qlikview with salesforce ID matching by aliasing

[#1]

I know that for fields to be associated,the fields must have same name.I am using salesforce and in the script i wrote this:

sql select id as periodID,......from period__c;

sql select name as PeriodID,..... from Expenses__c;

because i want to associate name from one table to id of the other table,as name from expenses is a look-up to id from period__c.The type is same.But the script terminates with an error,i think it does allow aliasing.How can i achieve this by skipping aliasing.

[#2]

yupi,i got it to work. the solution is this:

select transaction__c, category__c,Period__c,Montant__c, Date__c From expense__c ;

Load Period__c as Id,transaction__c, category__c,Period__c,Montant__c, Date__c

Resident expenses;

drop table expenses;

thus the Period__c field now will have the name Id and is associated to the field Id of the table Period__c