AUTOTRACE table joining : autotrace « SQL PLUS Session Environment « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
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Oracle PL/SQL Tutorial » SQL PLUS Session Environment » autotrace 
29. 36. 11. AUTOTRACE table joining
SQL>
SQL>CREATE TABLE project (
  2    pro_id              NUMBER(4),
  3    pro_name            VARCHAR2(40),
  4    budget          NUMBER(9,2),
  5    CONSTRAINT project_pk   PRIMARY KEY (pro_id)
  6  );

Table created.

SQL>
SQL>
SQL>INSERT INTO project(pro_id, pro_name, budget)VALUES (1001'A',12345);

row created.

SQL>INSERT INTO project(pro_id, pro_name, budget)VALUES (1002'ERP',23456);

row created.

SQL>INSERT INTO project(pro_id, pro_name, budget)VALUES (1003'SQL',34567);

row created.

SQL>INSERT INTO project(pro_id, pro_name, budget)VALUES (1004'CRM',45678);

row created.

SQL>INSERT INTO project(pro_id, pro_name, budget)VALUES (1005'VPN',56789);

row created.

SQL>
SQL>
SQL>CREATE TABLE server_usage (
  2    pro_id                   NUMBER(4),
  3    emp_id                  NUMBER,
  4    time_log_date                DATE,
  5    hours_logged                 NUMBER(8,2),
  6    dollars_charged              NUMBER(8,2),
  7    CONSTRAINT server_usage_pk  PRIMARY KEY (pro_id, emp_id, time_log_date)
  8  );

Table created.

SQL>INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
  2                    VALUES (1001,101,to_date('4-Apr-2004','dd-mon-yyyy'),1123,222);

row created.

SQL>INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
  2                    VALUES (1002,102,to_date('4-Apr-2005','dd-mon-yyyy'),1124,223);

row created.

SQL>INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
  2                    VALUES (1003,103,to_date('4-Apr-2006','dd-mon-yyyy'),1125,224);

row created.

SQL>INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
  2                    VALUES (1004,104,to_date('4-Apr-2007','dd-mon-yyyy'),1126,225);

row created.

SQL>INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
  2                    VALUES (1005,105,to_date('4-Apr-2008','dd-mon-yyyy'),1127,226);

row created.

SQL>INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
  2                    VALUES (1001,106,to_date('4-Apr-2009','dd-mon-yyyy'),1128,227);

row created.

SQL>INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
  2                    VALUES (1002,107,to_date('4-Apr-2010','dd-mon-yyyy'),1129,228);

row created.

SQL>
SQL>CREATE TABLE emp (
  2    emp_id               NUMBER,
  3    ename             VARCHAR2(40),
  4    hire_date        DATE DEFAULT sysdate,
  5    end_date DATE,
  6    rate     NUMBER(5,2),
  7    CONSTRAINT emp_pk    PRIMARY KEY (emp_id)
  8  );

Table created.

SQL>INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (101'Mary', to_date('15-Nov-1961','dd-mon-yyyy'),null,169);

row created.

SQL>INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (102'Tom', to_date('16-Sep-1964','dd-mon-yyyy'),to_date('5-May-2004','dd-mon-yyyy'),135);

row created.

SQL>INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (104'Peter', to_date('29-Dec-1987','dd-mon-yyyy'),to_date('1-Apr-2004','dd-mon-yyyy'),99);

row created.

SQL>INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (105'Mike', to_date('15-Jun-2004','dd-mon-yyyy'),null,121);

row created.

SQL>INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (107'Less', to_date('2-Jan-2004','dd-mon-yyyy'),null,45);

row created.

SQL>INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (108'Park', to_date('1-Mar-1994','dd-mon-yyyy'),to_date('15-Nov-2004','dd-mon-yyyy'),220);

row created.

SQL>INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (110'Ink', to_date('4-Apr-2004','dd-mon-yyyy'),to_date('30-Sep-2004','dd-mon-yyyy'),84);

row created.

SQL>INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (111'Tike', to_date('23-Aug-1976','dd-mon-yyyy'),null,100);

row created.

SQL>INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (112'Inn', to_date('15-Nov-1961','dd-mon-yyyy'),to_date('4-Apr-2004','dd-mon-yyyy'),70);

row created.

SQL>INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (113'Kate', to_date('3-Mar-2004','dd-mon-yyyy'),to_date('31-Oct-2004','dd-mon-yyyy'),300);

row created.

SQL>
SQL>
SQL>SET ECHO ON
SQL>SET AUTOTRACE TRACEONLY EXPLAIN
SQL>
SQL>SELECT ename, SUM(hours_logged)
  2  FROM emp, server_usage
  3  WHERE emp.emp_id = server_usage.emp_id
  4  GROUP BY ename;

Execution Plan
----------------------------------------------------------
Plan hash value: 2561811960

------------------------------------------------------
| Id  | Operation                     | Name         |
------------------------------------------------------
|   SELECT STATEMENT              |              |
|   |  SORT GROUP BY                |              |
|   |   NESTED LOOPS                |              |
|   |    TABLE ACCESS FULL          | SERVER_USAGE |
|   |    TABLE ACCESS BY INDEX ROWID| EMP          |
|*  |     INDEX UNIQUE SCAN         | EMP_PK       |
------------------------------------------------------

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

   - access("EMP"."EMP_ID"="SERVER_USAGE"."EMP_ID")

Note
-----
   - rule based optimizer used (consider using cbo)

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

Table dropped.

SQL>drop table project;

Table dropped.

SQL>drop table server_usage;

Table dropped.
29. 36. autotrace
29. 36. 1. Autotrace explain a select statement
29. 36. 2. autotrace traceonly statistics
29. 36. 3. set autotrace traceonly statistics to trace a function
29. 36. 4. set arraysize 5
29. 36. 5. Introduction to SQL Tuning - Workshop
29. 36. 6. set autotrace traceonly explain for bitmap index
29. 36. 7. set autotrace traceonly explain, and condition
29. 36. 8. set autotrace traceonly statistics
29. 36. 9. set autotrace traceonly statistics for 'select * from tableName'
29. 36. 10. AUTOTRACE exists (subquery)
29. 36. 11. AUTOTRACE table joining
29. 36. 12. AUTOTRACE table joining and aggregate function
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