find column names and table names referenced in SQL

Question

How to find all the tables and column names used in a SQL? It is on ORACLE database. Below is an SQL example.

SELECT 
   A.ENAME,
   A.AGE as EMP_AGE,
   B         


        

Answer 1

I have a great solution for you, but there are two things you will need to do:

1. Place the SQL inside a PL/SQL program unit. So, yes, to the stored procedure you mentioned.

2. Compile that program unit and all dependent tables (that is, install your application code) on a 12.2 instance (you can download 12.2 at http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html or you can purchase an Exadata Express CLoud Service at cloud.oracle.com or get a $300 credit to use one at no cost for a month at cloud.oracle.com/tryit).

12.2 is key because the feature you REALLY want to use is called PL/Scope and it is a compiler tool that collections information about PL/SQL identifiers (as of 11.1) and SQL usage inside PL/'SQL (as of 12.2).

CREATE TABLE my_data (n NUMBER)
/

ALTER SESSION SET plscope_settings='identifiers:all, statements:all'
/

CREATE OR REPLACE PROCEDURE my_procedure (n_in IN NUMBER)
   AUTHID DEFINER
IS
   l_n           my_data.n%TYPE;

   CURSOR all_data_cur
   IS
          SELECT *
            FROM my_data
      FOR UPDATE OF n;
BEGIN
   INSERT INTO my_data (n)
        VALUES (n_in);

END;
/

  SELECT idt.line,
         idt.owner || '.' || idt.object_name code_unit, 
         idt.name column_name,
         RTRIM (src.text, CHR (10)) text
    FROM all_identifiers idt, all_source src
   WHERE     idt.usage = 'REFERENCE'
         AND idt.TYPE = 'COLUMN'
         AND idt.line = src.line
         AND idt.object_name = src.name
         AND idt.owner = src.owner
         AND idt.object_name = 'MY_PROCEDURE'
ORDER BY code_unit, line
/

LINE CODE_UNIT          COLUMN_NAME TEXT  
4   STEVEN.MY_PROCEDURE N           l_n           my_data.n%TYPE;
10  STEVEN.MY_PROCEDURE N           FOR UPDATE OF n;
12  STEVEN.MY_PROCEDURE N           INSERT INTO my_data (n)

Hope that helps!

Lots more examples of PL/Scope at livesql.oracle.com. Just search for "pl/scope" (duh).