Oracle PL/SQL/Index/Create Index — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
Admin (обсуждение | вклад) м (1 версия) |
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Текущая версия на 10:02, 26 мая 2010
Содержание
- 1 Create a fully indexed table named myCode
- 2 Create an index, and add primary key to use that index
- 3 Create an index reverse
- 4 Created an index based on the uppercase evaluation of the employe"s first name field
- 5 Create index along with the column definition
- 6 Create index for combined columns
- 7 Create index for upper case last name
- 8 Create index on cluster
- 9 Create index with tablespace
- 10 Create Non-Unique index
- 11 Create two indexes for one single table
- 12 CREATE UNIQUE INDEX
- 13 Create unique index and check it in user_ind_columns and user_cons_columns
- 14 create unique index with case ... when statement
- 15 Demonstrate a bitmap join index.
- 16 Function-based Indexes
- 17 indextype is ctxsys.context
- 18 simple index organized table
- 19 To create an index on the LastName column of the Employee table
Create a fully indexed table named myCode
SQL>
SQL> create table myCode(
2 codeValue VARCHAR2(1) primary key,
3 Description VARCHAR2(25)
4 );
Table created.
SQL>
SQL> create index i1 on myCode (codeValue, Description);
Index created.
SQL>
SQL>
SQL> drop index i1;
Index dropped.
SQL>
SQL> drop table myCode;
Table dropped.
Create an index, and add primary key to use that index
SQL>
SQL>
SQL> create table inventory(
2 partno number(4),
3 partdesc varchar2(35),
4 price number(8,2),
5 warehouse varchar2(15));
Table created.
SQL>
SQL> Create index invent_part_loc_idx
2 On inventory (partno, warehouse)
3 Pctfree 10;
Index created.
SQL>
SQL> Alter table inventory add (
2 Constraint invent_partno_pk primary key (partno)
3 Using index invent_part_loc_idx);
Table altered.
SQL>
SQL> drop table inventory;
Table dropped.
SQL>
Create an index reverse
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> create index emp_empno_pk
2 on emp(empno) reverse;
Index created.
SQL>
SQL> drop table emp;
Table dropped.
SQL>
Created an index based on the uppercase evaluation of the employe"s first name field
SQL> -- create demo table
SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL,
3 First_Name VARCHAR2(10 BYTE),
4 Last_Name VARCHAR2(10 BYTE),
5 Start_Date DATE,
6 End_Date DATE,
7 Salary Number(8,2),
8 City VARCHAR2(10 BYTE),
9 Description VARCHAR2(15 BYTE)
10 )
11 /
Table created.
SQL>
SQL> -- prepare data
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ("01","Jason", "Martin", to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto", "Programmer")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("02","Alison", "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("03","James", "Smith", to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("04","Celia", "Rice", to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("05","Robert", "Black", to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("06","Linda", "Green", to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York", "Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("07","David", "Larry", to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York", "Manager")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("08","James", "Cat", to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
3 /
1 row created.
SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
2 /
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer
02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester
03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester
04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager
05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester
06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester
07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager
08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester
8 rows selected.
SQL>
SQL>
SQL> -- Created an index based on the uppercase evaluation of the employe"s first name field.
SQL>
SQL> CREATE INDEX employee_idx
2 ON employee (UPPER(first_name));
Index created.
SQL>
SQL> drop index employee_idx;
Index dropped.
SQL>
SQL> -- clean the table
SQL> drop table Employee
2 /
Table dropped.
SQL>
Create index along with the column definition
SQL>
SQL>
SQL> CREATE TABLE emp2
2 (emp_id NUMBER PRIMARY KEY
3 USING INDEX
4 (CREATE INDEX pk_idx ON emp2(emp_id) TABLESPACE users)
5 ,lastname VARCHAR2(20) CONSTRAINT lastname_create_nn NOT NULL
6 ,firstname VARCHAR2(15) CONSTRAINT firstname_create_nn NOT NULL
7 ,phone VARCHAR2(12)
8 ,company_name VARCHAR2(50)
9 ,CONSTRAINT unique_emp_phone UNIQUE (phone)
10 USING INDEX
11 (CREATE INDEX phone_idx ON emp2 (phone) TABLESPACE users)
12 );
Table created.
SQL>
SQL>
SQL> drop table emp2;
Table dropped.
Create index for combined columns
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> create index fullname on emp(lastname, firstname);
Index created.
SQL>
SQL>
SQL> drop table emp;
Table dropped.
SQL>
SQL>
Create index for upper case last name
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> create index upper_emp_idx on emp upper(lastname);
Index created.
SQL>
SQL>
SQL> drop table emp;
Table dropped.
Create index on cluster
SQL> create cluster user_objects_cluster_btree
2 ( username varchar2(30) )
3 size 1024
4 /
Cluster created.
SQL>
SQL> create index user_objects_idx
2 on cluster user_objects_cluster_btree
3 /
Index created.
SQL>
SQL> drop cluster user_objects_cluster_btree;
Cluster dropped.
SQL>
Create index with tablespace
SQL> create table emp (
2 EmpNo NUMBER(10) primary key,
3 Name VARCHAR2(40),
4 DeptNo NUMBER(2),
5 Salary NUMBER(7,2),
6 Birth_Date DATE,
7 Soc_Sec_Num VARCHAR2(9),
8 State_Code CHAR(2)
9 );
SQL>
SQL> create index CITY_ST_ZIP_NDX
2 on emp(EmpNo, DeptNo, Soc_Sec_Num)
3 tablespace INDEXES;
SQL>
SQL> drop table emp
2
Create Non-Unique index
SQL>
SQL>
SQL> CREATE TABLE myTable (
2 myTableID INT PRIMARY KEY NOT NULL,
3 Name VARCHAR(50),
4 PhoneNo VARCHAR(15) DEFAULT "Unknown Phone");
Table created.
SQL>
SQL>
SQL> CREATE INDEX NameIndex ON myTable (Name);
Index created.
SQL>
Create two indexes for one single table
create table indextest as
select * from dba_objects where owner in ("OUTLN","PUBLIC","SCOTT","SYS","SYSTEM");
create index indxtest_objname_idx on indextest (object_name) pctfree 10;
create index indxtest_objname_fidx on indextest(upper(object_name));
select object_name,owner from indextest
where upper(object_name) ="DBA_INDEXES";
select upper(object_name) from indextest;
alter table indextest modify object_name NOT NULL;
select upper(object_name) from indextest;
drop table indextest;
CREATE UNIQUE INDEX
SQL>
SQL> CREATE TABLE myTable (
2 myTableID INT PRIMARY KEY NOT NULL,
3 Name VARCHAR(50),
4 PhoneNo VARCHAR(15) DEFAULT "Unknown Phone");
Table created.
SQL>
SQL> CREATE UNIQUE INDEX NameIndex ON myTable (Name);
Index created.
SQL>
SQL> drop table myTable;
Table dropped.
Create unique index and check it in user_ind_columns and user_cons_columns
SQL>
SQL> set echo off
SQL> create table emp(
2 emp_id integer primary key
3 ,lastname varchar2(20) constraint lastname_create_nn not null
4 ,firstname varchar2(15) constraint firstname_create_nn 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> create unique index pk_idx on emp (emp_id);
SQL>
SQL> select index_name, table_name, column_name from user_ind_columns where table_name = "EMP";
SQL>
SQL> select constraint_name, table_name, column_name from user_cons_columns where table_name = "EMP";
SQL>
SQL>
SQL> drop table emp cascade constraints;
Table dropped.
SQL>
create unique index with case ... when statement
SQL> create table registrations
2 ( attendee NUMBER(4)
3 , course VARCHAR2(6)
4 , begindate DATE
5 , evaluation NUMBER(1)
6 , constraint R_PK primary key(attendee,course,begindate)
7 ) ;
Table created.
SQL>
SQL> insert into registrations values (8,"JAV",date "2009-12-13",5 );
1 row created.
SQL> insert into registrations values (9,"JAV",date "2009-12-13",4 );
1 row created.
SQL> insert into registrations values (4,"JAV",date "2000-02-01",3 );
1 row created.
SQL> insert into registrations values (8,"JAV",date "2000-02-01",4 );
1 row created.
SQL> insert into registrations values (6,"JAV",date "2000-02-01",5 );
1 row created.
SQL> insert into registrations values (12,"XML",date "2000-02-03",4 );
1 row created.
SQL> insert into registrations values (2,"XML",date "2000-02-03",5 );
1 row created.
SQL> insert into registrations values (4,"PLS",date "2000-09-11",NULL);
1 row created.
SQL> insert into registrations values (2,"PLS",date "2000-09-11",NULL);
1 row created.
SQL> insert into registrations values (11,"PLS",date "2000-09-11",NULL);
1 row created.
SQL>
SQL> create unique index oau_reg on registrations
2 ( case course when "OAU" then attendee else null end
3 , case course when "OAU" then course else null end );
Index created.
SQL>
SQL> insert into registrations values (12,"OAU",sysdate,null);
1 row created.
SQL>
SQL> drop index oau_reg;
Index dropped.
SQL> drop table registrations;
Table dropped.
Demonstrate a bitmap join index.
SQL>
SQL>
SQL> CREATE TABLE EMP(
2 EMPNO NUMBER(4) NOT NULL,
3 ENAME VARCHAR2(10),
4 JOB VARCHAR2(9),
5 MGR NUMBER(4),
6 startDate DATE,
7 SAL NUMBER(7, 2),
8 COMM NUMBER(7, 2),
9 DEPTNO NUMBER(2)
10 );
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, "E", "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(
2 DEPTNO NUMBER(2),
3 DNAME VARCHAR2(14),
4 LOC VARCHAR2(13)
5 );
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> select count(*) from emp, dept where emp.deptno = dept.deptno and dept.dname = "SALES";
COUNT(*)
----------
6
1 row selected.
Execution Plan
----------------------------------------------------------
Plan hash value: 2157540364
-------------------------------------
| Id | Operation | Name |
-------------------------------------
| 0 | SELECT STATEMENT | |
| 1 | SORT AGGREGATE | |
| 2 | MERGE JOIN | |
| 3 | SORT JOIN | |
|* 4 | TABLE ACCESS FULL| DEPT |
|* 5 | SORT JOIN | |
| 6 | TABLE ACCESS FULL| EMP |
-------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - filter("DEPT"."DNAME"="SALES")
5 - access("EMP"."DEPTNO"="DEPT"."DEPTNO")
filter("EMP"."DEPTNO"="DEPT"."DEPTNO")
Note
-----
- rule based optimizer used (consider using cbo)
Statistics
----------------------------------------------------------
1 recursive calls
0 db block gets
6 consistent gets
0 physical reads
0 redo size
411 bytes sent via SQL*Net to client
380 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
1 rows processed
SQL>
SQL> set autotrace off;
SQL>
SQL> drop table emp;
Table dropped.
SQL> drop table dept;
Table dropped.
SQL>
SQL>
Function-based Indexes
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> create index upper_name_idx on emp(upper(ename));
Index created.
SQL>
SQL>
SQL> drop table EMP;
Table dropped.
SQL>
SQL>
indextype is ctxsys.context
SQL>
SQL>
SQL> create table t ( x clob );
Table created.
SQL>
SQL> set autotrace traceonly explain
SQL> select * from t;
Execution Plan
----------------------------------------------------------
Plan hash value: 1601196873
----------------------------------
| Id | Operation | Name |
----------------------------------
| 0 | SELECT STATEMENT | |
| 1 | TABLE ACCESS FULL| T |
----------------------------------
Note
-----
- rule based optimizer used (consider using cbo)
SQL>
SQL> create index t_idx on t(x) indextype is ctxsys.context;
Index created.
SQL> select * from t;
Execution Plan
----------------------------------------------------------
Plan hash value: 1601196873
----------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost |
----------------------------------------------------------
| 0 | SELECT STATEMENT | | 82 | 8200 | 1 |
| 1 | TABLE ACCESS FULL| T | 82 | 8200 | 1 |
----------------------------------------------------------
Note
-----
- cpu costing is off (consider enabling it)
SQL>
SQL> set autotrace off
SQL>
SQL> drop table t;
Table dropped.
simple index organized table
SQL>
SQL> create table states (
2 state_id varchar2(2),
3 state_name varchar2(20),
4 constraint states_pk
5 primary key (state_id)
6 )
7 organization index
8 /
Table created.
SQL>
SQL> drop table states;
Table dropped.
SQL>
To create an index on the LastName column of the Employee table
SQL> -- create demo table
SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL,
3 First_Name VARCHAR2(10 BYTE),
4 Last_Name VARCHAR2(10 BYTE),
5 Start_Date DATE,
6 End_Date DATE,
7 Salary Number(8,2),
8 City VARCHAR2(10 BYTE),
9 Description VARCHAR2(15 BYTE)
10 )
11 /
Table created.
SQL>
SQL> -- prepare data
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ("01","Jason", "Martin", to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto", "Programmer")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("02","Alison", "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("03","James", "Smith", to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("04","Celia", "Rice", to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("05","Robert", "Black", to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("06","Linda", "Green", to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York", "Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("07","David", "Larry", to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York", "Manager")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("08","James", "Cat", to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
3 /
1 row created.
SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
2 /
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer
02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester
03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester
04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager
05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester
06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester
07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager
08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester
8 rows selected.
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> --To create an index on the LastName column of the Employee table
SQL>
SQL> CREATE INDEX LastNameIndex
2 ON Employee (Last_Name);
Index created.
SQL>
SQL>
SQL> drop index LastNameIndex;
Index dropped.
SQL>
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
2 /
Table dropped.
SQL>
SQL>
SQL>