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Oracle SQL-Anweisung in java

Hinweis:Diese Antwort gilt für die ursprüngliche Frage.

SQL-Anweisung mit Anmerkungen:

select a.name           -- 'a' is undefined
     , ird_num          -- note: always qualify (helps others read it)
     , loan_num         --   same
     , contract_date    --   same
  from a2_loan          -- is this support to have alias 'a'?
     , customer b       -- not table `a2_customer`
     , customer c       -- not table `a2_customer`
 where aname=b.ird_num  -- missing period(?), and 'a' is undefined
   and b name=c.name    -- missing period