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select json_object(key 'a' value 1, key 'b' value null null on null) c1 ,(SELECT json_object(key 'a' value 1, key 'b' value null absent on null) FROM dual) c2 from dual
C1
C2
{"a":1,"b":null}
{"a":1}
select json_object(key 'a' value 1, key 'b' value null null on null) c1, json_object(key 'a' value 1, key 'c' value null absent on null) c2 from dual;
C1
C2
{"a":1,"b":null}
{"a":1}