Can we use joins in webservice queries?

[joebordes]

Yes, you can but not the typical SQL join. The application knows how to setup the joins so you basically ask for what you need. For example:

select potentialname,Accounts.accountname from Potentials

it will know how to join potentials and accounts to get the name.

You can find some examples, with the resulting SQL here:

https://github.com/tsolucio/coreBOSTests/blob/master/include/Webservices/VtigerModuleOperation_QueryTest.php#L138