Mega Code Archive
Explain plan for query
<![CDATA[
SQL>
SQL> create table emp(
2 emp_id integer primary key
3 ,lastname varchar2(20) not null
4 ,firstname varchar2(15) not null
5 ,midinit varchar2(1)
6 ,street varchar2(30)
7 ,city varchar2(20)
8 ,state varchar2(2)
9 ,zip varchar2(5)
10 ,shortZipCode varchar2(4)
11 ,area_code varchar2(3)
12 ,phone varchar2(8)
13 ,company_name varchar2(50));
Table created.
SQL>
SQL>
SQL> insert into emp(emp_id,lastname,firstname,midinit,street,city,state,zip,shortZipCode,area_code,phone,company_name)values
2 (1,'Jones','Joe','J','1 Ave','New York','NY','11202','1111','212', '221-4333','Big Company');
1 row created.
SQL> insert into emp(emp_id,lastname,firstname,midinit,street,city,state,zip,shortZipCode,area_code,phone,company_name)values
2 (2,'Smith','Sue','J','1 Street','New York','NY','11444','1111','212', '436-6773','Little Company');
1 row created.
SQL> insert into emp(emp_id,lastname,firstname,midinit,street,city,state,zip,shortZipCode,area_code,phone,company_name)values
2 (3,'X','Peggy','J','1 Drive','New York','NY','45502','2222','212', '234-4444','Medium Company');
1 row created.
SQL> explain plan for
2 select *
3 from emp
4 where lastname = 'Young';
Explained.
SQL> select operation
2 from plan_table;
SELECT STATEMENT
TABLE ACCESS
SELECT STATEMENT
TABLE ACCESS
SELECT STATEMENT
TABLE ACCESS
6 rows selected.
SQL> explain plan for
2 select *
3 from emp
4 where firstname='Joe';
Explained.
SQL> select operation
2 from plan_table;
SELECT STATEMENT
TABLE ACCESS
SELECT STATEMENT
TABLE ACCESS
SELECT STATEMENT
TABLE ACCESS
SELECT STATEMENT
TABLE ACCESS
8 rows selected.
SQL>
SQL>
SQL> set autotrace off
SQL>
SQL> drop table emp;
Table dropped.
SQL>
SQL>
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