Comparing dates abap

i'm convert this condition:

LOOP AT gt_zgd_check_smc_st INTO gs_zgd_check_smc_st
    SELECT *
      FROM ever
      INTO wa_ever
      WHERE anlage  EQ wa_euiinstln-anlage
      AND   einzdat <= wa_zgd_check_smc_st-data_inizio
      AND   auszdat >= wa_zgd_check_smc_st-data_inizio.
    ENDSELECT.
    IF sy-subrc NE 0.
-code error--
ENDIF.
   ENDLOOP.

But client not like beacuse is more slowly and i changing it in:

LOOP AT gt_zgd_check_smc_st INTO gs_zgd_check_smc_st

 READ TABLE gt_ever INTO gs_ever WITH KEY anlage = gs_euiinstln-anlage.

  IF sy-subrc = 0.

            IF gs_ever-einzdat ?? gs_zgd_check_smc_st-start_date  "date
           AND gs_ever-auszdat ?? gs_zgd_check_smc_st-start_date. "date

         --CODE WITH RECORD ERROR--

   ELSE.
         --- CODE WITH RECORD ERROR ---
      ENDIF.

   ENDLOOP.

I don't know whitch operatore to insert after einzdat and auszdat so it works as SELECT-ENDSELECT. PS.GT_EVER is in FOR ALL ENTRIES with anlage of EUIINSTLN.

thank you all regards.