如何在 pl SQL 中将列值设置为列名，但我不知道列值是什么？

Question

I want to populate few aa.one, aa.two, aa.three columns from aa table and when I put aa.one = 'abc' in where condition I want to rename these column names as column values will populate. But one thing I don't know what value will populate through out the table

Answer 1

The only way out is dynamic SQL as you have to compose the whole statement dynamically and run it using execute immediate .

Note that it is difficult to maintain; might be OK for very simple cases, but for complex queries ... I'd think twice before actually doing something about it.

Something like this:

declare
  l_str varchar2(200);
begin
  l_str := 'update '    || par_table_name     || ' set ' ||
           par_column_1 || ' = ' || par_value_1          ||
           ' where '    || par_column_where_1 || ' = '   || par_column_where_value_1;

  execute immediate l_str;
end;