HPLSQL

Hello dear experts,

          I met a block about the Dynamic SQL in hpl\sql.  It can't use this method to generate the correct string:

          DECLARE cur_col_list CURSOR FOR 
                ' SELECT col_name,col_type FROM ' || v_src_tb || 
                ' WHERE tb_name = ' || '''' || v_tb_name || '''' ;

         the result as below(missed single quotes on both side of sta_wop_md_op_topic_option :    

         but the correct result should be like this:   

         SELECT col_name,col_type
         FROM landing.meta
         WHERE tb_name = 'sta_wop_md_op_topic_option' ;