diff --git a/2.2.cpp b/2.2.cpp
new file mode 100644
index 0000000..6c8d762
--- /dev/null
+++ b/2.2.cpp
@@ -0,0 +1,105 @@
+#include "MySQLWrapper.h"
+#include <iostream>
+#include <vector>
+#include <map>
+#include <set>
+#include <cstdlib>
+#include <cstdio>
+#include <cstring>
+#include <algorithm>
+#include <sstream>
+#include <fstream>
+using namespace std;
+
+#include "local_db_account.h"
+#include "util.hpp"
+
+int main()
+{
+    MySQLConn conn;
+    conn.connect("127.0.0.1",db_user,db_passwd,"bigdata3",3306);
+    conn.exec("set names gbk",nullptr);
+
+    /// 2.2 不同领域的平均薪资
+    vector<vector<string>> keywdvec
+    {
+        {
+            "大数据"
+        },
+        {
+            "程序开发","程序设计","开发"
+        },
+        {
+            "运维","运行维护","维护"
+        },
+        {
+            "测试"
+        }
+    };
+
+    map<string,vector<cash_pack>> mp;
+
+    int szArea=keywdvec.size();
+    for(int i=0;i<szArea;i++)
+    {
+        int szAlias=keywdvec[i].size();
+        for(int j=0;j<szAlias;j++)
+        {
+            ostringstream ostr;
+            ostr<<"select salary from lagou_job where ((title like '%"
+            <<keywdvec[i][j]<<"%') or (tags like '%"
+            <<keywdvec[i][j]<<"%'))";
+
+            conn.exec("use bigdata3",nullptr);
+            string sqlcmd=ostr.str();
+
+            conn.exec(sqlcmd,[&](MySQLResult& res)
+                      {
+                          res.stepRow([&](char** val,unsigned long* len)
+                                      {
+                                          cash_pack pk=ParseCash(val[0]);
+                                          mp[keywdvec[i][j]].push_back(pk);
+                                      });
+                      });
+
+            ostr.str("");
+            ostr<<"select salary from pages where ((title like '%"
+            <<keywdvec[i][j]<<"%') or (tags like '%"
+            <<keywdvec[i][j]<<"%'))";
+
+            sqlcmd=ostr.str();
+
+            conn.exec("use bigdata5",nullptr);
+            conn.exec(sqlcmd,[&](MySQLResult& res)
+                      {
+                          res.stepRow([&](char** val,unsigned long* len)
+                                      {
+                                          cash_pack pk=ParseCashX(val[0]);
+                                          mp[keywdvec[i][j]].push_back(pk);
+                                      });
+                      });
+        }
+    }
+
+    ofstream ofs("result/2.2.csv");
+    #define cout ofs
+    cout<<"行业,最低工资,最高工资,平均工资,数量"<<endl;
+    for(auto& pr:mp)
+    {
+        int sum=0;
+        int lowest=9999999;
+        int highest=-1;
+        int szVec=pr.second.size();
+        for(auto& pk:pr.second)
+        {
+            sum+=pk.ave();
+            lowest=min(lowest,pk.low);
+            highest=max(highest,pk.high);
+        }
+        sum/=szVec;
+        cout<<pr.first<<","<<lowest<<","<<highest<<","<<sum<<","<<szVec<<endl;
+    }
+    #undef cout
+
+    return 0;
+}