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SQL查询中"<"附近的语法不正确

       String start_cd;
       String end_cd;
       int time_start_int;
       int time_end_int;
        opencon();

        SqlCommand res = new SqlCommand("SELECT ID,Available,Type," + start_cd + "," + 
            end_cd + " FROM " + going + 
           " WHERE " + start_cd + "!=0 or " + end_cd + "!=0 and " + 
           time_start_int + " <= " + start_cd + " <= " + time_end_int + "", con);
        SqlDataAdapter sda_res = new SqlDataAdapter(res);
        DataTable dt_res = new DataTable();
        sda_res.Fill(dt_res);

        listBox1.DataSource=dt_res;
        listBox1.DisplayMember="ID";

        listBox2.DataSource = dt_res;
        listBox2.DisplayMember = start_cd;
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我想获取sql表 …

c# sql sql-server conditional-statements

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