查找山东大学或者性别为男生的信息
https://www.nowcoder.com/practice/979b1a5a16d44afaba5191b22152f64a
select device_id, gender, age, gpa from user_profile where university = '山东大学' union all select device_id, gender, age, gpa from user_profile where gender = 'male'
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查看4道真题和解析 
球球与墩墩：这不是前端常考的对象扁平化吗，面试官像是前端出来的
const flattern = (obj) => {
const res = {};
const dfs = (curr, path) => {
if(typeof curr === 'object' && curr !== null) {
const isArray = Array.isArray(curr);
for(let key in curr) {
const newPath = path ? isArray ? `${path}[${key}]` : `${path}.${key}` : key;
dfs(curr[key], newPath);
}
} else {
res[path] = curr
}
}
dfs(obj);
return res;
}查看3道真题和解析 