SQL Join Help

SQL Experts,
I have a query below. Can I improve the SQL joining order in highlighted section - Lines 31 to 40
SNIOTM.SNI_PA_OTM_ARC_DRVR -- around 200K rows
SNIOTM.SNI_PA_ORD_SHP_STATUS -- 8 rows
Edited by: 922411 on May 12, 2013 7:42 PM

922411 wrote:
SQL Experts,
I have a query below. Can I improve the SQL joining order in highlighted section - Lines 31 to 40
SNIOTM.SNI_PA_OTM_ARC_DRVR -- around 200K rows
SNIOTM.SNI_PA_ORD_SHP_STATUS -- 8 rowsYou need not worry about the Joining Order, Oracle CBO is efficient enough to choose the Most Efficient way of joining the tables. However, it will depend on your Oracle Version, which you have not mentioned. If you are 10g or higher then you certainly need not worry.
If you sense a problem in performance of query, then I will suggest you read the linked threads in {message:id=9360003} and post the details as specified.
Only this will help us provide releavant suggestions and avoid guessing games.
PS:- Do not forget to post Oracle Version and the Explain Plan in {noformat}{noformat} tags, exactly as specified.

Similar Messages

SQL Join help for multiple values in single field.

Hello All,
I need a help, I have two tables T1 and T2
Content of T2 will be like
T2. ID | T2.USERNAME
ID1 | John
ID2 | Peter
ID3 | Mark
Content of T1 is like
T1.ID
ID1 ID2 ID3
ID2
ID1 ID3
I need to join these two tables and replace the T1.ID values with T2.USERNAME, for eg. Row one of T1 should be changed as John Peter Mark.
Note: ID1 ID2 ID3 is a single value.
Thanks for your help.
Sathish.

At Volder: I have made a slight enhancement. It's the same thing but the other way around as last week's regular expression thread. Remember the "and then the bird flew away"? ;-)
SQL> create table t1
2 as
3 select 'ID1 ID2 ID3' id from dual union all
4 select 'ID2' from dual union all
5 select 'ID1 ID3' from dual union all
6 select 'ID11 ID2' from dual
7 /
Tabel is aangemaakt.
SQL> create table t2
2 as
3 select 'ID1' id, 'John' username from dual union all
4 select 'ID2', 'Peter' from dual union all
5 select 'ID3', 'Mark' from dual union all
6 select 'ID11', 'Volder' from dual
7 /
Tabel is aangemaakt.
SQL> select * from t1
2   model
3    reference r on (select t2.*, rownum rn from t2)
4     dimension by (rn)
5     measures(id, username)
6    main m
7     dimension by (id)
8     measures(cast(id as varchar(200)) str)
9     rules iterate(100) until (r.id[iteration_number+1] is null)
10      (str[any] = replace(str[CV()], r.id[iteration_number+1],r.username[iteration_number+1]))
11 /
ID          STR
ID1 ID2 ID3 John Peter Mark
ID2         Peter
ID1 ID3     John Mark
ID11 ID2    John1 Peter
4 rijen zijn geselecteerd.
SQL> select id
2       , str
3    from t1
4   model
5         reference r on (select id,username,rownum rn from t2)
6           dimension by (rn)
7           measures (id, username)
8         main m
9           dimension by (id)
10           measures (cast(' ' || id || ' ' as varchar2(200)) str)
11           rules iterate(1000) until (r.id[iteration_number+1] is null)
12           ( str[any] = replace
13             ( str[cv()]
14             , ' ' || r.id[iteration_number+1] || ' '
15             , ' ' || r.username[iteration_number+1] || ' '
16             )
17           )
18 /
ID          STR
ID1 ID2 ID3 John Peter Mark
ID2          Peter
ID1 ID3      John Mark
ID11 ID2     Volder Peter
4 rijen zijn geselecteerd.At Sathish: just look at the queries we have to come up with to do such a simple thing. As said many times before, I would also encourage you to change the design instead of executing the queries presented by Volder and me.
Regards,
Rob.
Message was edited by:
Rob van Wijk
Just noticed I missed a final TRIM function around "str", so please add this.

SQL Join help required!

Hi all
I need help with a join.
If you click the image link below, I need to find a way to join table 1 and table 2 to get table3:
http://img229.imageshack.us/img229/1401/83192078uq8.jpg
Help would be very much appreciated!
Thanks in advance.

with Table1 as(select 1234 as ProjectID,'Smith' as LastName from dual
union select 1234,'Maria' from dual
union select 1234,'Victo' from dual),
Table2 as (select 1234 as ProjectID,200 as Val from dual
union select 1234,300 from dual
union select 1234,400 from dual)
select nvl(a.ProjectID,b.ProjectID) as ProjectID,a.LastName,b.Val
from Table1 a full join Table2 b
    on 1=0;
PROJECTID LASTN VAL
     1234 Maria null
     1234 Smith null
     1234 Victo null
     1234 null    200
     1234 null    300
     1234 null    400

SQL Join Help Please

Hi there,
Thanks for checking this out.
I have a slight problm with my query. It's not causing any
errors at all, it's just not giving me the desired results I'm
trying to get.
<cfquery name="getSchemaFields" datasource="#request.dsn#"
username="#request.username#" password="#request.password#">
SELECT schema_#getSchemas.schema_token#_fields.*,
fields_content.*
FROM schema_#getSchemas.schema_token#_fields
LEFT JOIN fields_content
ON schema_#getSchemas.schema_token#_fields.field_type_uuid =
fields_content.field_content_field_uuid
WHERE fields_content.field_content_item_id =
#getSchemas.item_id#
AND fields_content.field_content_item_uuid =
'#getSchemas.item_uuid#'
</cfquery>
This query returns all the results for items in
"fields_content" where it matches in the "where" clause. But I need
the query to return all records from the
"schema_#getSchemas.schema_token#_fields" table regardless of
wether or not any records are found in the "fields_content" table.
I thought a LEFT JOIN would solve this and it does to a point.
If I remove the WHERE and AND clauses I get all the rows, but
I can't use this method because the records returned from
"fields_content" need to be specific to an ID I have in the page
(this comes from another query I do called "getSchemas").
So basically, it works but only outputs rows where it finds
it in both tables. If I take out there WHERE clause (which I need
it causes other problems with my site, I need it to only pull back
rows based on an ID)
Is this making any sense? Probably not...hope you can
understand, I'm getting mighty stressed at this one :-s
Any help whatsoever would be great.
Many thanks,
Mickey.

Hi Draves,
Thanks for your response. I think I'm getting a little closer
because now I simply get a syntax error. Like you said, I think
it's something to do with paraenthesis. My query is now as follows:
<cfquery name="getSchemaFields" datasource="#request.dsn#"
username="#request.username#" password="#request.password#">
SELECT schema_#getSchemas.schema_token#_fields.*,
fields_content.*
FROM schema_#getSchemas.schema_token#_fields
LEFT JOIN fields_content
ON schema_#getSchemas.schema_token#_fields.field_type_uuid =
fields_content.field_content_field_uuid
AND ON fields_content.field_content_item_id =
<cfqueryparam cfsqltype="cf_sql_integer"
value="#getSchemas.item_id#" />
AND ON fields_content.field_content_item_uuid =
<cfqueryparam cfsqltype="cf_sql_varchar"
value="#getSchemas.item_uuid#" />
</cfquery>
But I get the following error (a bit nicer than before - if
that makes sense, but still puzzling):
[Macromedia][SequeLink JDBC Driver][ODBC
Socket][Microsoft][ODBC Microsoft Access Driver] Syntax error
(missing operator) in query expression ''.
The error occurred in
C:\ColdFusion8\wwwroot\coldbox\edit.cfm: line 152
150 : ON
schema_#getSchemas.schema_token#_fields.field_type_uuid =
fields_content.field_content_field_uuid
151 : AND ON fields_content.field_content_item_id =
<cfqueryparam cfsqltype="cf_sql_integer"
value="#getSchemas.item_id#" />
152 : AND ON fields_content.field_content_item_uuid =
<cfqueryparam cfsqltype="cf_sql_varchar"
value="#getSchemas.item_uuid#" />
153 : </cfquery>
Hope that you'd be able to assist further. I have no clue
where to put the paranthesis - I read the links you gave but they
confused the hell out of me!! Clearly I don't consider myself a
programmer, haha.
Many thansk for your kind help!
Mickey.

Help - Bean Binding an SQL join to a gui component(jtable) in Netbeans?

Good afternoon. I'd like to ask if there is a way to data bind an SQL Join from 2 or more tables to a
GUI component(Jtable) in Netbeans. All the tutorials show is how to bind all the fields of 1 database table
to the component. Under the BIND/ELements option the IMPORT DATA TO FORM menu only allows
you to choose 1 among the database tables from a selected database.
Is there a way to configure an SQL query and attach it to the component?
Thanks.

This is not a Swing problem. Try a NetBeans forum.

SQL JOIN with BPM sql component

Hello friends.
How to use SQL JOIN with BPM sql component?
The tables objects are created but the joined tables belong to different sql components .
I tried something like that, but a error "table doesn't exist" occours.
Ex:
for each element in
SELECT imuImovelCd
FROM IMOVEIS_URBANOS,
Integracao.FGLP.IMOVEIS_PRE_EDITAIS
WHERE IMOVEIS_URBANOS.imuImovelCd = Integracao.FGLP.IMOVEIS_PRE_EDITAIS.ipeImuCd
AND Integracao.FGLP.IMOVEIS_PRE_EDITAIS.ipePedNr = 1
AND Integracao.FGLP.IMOVEIS_PRE_EDITAIS.ipePedAa = 2008
do
extend this.imoveis using cdImovel = element.imuimovelcd,
                              nrImovel = call(DEC_ENDERECO, codimovel : element.imuimovelcd, tipoimovel : 1)
end
Edited by: user9008295 on 26/01/2010 05:19

ok, ok you are right.
When I try use SQL Statement to make a JOIN with 2 tables on different sql objects, BPM returns "table dosn't exists".
So.... I change my code. I dont know if this is the best way to do, but... i hope u, or everyone, can help me to do a best work.
This code works fine.
for each element in
SELECT ipeImuCd
     FROM Integracao.FGLP.IMOVEIS_PRE_EDITAIS
     WHERE Integracao.FGLP.IMOVEIS_PRE_EDITAIS.ipePedNr = 1
     AND Integracao.FGLP.IMOVEIS_PRE_EDITAIS.ipePedAa = 2008
do
     for each element2 in
          SELECT imuImovelDv
          FROM IMOVEIS_URBANOS
          WHERE imuImovelCd = element.ipeImuCd
     do
          extend this.imoveis using cdDvImovel = String(element2.imuImovelDv),
                                        cdImovel = Decimal(element.ipeImuCd),
                                        endereco = call(DEC_ENDERECO, codimovel : element.ipeImuCd, tipoimovel : 1)
     end
end
Thx a lot!!!

Converting oracle join to Ansi sql join

Hi Guys,
I am new to SQL and trying to convert the following Oracle query (joins) into ANSI sql joins...Can someone please help me?
SELECT M.EXTERNALCODE, M.NAME AS MNAME, SC.BIRIM, SM.TRANSACTIONDATE, SMD.AMOUNT,
SMD.UNITPRICE, SM.ID AS SMID, SMD.ID AS SMDID, F.NAME AS FNAME,
IFNULL (SMD.AMOUNT, 0, SMD.AMOUNT) * IFNULL (SMD.UNITPRICE, 0, SMD.UNITPRICE) AS TOTALPRICE, SMD.AMOUNT AS RECEIVED_QUANTITY,
PD.ORDERID, PD.AMOUNT QUANTITY, PO.PROCESSDATE
FROM STOCKMAINTRANSACTION SM,
STOCKMAINTRANSACTIONDETAIL SMD,
MATERIAL M,
STOCKCARD SC,
FVSTOCK FVS,
FIRM F,
PURCHASEORDER PO,
PURCHASEORDERDETAIL PD,
PURCHASEORDERDETAILSUPPLIED PDS
WHERE SM.ID = SMD.MAINTRANSACTIONID
AND SMD.MATERIALID = M.ID
AND SMD.STOCKCARDID = SC.ID
AND SM.PROPREF = FVS.RECORDID(+)
AND FVS.FIELDID(+) = 2559
AND FVS.FLEVEL(+) = 'F'
AND F.ID(+) = SUBSTR (FVS.FVALUE, 1, 9)
AND SM.TRANSDEFID in (999,2329,2344,2370,150000903,150005362)
AND SMD.CANCELLED = 0
AND SMD.STOCKUPDATED = 1
AND SMD.ID = PDS.STOCKMAINTRANSACTIONDETAILID
AND PDS.ORDERDETAILID = PD.ORDERDETAILID
AND PO.ORDERID = PD.ORDERID
AND (M.ID = {@MATERIALID@} OR {@MATERIALID@} = 0)
AND (SM.STOREID = {@STOREID@} OR {@STOREID@} = 0)
AND (F.ID = {@SUPPLIERID@} OR {@SUPPLIERID@} = 0)
AND SM.TRANSACTIONDATE BETWEEN {@STARTDATE@} AND {@ENDDATE@}
ORDER BY F.NAME, M.EXTERNALCODE, SM.TRANSACTIONDATE
Really appreciate the help!
Thanks.

Hi,
Welcome to the forum!
To convert to ANSI syntax, replace join conditions in the WHERE clause
FROM           x
,             y
WHERE         x.x1 = y.y1
AND           x.x2 = y.y2with ON conditions in the FROM clause:
FROM           x
JOIN             y   ON    x.x1 = y.y1
                         AND   x.x2 = y.y2In inner joins, conditions that do not reference 2 tables are not really join conditions, so it doesn't matter if they are in the FROM clause or in the WHERE clause.
In your case
SM.TRANSDEFID in (999,2329,2344,2370,150000903,150005362)could be part of a join condition involving sm, or it could be in the WHERE clause. Most people find it clearer if 1-table conditions like this are in the WHERE clause.
Again, this only applies to inner joins. For outer joins, all conditions that apply to a table that may lack matching rows must be included in the FROM clause, like this:
LEFT OUTER JOIN fvstock   fvs ON   sm.propref       = fvs.recordid
                                AND fvs.fieldid = 2559
                    AND fvs.flevel   = 'F'Try it.
If you have trouble, post your best attempt, along with CREATE TABLE and INSERT statements for a little sample data from all the tables involved, and the results you want from that data. Simplify the problem. Post only the tables and columns that you don't know how to handle.
See the forum FAQ {message:id=9360002}
user8428528 wrote:
AND (M.ID = {@MATERIALID@} OR {@MATERIALID@} = 0)
AND (SM.STOREID = {@STOREID@} OR {@STOREID@} = 0)
AND (F.ID = {@SUPPLIERID@} OR {@SUPPLIERID@} = 0)
AND SM.TRANSACTIONDATE BETWEEN {@STARTDATE@} AND {@ENDDATE@}This is not valid Oracle SQL. Is {@MATERIALID@} some kind of variable?

EXEC SQL join in ABAP program

Hi All,
I am using EXEC SQL join in my ABAP report,but it is giving dump.could you please correct my following code?
START-OF-SELECTION.
CONCATENATE '%' pa_match '%' INTO tp_match.
EXEC SQL.
 OPEN dbcur FOR
 SELECT kunnr,name1, banks
 FROM kna1 as a inner join
 knbk as b
 on akunnr = bkunnr
 WHERE a.kunnr = b.kunnr and
 upper(a~name1) LIKE :tp_match
ENDEXEC.
DO.
 EXEC SQL.
 FETCH NEXT dbcur INTO :wa_name1
 ENDEXEC.
 IF sy-subrc <> 0.
 EXIT.
 ENDIF.
 APPEND wa_name1 TO ta_name1.
 COLLECT wa_name1 INTO ta_name1.
ENDDO.
EXEC SQL.
 CLOSE dbcur
ENDEXEC.

Remove the 'As' from the statement
EXEC SQL.
OPEN dbcur FOR
SELECT kunnr,name1, banks
FROM kna1 a inner join "Delete 'AS' here
knbk b
on a~kunnr = b~kunnr
WHERE a.kunnr = b.kunnr and
upper(a~name1) LIKE :tp_match
ENDEXEC.

SQL*Plus Help

Hi! Does anyone know where i can download SQL*Plus Help? I need to get info on select syntax, sql built-in functions, etc..
Thanks!

hi
you can proceed like this :
go to the OTN
the click on products.
null

ANSI SQL JOIN

Hi
How to use ANSI SQL JOINS (9i) for below query
SELECT EMP.EMPNO,EMP_T.TNO,EMP_T.SAL1 FROM EMP,EMP_T WHERE EMP.EMPNO=EMP_T.TNO
UNION ALL
SELECT EMP.EMPNO,EMP_T.TNO,EMP_T.SAL2 FROM EMP,EMP_T WHERE EMP.EMPNO=EMP_T.TNO
UNION ALL
SELECT EMP.EMPNO,EMP_T.TNO,EMP_T.SAL3 FROM EMP,EMP_T WHERE EMP.EMPNO=EMP_T.TNO
EMPNO TNO SAL1
7369 7369 100
7499 7499 1000
7566 7566 400
7782 7782 4000
7369 7369 200
7499 7499 2000
7566 7566 500
7782 7782 5000
7369 7369 300
7499 7499 3000
7566 7566 600
EMPNO TNO SAL1
7782 7782 6000
Regards
MM

SELECT EMP.EMPNO,
       EMP_T.TNO,
       EMP_T.SAL1
FROM   EMP
JOIN   EMP_T ON ( EMP.EMPNO = EMP_T.TNO )
UNION ALL
SELECT EMP.EMPNO,
       EMP_T.TNO,
       EMP_T.SAL2
FROM   EMP
JOIN   EMP_T ON ( EMP.EMPNO = EMP_T.TNO )
UNION ALL
SELECT EMP.EMPNO,
       EMP_T.TNO,
       EMP_T.SAL3
FROM   EMP
JOIN   EMP_T ON ( EMP.EMPNO = EMP_T.TNO )

OWB 10.2.0.4 ANSI SQL join problem

Hi
Its seams to me, that in OWB 10.2.0.4 there is something broken with ANSI SQL joins and instead of ANSI joins there is used oracle SQL joins only. Maybe someone can point some solutions? I can’t rewrite all mappings with union and other operators. And manually pl/sql editing also would be big problem.

"Am I correct in assuming you did not code ANSI joins?" -> yes, i am coding Oracle SQL joins and with this option just generating ANSI joins.
With ANSI SQL join you can use OR and IN operands (and code looks more readable).
It is question of performance (so for example 80% of dataset you can join by one column other 15% by second etc ..). So this all can be rewritten also in Split->join->union all, but if you have several such joins, this will be painfully.

How to install SQL*Plus help facilities and demos.

Hi, everyone
It appears error message say "failure to login" during SQL*Plus
part of the Oracle8 full installation. I knew that system want
to install SQL*Plus help and demos through logining one of
dba account(maybe system user account). However, due to
password's reason, can not log in SQL*Plus, so installer can't
execute named pupbld.sql script, result in SQL*Plus help and
demos can not be installed.
Now, I am intend to install these stuff lonely.
Could anyone help me? thank a lot.
William
null

Hi,
The pupbld.sql isn't the correct script to create the help
facility, it just creates product and user profile tables.
The help script is at $ORACLE_HOME/sqlplus/admin/help (run as
system)
cd $ORACLE_HOME/sqlplus/admin/help
sqlplus system/<password> @helptbl
sqlldr system/<password> control=plushelp.ctl
sqlldr system/<password> control=plshelp.ctl
sqlldr system/<password> control=sqlhelp.ctl
sqlplus system/<password> @helpindx
I think it is necessary to run the pupbld.sql script, without
this script everyone who logins in oracle with sqlplus will see
an error message, but... Run the script again:
$ORACLE_HOME/sqlplus/admin/pupbld.sql
Best regards,
Ari
William (guest) wrote:
: Hi, everyone
: It appears error message say "failure to login" during SQL*Plus
: part of the Oracle8 full installation. I knew that system want
: to install SQL*Plus help and demos through logining one of
: dba account(maybe system user account). However, due to
: password's reason, can not log in SQL*Plus, so installer can't
: execute named pupbld.sql script, result in SQL*Plus help and
: demos can not be installed.
: Now, I am intend to install these stuff lonely.
: Could anyone help me? thank a lot.
: William
null

Will Oracle pl/sql certification help me get IT job

Hello guys,
I have completed my B.tech in Computer Science, I am confused a bit , Can i get a job after getting certified in Oracle Associate Pl/sql developer

1005323 wrote:
Hello guys,
I have completed my B.tech in Computer Science, I am confused a bit , Can i get a job after getting certified in Oracle Associate Pl/sql developerYou may get a job after achieving Pl/sql developer OCA
You may get a job after without achieving Pl/sql developer OCA
You may fail to get a job after achieving Pl/sql developer OCA
You may fail to get a job after without achieving Pl/sql developer OCA
There are several factors involved in getting a job. And there are several ways a job may be obtained. But usually there are there stages:
- Stage Zero: A company but has a job to offer.
- And you need to be aware of it. - A friend may tell you, or an agency may tell you. And it must suit you for location and remuneration etc.
- Stage one: An interview is obtained with the company.
- Stage two: The job is offered to you rather than anyone else and you find it acceptable.
So ... to your question:
"Can i get a job after getting certified in Oracle Associate Pl/sql developer?"
Well .... there is only three possible answers ... yes, no, and maybe; and maybe is probably the only correct answer, and most people will have worked this out, which means the question may have not been the best question to have asked.
(( That said I now read the title of the thread and it says: Re: Will Oracle pl/sql certification help me get IT job)
I have been known on occasion to have been given a question by a boss.
And I have answered him:
"You have given me the wrong question
The question you should have answer me is this.
And the answer I will give you is this."
And the boss goes away happy
So you you a better question would have been:
How much will an OCA PL/SQL certification increase my chances of getting a job?
Mind you even that question won't help you get a much better answer.
For a proportion of jobs where PL/SQL is relevant that will help (for those where it is not it might be occasionally be a problem), for people with identical CV's it sometimes might help get to interview stage. But there are other factors as well. For instance if I was thinking of giving you a job on the basis of your post I might for example:
- Not be impressed with an "Hello Guys" greeting ( though this is a forum so that isn't relevant here).
- Not be impressed with you being confused.
- etc.
You probably need to get a good appreciation of the job market in your locality; and the numbers of applicants for each job. Which jobs you can apply for, what is your skillset and knowing youself as well.
Sometimes an ITIL certification may be a better differentiator for some positions in business. But it will depend on the job you can think you can get.

(SQL*PLUS HELP) RUNNING PUPBLD OR HELPINS ASKS FOR SYSTEM_PASS

제품 : ORACLE SERVER
작성날짜 : 2002-04-22
(SQL*PLUS HELP) RUNNING PUPBLD OR HELPINS ASKS FOR SYSTEM_PASS
==============================================================
PURPOSE
이 내용은 SQL*Plus 상에서 SQL*Plus command의 help를 보기 위한 방법이다.
Problem Description
SQL*Plus command의 help를 보기 위해서 helpins를 수행하면
SYSTEM_PASS is not set이라는 에러 메시지가 발생하는 경우가 있다.
이 자료는 pupbld 또는 helpins를 수행하기 전에 SYSTEM_PASS 환경변수를
셋팅하는 방법에 대한 자료이다.
아래와 같은 에러가 발생하는 경우 조치 방법에 대해 알아본다.
SYSTEM_PASS not set.
Set and export SYSTEM_PASS, then restart help (for helpins or
profile for pupbld) installation.
Workaround
none
Solution Description
이 스크립트는 system user로 database에 connect되어 수행되어야 한다.
helpins를 수행하기 위해서는 SYSTEM_PASS 환경변수가 셋팅되어 있어야 한다.
NOTE
For security reasons, do not set this variable in your shell
startup scripts. (i.e. .login or .profile.).
Set this environment variable at the prompt.
1. Prompt에서 환경변수를 셋팅하기
For C shell:
% setenv SYSTEM_PASS system/<password>
For Korn or Bourne shells:
$ SYSTEM_PASS=system/<password> ;export SYSTEM_PASS
2. Now run "$ORACLE_HOME/bin/pupbld" or "$ORACLE_HOME/bin/helpins".
% cd $ORACLE_HOME/bin
% pupbld
or
% helpins
주의사항
$ORACLE_HOME/bin/pupbld 스크립트와 $ORACLE_HOME/bin/helpins 스크
립트를 수행하기 위해서는 반드시 SYSTEM_PASS 환경변수를 필요로 한다.
Reference Document
<Note:1037075.6>

check it please whether it is a database version or just you are installing a client. Install Enterprize database on 2k system. I you are running a client software then you are to deinstall it.

Download Oracle SQL*Plus help related like word help

Hello all
I just wanna ask if where i can download Oracle SQL*Plus help related like word help.?
ty

You can access SQL*Plus help from the command line in a SQL*Plus session by typing 'help index'. If you want more information than that, take a look at the SQL*Plus Quick Reference located here or the SQL*Plus User's Guide and Reference located here. These docs are all for Oracle 10g. Other version documentation can be found here.
Tom

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