sql语句中多表查询问题

Question

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，comboBox3.Text=1009） 这要如何处理啊

若数据的套句都是用两遍

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

Answer 1

找不到列是真的找不到列，要不就是你查错数据库了，要不就是你查错了表，还有可能是你查询字段和表字段不一样,舍此之外没有其他原因了，仔细检查吧