Oracle execute immediate

The EXECUTE IMMEDIATE statement executes a dynamic SQL statement or anonymous PL/SQL block. You can use it to issue SQL statements that cannot be represented directly in PL/SQL, or to build up statements where you do not know all the table names, WHERE clauses, and so on in advance. For more information

Examples
The following PL/SQL block contains several examples of dynamic SQL:

DECLARE
   sql_stmt    VARCHAR2(200);
   plsql_block VARCHAR2(500);
   emp_id      NUMBER(4) := 7566;
   salary      NUMBER(7,2);
   dept_id     NUMBER(2) := 50;
   dept_name   VARCHAR2(14) := 'PERSONNEL';
   location    VARCHAR2(13) := 'DALLAS';
   emp_rec     emp%ROWTYPE;
BEGIN
   EXECUTE IMMEDIATE 'CREATE TABLE bonus (id NUMBER, amt NUMBER)';
   sql_stmt := 'INSERT INTO dept VALUES (:1, :2, :3)';
   EXECUTE IMMEDIATE sql_stmt USING dept_id, dept_name, location;
   sql_stmt := 'SELECT * FROM emp WHERE empno = :id';
   EXECUTE IMMEDIATE sql_stmt INTO emp_rec USING emp_id;
   plsql_block := 'BEGIN emp_pkg.raise_salary(:id, :amt); END;';
   EXECUTE IMMEDIATE plsql_block USING 7788, 500;
   sql_stmt := 'UPDATE emp SET sal = 2000 WHERE empno = :1
      RETURNING sal INTO :2';
   EXECUTE IMMEDIATE sql_stmt USING emp_id RETURNING INTO salary;
   EXECUTE IMMEDIATE 'DELETE FROM dept WHERE deptno = :num'
      USING dept_id;
   EXECUTE IMMEDIATE 'ALTER SESSION SET SQL_TRACE TRUE';
END;

CREATE OR REPLACE PROCEDURE wysw_hier() AS

BEGIN

execute IMMEDIATE 'CREATE OR REPLACE VIEW dane AS
     SELECT sid, snazw
     FROM SPOLKA
     UNION ALL
     SELECT kid, knazw
     FROM KOMORKA
     UNION ALL
     SELECT pid, pnazw
     FROM PRACOWNIK';
END;