FUNCTION UseOpenBase() 
 ... 
    IF ( lDbfNo := ! File( cDbf+'.dbf' ) )  
       AAdd( aStr, { 'F0', '+',  4, 0 } )  
       AAdd( aStr, { 'F1', 'D',  8, 0 } )  
       AAdd( aStr, { 'F2', 'C', 60, 0 } )  
       AAdd( aStr, { 'F3', 'N', 10, 2 } )  
       AAdd( aStr, { 'F4', 'L',  1, 0 } )  
       dbCreate( cDbf, aStr )  
    ENDIF  
 ... 
       WHILE TEST->( RecCount() ) < 20 // 10 
          TEST->( dbAppend() )  
          TEST->F1 := Date() + n++  
 ... 
    USE ( cDbf ) ALIAS "TEST" SHARED NEW  
    OrdSetFocus('NN')  
    GO TOP  
  
    COPY TO ( '_1' ) FOR ','+hb_ntos(RecNo())+',' $ ',3,5,7,11,15,' 
    GO TOP  
    COPY TO ( '_2' ) FOR ','+hb_ntos(RecNo())+',' $ ',2,4,6,10,14,' 
    GO TOP  
  
    USE ( '_2' ) ALIAS T1 NEW  
    GO TOP 
    ? '_2.dbf', T1->( LastRec() ) 
    WHILE ! EOF() 
       ? RecNo(), T1->F0, T1->F1 
       SKIP 
    ENDDO 
    USE 
    ? 
    USE ( '_1' ) ALIAS T1 NEW  
    GO TOP 
    ? '_1.dbf', T1->( LastRec() ) 
    WHILE ! EOF() 
       ? RecNo(), T1->F0, T1->F1 
       SKIP 
    ENDDO 
    dbAppend() 
    dbSkip(0) 
    APPEND FROM ( '_2' ) 
    dbGoBottom() 
    dbAppend() 
    GO TOP 
    ? '_1.dbf+_2.dbf', T1->( LastRec() ) 
    WHILE ! EOF() 
       ? RecNo(), T1->F0, T1->F1, iif(empty(T1->F1), 'New', '' ) 
       SKIP 
    ENDDO 
    USE 
  
    SELECT TEST 
 ... 
 Результат: 
 _2.dbf	5	 
 1	2	24.01.2019	 
 2	4	26.01.2019	 
 3	6	28.01.2019	 
 4	10	01.02.2019	 
 5	14	05.02.2019	 
  
 _1.dbf	5	 
 1	3	25.01.2019	 
 2	5	27.01.2019	 
 3	7	29.01.2019	 
 4	11	02.02.2019	 
 5	15	06.02.2019	 
 _1.dbf+_2.dbf	12	 
 1	3	25.01.2019	''	 
 2	5	27.01.2019	''	 
 3	7	29.01.2019	''	 
 4	11	02.02.2019	''	 
 5	15	06.02.2019	''	 
 6	21	  .  .    	New	 
 7	22	24.01.2019	''	 
 8	23	26.01.2019	''	 
 9	24	28.01.2019	''	 
 10	25	01.02.2019	''	 
 11	26	05.02.2019	''	 
 12	27	  .  .    	New