individual SQL select queries vs single big SQLselect query: what is better & why?
I have these three separate queries,

    SELECT packageid from tblhosting where userid=1234 AND id=4351
    SELECT id FROM tblcustomfields WHERE relid =tblhosting.packageid AND fieldname ='foo'
    SELECT value FROM  `tblcustomfieldsvalues` WHERE  `fieldid` =tblcustomfields.id AND relid=tblhosting.id

currently, these are separate queries. does it make sense to combine them into single query? if yes, then why & how should one combine this? 
individual SQL select queries vs single big SQLselect query: what is better & why?
===

I have these three separate queries,

    SELECT packageid from tblhosting where userid=1234 AND id=4351
    SELECT id FROM tblcustomfields WHERE relid =tblhosting.packageid AND fieldname ='foo'
    SELECT value FROM  `tblcustomfieldsvalues` WHERE  `fieldid` =tblcustomfields.id AND relid=tblhosting.id

currently, these are separate queries. does it make sense to combine them into single query? if yes, then why & how should one combine this? 