next baby step in SQL: start using join

I'm somewhat of an experienced simple user of SQL, i.e., never done any joins.

I am now have what appears to be a perfect opportunity to use SQL join to 
greatly simplify my
coding.  Knowing that one can use Retrieve Query Mgmt Query (RTVQMQRY) to take 
a *QRYDFN and
generate the SQL via ALWQRYDFN(*YES), I use WRKQRY to set up the query, get it 
working the way I
want it to, save the *QRYDFN, and use RTVQMQRY to generate the SQL.

So, I am surprised to see that the generated SQL doesn't have any Join clauses 
(?) but, instead,
does the join via WHERE, i.e.:
 FROM      PQPROD/PESTCCP T01, 
           PQPROD/PTBLCCP T02, 
           PQPROD/PJOBHDR T03  
 WHERE     T03.CMPNUM = T02.CMPNUM 
   AND     T01.CCPTYP = T02.TBLID  
   AND     T01.CCPNUM = T02.CCPNUM 
   AND     T01.JOBNUM = T03.JOBNUM 
   AND(    T01.JOBNUM = 'TACM0170' 
   AND     T02.CSTTYP = 'C')       

The join in WRKQRY

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