Can I use… over(… exclude no others)

Exclude no others is the optional clause for the default behaviour to keep all rows as defined by the frame:

SELECT SUM(x) OVER(ORDER BY val … EXCLUDE NO OTHERS)
  FROM …

Related

• Other frame exclude options: current row, group, ties

• Tutorial: Window Frame Exclusion

• Other forms: window clause

Normative References

The exclude clause in window definitions—both, in over and window clauses—is defined in ISO/IEC 9075:2016-2 as part of optional feature T612, “Advanced OLAP operations”.