Bind Variable in SELECT statement and get the value in PL/SQL block

Question

Hi All,
I would like  pass bind variable in SELECT statement and get the value of the column in Dynamic SQL
Please seee below
I want to get the below value
Expected result:
select  distinct empno ,pr.dept   from emp pr, dept ps where   ps.dept like '%IT'  and pr.empno =100
100, HR
select  distinct ename ,pr.dept   from emp pr, dept ps where   ps.dept like '%IT'  and pr.empno =100
TEST, HR
select  distinct loc ,pr.dept   from emp pr, dept ps where   ps.dept like '%IT'  and pr.empno =100
NYC, HR
Using the below block I am getting column names only not the value of the column. I need to pass that value(TEST,NYC..) into l_col_val variable
Please suggest
----- TABLE LIST
CREATE TABLE EMP(
EMPNO NUMBER,
ENAME VARCHAR2(255),
DEPT VARCHAR2(255),
LOC    VARCHAR2(255)
INSERT INTO EMP (EMPNO,ENAME,DEPT,LOC) VALUES (100,'TEST','HR','NYC');
INSERT INTO EMP (EMPNO,ENAME,DEPT,LOC) VALUES (200,'TEST1','IT','NYC');
INSERT INTO EMP (EMPNO,ENAME,DEPT,LOC) VALUES (300,'TEST2','MR','NYC');
INSERT INTO EMP (EMPNO,ENAME,DEPT,LOC) VALUES (400,'TEST3','HR','DTR');
INSERT INTO EMP (EMPNO,ENAME,DEPT,LOC) VALUES (500,'TEST4','HR','DAL');
INSERT INTO EMP (EMPNO,ENAME,DEPT,LOC) VALUES (600,'TEST5','IT','ATL');
INSERT INTO EMP (EMPNO,ENAME,DEPT,LOC) VALUES (700,'TEST6','IT','BOS');
INSERT INTO EMP (EMPNO,ENAME,DEPT,LOC) VALUES (800,'TEST7','HR','NYC');
COMMIT;
CREATE TABLE COLUMNAMES(
COLUMNAME VARCHAR2(255)
INSERT INTO COLUMNAMES(COLUMNAME) VALUES ('EMPNO');
INSERT INTO COLUMNAMES(COLUMNAME) VALUES ('ENAME');
INSERT INTO COLUMNAMES(COLUMNAME) VALUES ('DEPT');
INSERT INTO COLUMNAMES(COLUMNAME) VALUES ('LOC');
COMMIT;
CREATE TABLE DEPT(
DEPT VARCHAR2(255),
DNAME VARCHAR2(255)
INSERT INTO DEPT(DEPT,DNAME) VALUES ('IT','INFORMATION TECH');
INSERT INTO DEPT(DEPT,DNAME) VALUES ('HR','HUMAN RESOURCE');
INSERT INTO DEPT(DEPT,DNAME) VALUES ('MR','MARKETING');
INSERT INTO DEPT(DEPT,DNAME) VALUES ('IT','INFORMATION TECH');
COMMIT;
PL/SQL BLOCK
DECLARE
  TYPE EMPCurTyp  IS REF CURSOR;
  v_EMP_cursor    EMPCurTyp;
  l_col_val           EMP.ENAME%type;
  l_ENAME_val       EMP.ENAME%type;
l_col_ddl varchar2(4000);
l_col_name varchar2(60);
l_tab_name varchar2(60);
l_empno number ;
b_l_col_name VARCHAR2(255);
b_l_empno NUMBER;
begin
for rec00 in (
select EMPNO aa from  EMP
loop
l_empno := rec00.aa;
for rec in (select COLUMNAME as column_name  from  columnames
loop
l_col_name := rec.column_name;
begin
  l_col_val :=null;
   l_col_ddl := 'select  distinct :b_l_col_name ,pr.dept ' ||'  from emp pr, dept ps where   ps.dept like ''%IT'' '||' and pr.empno =:b_l_empno';
   dbms_output.put_line('DDL ...'||l_col_ddl);
   OPEN v_EMP_cursor FOR l_col_ddl USING l_col_name, l_empno;
LOOP
    l_col_val :=null;
    FETCH v_EMP_cursor INTO l_col_val,l_ename_val;
    EXIT WHEN v_EMP_cursor%NOTFOUND;
      dbms_output.put_line('l_col_name='||l_col_name ||'  empno ='||l_empno);
   END LOOP;
CLOSE v_EMP_cursor;
END;
END LOOP;
END LOOP;
END;

Answer 1

user1758353 wrote:
Thanks Billy, Would you be able to suggest any other faster method to load the data into table. Thanks,
As Mark responded - it all depends on the actual data to load, structure and source/origin. On my busiest database, I am loading on average 30,000 rows every second from data in external files.
However, the data structures are just that - structured. Logical.
Having a data structure with 100's of fields (columns in a SQL table), raise all kinds of questions about how sane that structure is, and what impact it will have on a physical data model implementation.
There is a gross misunderstanding by many when it comes to performance and scalability. The prime factor that determines performance is not how well you code, what tools/language you use, the h/w your c ode runs on, or anything like that. The prime factor that determines perform is the design of the data model - as it determines the complexity/ease to use the data model, and the amount of I/O (the slowest of all db operations) needed to effectively use the data model.