이걸 지피티, 클로우드, 제미나이, 그록 다 오답이고 네이버 ai 만 맞추네요

1번과 2번중 에러 나는것은?

====================

1번.

map.put("a", 1);

map.put("b", null);

moMapper.selectEx(map);

<select id="selectEx" resultType="Map" parameterType="Map">

SELECT #{a} as aaa from dual

union all

SELECT #{b} as aaa from dual

</select>

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2번

map.put("a", "aaa");

map.put("b", null);

moMapper.selectEx(map);

<select id="selectEx" resultType="Map" parameterType="Map" >

SELECT #{a} as aaa from dual

union all

SELECT #{b} as aaa from dual

</select>