Analyze table with primary key and foreign key : Analyze « SQL Plus « Oracle PL / SQL

1. Oracle PL / SQL
2. SQL Plus
3. Analyze

Analyze table with primary key and foreign key

  
SQL>
SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
  2                    ENAME VARCHAR2(10),
  3                    JOB VARCHAR2(9),
  4                    MGR NUMBER(4),
  5                    HIREDATE DATE,
  6                    SAL NUMBER(7, 2),
  7                    COMM NUMBER(7, 2),
  8                    DEPTNO NUMBER(2));

Table created.

SQL>
SQL> INSERT INTO EMP VALUES (7369, 'SMITH', 'CLERK',    7902, TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES (7499, 'ALLEN', 'SALESMAN', 7698, TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30);

1 row created.

SQL> INSERT INTO EMP VALUES (7521, 'WARD',  'SALESMAN', 7698, TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30);

1 row created.

SQL> INSERT INTO EMP VALUES (7566, 'JONES', 'MANAGER',  7839, TO_DATE('2-APR-1981',  'DD-MON-YYYY'), 2975, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES (7654, 'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30);

1 row created.

SQL> INSERT INTO EMP VALUES (7698, 'BLAKE', 'MANAGER', 7839,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);

1 row created.

SQL> INSERT INTO EMP VALUES (7782, 'CLARK', 'MANAGER', 7839,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);

1 row created.

SQL> INSERT INTO EMP VALUES (7788, 'SCOTT', 'ANALYST', 7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES (7839, 'KING', 'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);

1 row created.

SQL> INSERT INTO EMP VALUES (7844, 'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500, 0, 30);

1 row created.

SQL> INSERT INTO EMP VALUES (7876, 'ADAMS', 'CLERK', 7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES (7900, 'JAMES', 'CLERK', 7698,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);

1 row created.

SQL> INSERT INTO EMP VALUES (7902, 'FORD', 'ANALYST', 7566,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES (7934, 'MILLER', 'CLERK', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);

1 row created.

SQL>
SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) );

Table created.

SQL>
SQL> INSERT INTO DEPT VALUES (10, 'ACCOUNTING', 'NEW YORK');

1 row created.

SQL> INSERT INTO DEPT VALUES (20, 'RESEARCH', 'DALLAS');

1 row created.

SQL> INSERT INTO DEPT VALUES (30, 'SALES', 'CHICAGO');

1 row created.

SQL> INSERT INTO DEPT VALUES (40, 'OPERATIONS', 'BOSTON');

1 row created.

SQL>
SQL> analyze table emp compute statistics;

Table analyzed.

SQL> analyze table dept compute statistics;

Table analyzed.

SQL>
SQL> alter table emp  add constraint emp_pk      primary key(empno);

Table altered.

SQL> alter table dept add constraint dept_pk     primary key(deptno);

Table altered.

SQL> alter table emp  add constraint emp_fk_dept foreign key (deptno) references dept;

Table altered.

SQL>
SQL> set autotrace traceonly explain
SQL>
SQL> select * from emp, dept where emp.deptno = dept.deptno;

Execution Plan
----------------------------------------------------------
Plan hash value: 3487251775

----------------------------------------------------------------------------------------
| Id  | Operation                    | Name    | Rows  | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT             |         |    14 |   700 |     3   (0)| 00:00:01 |
|   1 |  NESTED LOOPS                |         |    14 |   700 |     3   (0)| 00:00:01 |
|   2 |   TABLE ACCESS FULL          | EMP     |    14 |   448 |     2   (0)| 00:00:01 |
|   3 |   TABLE ACCESS BY INDEX ROWID| DEPT    |     1 |    18 |     1   (0)| 00:00:01 |
|*  4 |    INDEX UNIQUE SCAN         | DEPT_PK |     1 |       |     0   (0)| 00:00:01 |
----------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   4 - access("EMP"."DEPTNO"="DEPT"."DEPTNO")

SQL>
SQL> analyze table emp compute statistics;

Table analyzed.

SQL> analyze table dept compute statistics;

Table analyzed.

SQL>
SQL> select * from emp, dept where emp.deptno = dept.deptno;

Execution Plan
----------------------------------------------------------
Plan hash value: 3487251775

----------------------------------------------------------------------------------------
| Id  | Operation                    | Name    | Rows  | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT             |         |    14 |   700 |     3   (0)| 00:00:01 |
|   1 |  NESTED LOOPS                |         |    14 |   700 |     3   (0)| 00:00:01 |
|   2 |   TABLE ACCESS FULL          | EMP     |    14 |   448 |     2   (0)| 00:00:01 |
|   3 |   TABLE ACCESS BY INDEX ROWID| DEPT    |     1 |    18 |     1   (0)| 00:00:01 |
|*  4 |    INDEX UNIQUE SCAN         | DEPT_PK |     1 |       |     0   (0)| 00:00:01 |
----------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   4 - access("EMP"."DEPTNO"="DEPT"."DEPTNO")

SQL>
SQL> set autotrace off
SQL>
SQL> drop table emp cascade constraints;

Table dropped.

SQL> drop table dept cascade constraints;

Table dropped.

SQL>

   
  

Related examples in the same category