Thursday, November 29, 2012

DDL to create table scott.emp and DML to load data

Purpose
=======
I often use emp (and dept) table to build test cases, to prove concept and explore new features.
It's not easy to find the original DDL and DML to create the table and load the data.
So I just get it by myself. I think these DDL/DML are useful to you too.

Notes: I hope you don't have tables named "dept" and "emp" in your application schema.

SQL>


drop table dept purge;

CREATE TABLE dept (
 deptno NUMBER(2),
 dname  VARCHAR2(15),
 loc    VARCHAR2(15),
 constraint dept_pk primary key (deptno)
);

INSERT INTO dept VALUES (10, 'ACCOUNTING', 'NEW YORK');
INSERT INTO dept VALUES (20, 'RESEARCH', 'DALLAS');
INSERT INTO dept VALUES (30, 'SALES', 'CHICAGO');
INSERT INTO dept VALUES (40, 'OPERATIONS', 'BOSTON');

COMMIT;

drop table emp purge;

CREATE TABLE EMP
( EMPNO NUMBER(4) NOT NULL,
  ENAME VARCHAR2(10),
  JOB VARCHAR2(9),
  MGR NUMBER(4),
  HIREDATE DATE,
  SAL NUMBER(7, 2),
  COMM NUMBER(7, 2),
  DEPTNO NUMBER(2),
  constraint emp_pk primary key (Empno),
  CONSTRAINT emp_fk1 FOREIGN KEY (deptno) REFERENCES dept
);

INSERT INTO EMP VALUES (7369, 'SMITH', 'CLERK',    7902, TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20);
INSERT INTO EMP VALUES (7499, 'ALLEN', 'SALESMAN', 7698, TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30);
INSERT INTO EMP VALUES (7521, 'WARD',  'SALESMAN', 7698, TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30);
INSERT INTO EMP VALUES (7566, 'JONES', 'MANAGER',  7839, TO_DATE('2-APR-1981',  'DD-MON-YYYY'), 2975, NULL, 20);
INSERT INTO EMP VALUES (7654, 'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30);
INSERT INTO EMP VALUES (7698, 'BLAKE', 'MANAGER', 7839,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);
INSERT INTO EMP VALUES (7782, 'CLARK', 'MANAGER', 7839,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);
INSERT INTO EMP VALUES (7788, 'SCOTT', 'ANALYST', 7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);
INSERT INTO EMP VALUES (7839, 'KING', 'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);
INSERT INTO EMP VALUES (7844, 'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500, 0, 30);
INSERT INTO EMP VALUES (7876, 'ADAMS', 'CLERK', 7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);
INSERT INTO EMP VALUES (7900, 'JAMES', 'CLERK', 7698,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);
INSERT INTO EMP VALUES (7902, 'FORD', 'ANALYST', 7566,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);
INSERT INTO EMP VALUES (7934, 'MILLER', 'CLERK', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);

commit;


Demo de-duplicate on emp.ename
=======

INSERT INTO EMP VALUES (7935, 'MILLER', 'ANALYST', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);
INSERT INTO EMP VALUES (7936, 'MILLER', 'SALESMAN', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);
commit;

A deduplicate will be like this,

DELETE FROM scott.emp
WHERE ROWID IN
 (
  SELECT rid
    FROM (SELECT /*x parallel(a) */
                 ROWID rid, ename,
                 ROW_NUMBER () OVER (PARTITION BY ename ORDER BY empno) rn
            FROM scott.emp a)
  WHERE rn <> 1
);


Gather table statistics 
=======
begin
    dbms_stats.gather_table_stats(
        ownname      => user,
        tabname      =>'EMP',
        estimate_percent => 0.2,
        method_opt   => 'for all columns size 1'
    );
end;
/

- 木匠

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