当sql语句中从两表中查询的两列模糊时，如何处理

string wax = comboBox1.Text + comboBox2.Text + comboBox3.Text;string s=comboBox1.Text+comboBox2.Text+comboBox3.Text;
SQLiteDataAdapter mAdapter = new SQLiteDataAdapter("select " + wax + ",para," + s + " from 电缆参数,电缆参数1", m);             
chart2.Series[0].YValueMembers = wax;chart2.Series[1].YValueMembers = s;

两组数（wax，s）都需要根据下拉框的值来选择列，启动时显示ambiguous column name: CHR111009（comboBox1.Text=CHR1，comboBox2.Text=1，c
omboBox3.Text=1009）

也试过

SQLiteDataAdapter mAdapter = new SQLiteDataAdapter("select " + wax + ",para from 电缆参数 union select " + s + ",para from 电缆参数1 ", m);

显示 union前后所取得列数应一样
也试过

string dbPath = @"D:\历年高考分数.db";
            string sq = @"Data Source=" + dbPath;
            m = new SQLiteConnection(sq);
            m.Open();
            SQLiteDataAdapter mAdapter = new SQLiteDataAdapter("select " + wax + ",para from 电缆参数", m);
            SQLiteDataAdapter mAdapter1 = new SQLiteDataAdapter("select " + s + " from 电缆参数1", m);
            DataSet ds = new DataSet();
            DataSet ds1 = new DataSet();
            mAdapter.Fill(ds);
            mAdapter1.Fill(ds1);
            DataTable dt = ds.Tables[0];
            DataTable dt1 = ds1.Tables[0];
            //设置图表的数据源
            chart2.DataSource = dt;
            //chart2.DataSource = dt1+dt;
            chart2.DataSource = dt1;

启动时会显示找不到名为“para”的列。但表中有“para”列，可能 chart2.DataSource以最后出现的dt1为准。可不可以让wax，s分别是同一列的前20个数，后20个数 如果不行，应该怎么改

我咋感觉你刚开始是select要查询的东西要加上表名的原因

先在可执行窗口中写好查询语句再到代码中拼接