Joins in Cognos Question

SELECT  LN_EVNTDATE_1.LNKEY 
      , LN_EVNTDATE_1.IDX 
      , LN_MTGTERMS.APP_DATE 
      , LN_DOCGEN.SETTLEMENT_DATE 
      , LN_MTGTERMS.CONTRACTDATE 
      , U_LN_POST_CLOSING.U_REVIEW_STARTED 
      , U_LN_POST_CLOSING.U_REVIEW_COMPLETED 
      , DAYS(CURRENT DATE) -...