person
JOIN tbl_city tc1 ON tbl_person.CurrentCityID = tc1.id
JOIN tbl_city tc2 ON tbl_person.LastCityID = tc2.id

Posted 17-Apr-10 4:31am

Sandeep Mewara

Not Active · Answer 2 · 2010-04-17T04:33:00

Solution 2

You need to identify which table to return results from

SELECT tbl_person.name , C.title AS CurrentTitle, L.title AS LastCity
FROM tbl_person
JOIN tbl_city C ON tbl_person.CurrentCityID = C.id
JOIN tbl_city L ON tbl_person.LastCityID = L.id

Posted 17-Apr-10 4:33am

Not Active