DISABLE TRIGGER ALL ON T_ORARENDIORA
GO

UPDATE oo
SET
    C_ORAKEZDETE = ISNULL(csro.C_KEZDETE, '20000101 00:00:00')
    ,C_ORAVEGE = ISNULL(csro.C_VEGE, '20000101 00:00:00')
FROM T_ORARENDIORA oo
LEFT JOIN T_CSENGETESIRENDORA csro ON
    csro.ID = oo.C_CSENGETESIRENDORAID AND csro.C_INTEZMENYID = oo.C_INTEZMENYID AND csro.C_TANEVID = oo.C_TANEVID