Update Query Joining Two Tables

What is the sql for updating a table with another table's field value. I accomplished this using a subquery, but the query took forever to run. I was hoping there was a way to accomplish this inner join more efficiently.

One way:
UPDATE TABLEA A
SET (COLUMNA, COLUMNB) = (SELECT COLUMNA, COLUMNB FROM TABLEB B WHERE (A.KEYCOLUMN1 = B.KEYCOLUMN1)
WHERE EXISTS (SELECT 'X' FROM TABLEB B WHERE A.KEYCOLUMN1 = B.KEYCOLUMN1);
1. The subquery should join on columns that are indexed. Use EXPLAIN PLAN to look at your query to determine if indexes are being used.
2. The last WHERE clause ensures that you are only updating rows in TABLEA that have data in TABLEB. Without this clause COLUMNA and COLUMNB will be set to NULL if the subquery returns no rows; this will destroy any existing values in these columns.
3. The "SELECT 'X'" in the last WHERE clause (rather than "SELECT (1)" or "SELECT *") tells Oracle that no data needs to be retrieved into buffers but that only the condition needs to be examined.
Good luck!
null

Similar Messages

Optimizing the Query joining two tables multiple times

Hi all,
I need to formulate a query where I want to get data from two tables.Here are the table structures and sample data.
Table1
id firstname lastname accountnumber
1 Sridh Peter SP456
2 Gane San SS667
3 Sway patel PP345
Table 2
id attributename attributevalue
1 Manager Mike
1 Lawyer Schwa
1 Server maneka
1 location langur
1 System Novel
2 Manager kane
2 lawyer endun
2 location colrado
3 server queen
3 system elanda
The requirement is I need to generate a report like th follwoing
Accountnumber firstname lastname manager lawyer System Server location
SP456 Sridh Peter Mike schwa Novel maneka langur
SS667 Gane San kane endun colrado
Now I have done this report using a query where I join table1 and table2 multiple times to get the report's data. And that query only works If the user has all attributes.If any one attribut is missing it wont work.Can some onehelp me with this.
The query i am using looks like this.
select a.accountnumber,a.firstname,a.lastname,b.attributevalue,c.attributevalue, d.attributevalue, e.attributevalue,f.attributevalue from table1 a,table2 b where a.id=b.id and a.id=c.id and a.id=d.id and a.id=e.id and a.id=f.id and b.attributename ='manager' and c.attributename ='lawyer' and d.attributename='system' and e.attributename='server' and f.attributename='location'
this query works well if a user has all attributes ,if any one is missing he is not shown in the report.Can some one suggest me a good way of querying than this.
The query I am using is also taking lot of time..I think I have explained my question well ,please reply if you have questions.
Thanks for reading till here patiently,
Pandu

....if this .....
<DIV>
select
Accountnumber||' '||firstname||' '||lastname||'
'||manager||' '||System||' '||Server||' '||location from (select
* 
from (select '1'
id, 'Sridh' firstname, 'Peter' lastname, 'SP456'
accountnumber from dual union 
select '2' id, 'Gane' firstname, 'San' lastname, 'SS667' accountnumber from dual union select
'3' id, 'Sway' firstname, 'patel' lastname, 'PP345' accountnumber from dual) x, 
(select * from
(select id, attributename, 
lead(attributevalue,0) over (partition by id order
by id) as Manager, 
lead(attributevalue,1) over (partition by id order
by id) as Lawyer, 
lead(attributevalue,2) over (partition by id order
by id) as System, 
lead(attributevalue,3) over (partition by id order
by id) as
Server, 
lead(attributevalue,4) over
(partition by id
order by id) as Location 
from (select *
from
(select '1' id, 'Manager' attributename, 'Mike' attributevalue from dual union select
'1' id, 'Lawyer' attributename, 'Schwa'
attributevalue from dual union select
'1' id, 'Server' attributename, 'maneka'
attributevalue from dual union 
select '1' id, 'location' attributename, 'langur' attributevalue from dual union 
select '1' id, 'System' attributename, 'Novel' attributevalue from dual union select
'2' id, 'Manager' attributename, 'kane'
attributevalue from dual union select
'2' id, 'lawyer' attributename, 'endun'
attributevalue from dual union 
select '2' id, 'location' attributename, 'colrado' attributevalue from dual union select
'3' id, 'server' attributename, 'queen'
attributevalue from dual union select
'3' id, 'system' attributename, 'elanda'
attributevalue from dual) order
by id, (case when attributename='Manager' then
1 
when attributename='Lawyer' then 2 
when attributename='System' then 3 
when attributename='Server' then 4 
when attributename='Location' then 5 end) asc)) 
where attributename='Manager')
y where x.id(+)=y.id)</DIV>
< Jonel

SAP Query - Joining two tables - SQVI, SQ01

Hi gurus,
Can anybody send word documentation of joining any two tables. (Variant creation). Simple and easy to understand with screen shots step by step procedure.

Got the doc from Google.

Joining two tables, sql query

This is a newbie question! I would like to join two tables. Table_1 contains xml stylesheets:
id stylesheet doc
1 <xml stylesheet doc A>
2 <xml stylesheet doc B>
And Table_2 contains the XML documents that the stylesheets will transform:
id XML doc
1 <XML document 1>
1 <XML document 2>
1 <XML document 3>
2 <XML document 4>
2 <XML document 5>
I would like <xml stylesheet doc A> to transform only XML doc that have an id of 1, so I tried this sql statement:
select a.stylesheet_doc ,b.xml_doc from Table_1 a, Table_2 b where a.id=b.id and a.id=1;
This statement returns the rows I want (stylesheet doc with id equals 1, and xml_doc with id equals 1), but it pairs each xml document with a style sheet.
stylesheet doc A <XML document 1>
stylesheet doc A <XML document 2>
stylesheet doc A <XML document 3>
My question is, is there a way to have a result that looks like this?
stylesheet doc A
<XML document 1>
<XML document 2>
<XML document 3>
That is, is there a way in sql to get rid of duplicate stylesheet doc A?
I have tried group by and rollup and xmlagg.
Thank you very, very much for your help.
Jim

Hi, Jim,
Welcome to the forum!
You just want to display the XML, not actually transform it, right?
GROUP BY ROLLUP should work, but I find it easier with GROUP BY GROUPING SETS. Here's an example from tables in the scott schema:
SELECT CASE
 WHEN GROUPING (ename) = 1
 THEN d.dname
 END AS dname
, e.ename
FROM scott.dept d
JOIN scott.emp e ON d.deptno = e.deptno
GROUP BY GROUPING SETS ( (d.dname, e.ename)
 , (d.dname)
ORDER BY d.dname
, ename NULLS FIRST
;Output:
DNAME ENAME
ACCOUNTING
 CLARK
 KING
 MILLER
RESEARCH
 ADAMS
 FORD
 JONES
 SCOTT
 SMITH
SALES
 ALLEN
 BLAKE
 JAMES
 MARTIN
 TURNER
 WARDYou may have noticed that this site noramlly compresses whitespace.
Whenever you post formatted text (such as query results) on this site, type these 6 characters:
\(small letters only, inside curly brackets) before and after each section of formatted text, to preserve spacing.

Outer join two tables with query search record attached to both tables

When I create a query with two tables that have query search records attached with outer join, PS seems to do a natural join (cartesian). We are on PT8.48.
Is there a workaround for this issue. I do not want to remove query search record on either of the tables.
I am trying to create an Emergency contact report. I am using two tables PS_EMPLOYEES and PS_EMERGENCY_CNTCT. Here is the sql PeopleSoft query generated when I did Left outer Join.
Query SQL:
SELECT A.EMPLID, A.NAME, A.ADDRESS1, A.CITY, B.PRIMARY_CONTACT, B.ADDRESS1, B.CITY, B.STATE, B.POSTAL, B.RELATIONSHIP, A.DEPTID, A.JOBCODE, A.COMPANY, A.EMPL_TYPE
FROM (PS_EMPLOYEES A LEFT OUTER JOIN PS_EMERGENCY_CNTCT B ON A.EMPLID = B.EMPLID ), PS_EMPLMT_SRCH_QRY A1, PS_PERS_SRCH_QRY B1
WHERE A.EMPLID = A1.EMPLID
AND A.EMPL_RCD = A1.EMPL_RCD
AND A1.OPRID = 'SREESR'
AND (B.EMPLID = B1.EMPLID OR B.EMPLID IS NULL )
AND B1.OPRID = 'PS'
Appreciate any help.

I think there are fixes for this issue in later tools releases (Report ID 1544345000). I'm not sure about 8.48, but you might try the workaround documented in
E-QR: Left Outer Joins with Security Records are returning unexpected results [ID 651252.1]
on Oracle Support.
Regards,
Bob

Joining two tables having no common fields using one select query

Hi Experts,
How to join two tables which are NOT having any field in common using only one select query?
Your help will be appreciated.
Thank you.

Identify a third table (or more tables) with common fields with your two tables, or change your question either removing JOIN or removing NO COMMON FIELDS, else you wont get many responses and will be left alone in outer space, as suggested by Thomas.
If you acturally require what you written, better execute two select and merge the two internal tables merging every record from first table with every record of second table, til no more memory is available.
Regards,
Raymond

How to prevent Oracle from using an index when joining two tables ...

How to prevent Oracle from using an index when joining two tables to get an inline view which is used in an update statement?
O.K. I think I have to explain what I mean:
When joining two tables which have many entries sometimes it es better not to use an index on the column used as join criteria.
I have two tables: table A and table B.
Table A has 4.000.000 entries and table B has 700.000 entries.
I have a join of both tables with a numeric column as join criteria.
There is an index on this column in table A.
So I instead of
where (A.col = B.col)I want to use
where (A.col+0 = B.col)in order to prevent Oracle from using the index.
When I use the join in a select statement it works.
But when I use the join as inline view in an update statement I get the error ORA-01779.
When I remove the "+0" the update statement works. (The column col is unique in table B).
Any ideas why this happens?
Thank you very much in advance for any help.
Regards Hartmut

I think you should post an properly formatted explain plan output using DBMS_XPLAN.DISPLAY including the "Predicate Information" section below the plan to provide more details regarding your query resp. update statement. Please use the \[code\] and \[code\] tags to enhance readability of the output provided:
In SQL*Plus:
SET LINESIZE 130
EXPLAIN PLAN FOR <your statement>;
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);Usually if you're using the CBO (cost based optimizer) and have reasonable statistics gathered on the database objects used the optimizer should be able to determine if it is better to use the existing index or not.
Things look different if you don't have statistics, you have outdated/wrong statistics or deliberately still use the RBO (rule based optimizer). In this case you would have to use other means to prevent the index usage, the most obvious would be the already mentioned NO_INDEX or FULL hint.
But I strongly recommend to check in first place why the optimizer apparently seems to choose an inappropriate index access path.
Regards,
Randolf
Oracle related stuff:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle:
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

Need help to join two tables using three joins, one of which is a (between) date range.

I am trying to develop a query in MS Access 2010 to join two tables using three joins, one of which is a (between) date range. The tables are contained in Access. The reason
the tables are contained in access because they are imported from different ODBC warehouses and the data is formatted for uniformity. I believe this cannot be developed using MS Visual Query Designer. I think writing a query in SQL would be suiting this project.
ABCPART links to XYZPART. ABCSERIAL links to XYZSERIAL. ABCDATE links to (between) XYZDATE1 and ZYZDATE2.
[ABCTABLE]
ABCORDER
ABCPART
ABCSERIAL
ABCDATE
[ZYXTABLE]
XYZORDER
XYZPART
XYZSERIAL
XYZDATE1
XYZDATE2

Thank you for the looking at the post. The actual table names are rather ambiguous. I renamed them so it would make more sense. I will explain more and give the actual names. What I do not have is the actual data in the table. That is something I don't have
on this computer. There are no "Null" fields in either of the tables.
This table has many orders (MSORDER) that need to match one order (GLORDER) in GLORDR. This is based on MSPART joined to GLPART, MSSERIAL joined to GLSERIAL, and MSOPNDATE joined if it falls between GLSTARTDATE and GLENDDATE.
[MSORDR]
MSORDER
MSPART
MSSERIAL
MSOPNDATE
11111111
4444444
55555
2/4/2015
22222222
6666666
11111
1/6/2015
33333333
6666666
11111
3/5/2015
This table has one order for every part number and every serial number.
[GLORDR]
GLORDER
GLPART
GLSERIAL
GLSTARTDATE
GLENDDATE
ABC11111
444444
55555
1/2/2015
4/4/2015
ABC22222
666666
11111
1/5/2015
4/10/2015
AAA11111
555555
22222
3/2/2015
4/10/2015
Post Query table
GLORDER
MSORDER
GLSTARTDATE
GLENDDATE
MSOPNDATE
ABC11111
11111111
1/2/2015
4/4/2015
2/4/2015
ABC22222
22222222
1/5/2015
4/10/2015
1/6/2015
ABC22222
33333333
1/5/2015
4/10/2015
3/5/2015
This is the SQL minus the between date join.
SELECT GLORDR.GLORDER, MSORDR.MSORDER, GLORDR.GLSTARTDATE, GLORDR.GLENDDATE, MSORDR.MSOPNDATE
FROM GLORDR INNER JOIN MSORDR ON (GLORDR.GLSERIAL = MSORDR.MSSERIAL) AND (GLORDR.GLPART = MSORDR.MSPART);

Using a view to join two tables

Thank you in advance for any advice you can lend.
I am using this code in my MySQL db to create a view.
select
    job.id as job_id,
    umr_cost_calculation.plant_name,
    max(umr_cost_calculation.id) as max_id
from
    job,
    umr_cost_calculation
where
    job.id = umr_cost_calculation.job_id
group by job.id , umr_cost_calculation.plant_name
I did this so I can join two tables and pull in the most current cost data for a specific plant. The report will, at times, show the wrong (older) data. I can re-run the report, filter to just the one job and see again the wrong data. When I add the max_id to the report, it display the id and updates the report with the correct data. It appears that the view was stale and by adding the ID to the report this fixed the issue.
1) Is this the best way to make this join? I don't see how Crystal supports a subquery to make a join (this is why I used the view).
2) If I leave the max_id on the report, will this force the view to always update?

Try:
Select
D1.EmpLoginID,
Count(D1.ID),
Count(D1.AlarmCode),
D1.EmpName,
D1.EmpAddress,
D2.Db2Count
FROM DB1.Data D1
LEFT JOIN (SELECT
empLoginID, Count(*) as Db2Count
FROM DB2.ALL_Database
WHERE site = 'Atlanta'
GROUP BY empLoginID
) D2
ON D1.EmpLoginID = D2.EmpLoginID
GROUP BY D1.empLoginID, D1.EmpName, D2.EmpAddress, D2.Db2Count
Order BY D1.empLoginID ASC
For every expert, there is an equal and opposite expert. - Becker's Law
My blog
My TechNet articles

How do you join two tables from different Oracle schemas using a subquery

I am trying to join two tables from different Oracle schemas using a subquery. I can extract data from each of the tables without a problem. However, when I combine the select statements using a subquery I get the Oracle error *'ORA-00936: missing expression'*. Since each SELECT statement executes on its own without error I don't understand what is missing. The result set I am trying to get is to match up the LINE_ID from PDTABLE_12_1 in schema DD_12809 with the MAT_DESCRIPTION from table PDTABLE_201 in schema RA_12809.
The query is as follows:
sql = "SELECT [DD_12809].[PDTABLE_12_1].LINE_ID FROM [DD_12809].[PDTABLE_12_1] JOIN " _
+ "(SELECT [RA_12809].[PDTABLE_201].MAT_DESCRIPTION " _
+ "FROM [RA_12809].[PDTABLE_201]) AS FAB " _
+ "ON [DD_12809].[PDTABLE_12_1].PIPING_MATER_CLASS = FAB.PIPING_MATER_CLASS"
The format of the query is copied from a SQL programming manual.
I also tried executing the query using a straight JOIN on the two tables but got the same results. Any insight would be helpful. Thanks!
Edited by: user11338343 on Oct 19, 2009 6:55 AM

I believe you are receiving the error because you are trying to JOIN on a column that doesn't exist. For example you are trying to join on FAB.PIPING_MATER_CLASS but that column does not exist in the subquery.
If you want to do a straight join without a subquery you could do the following
SELECT DD_12809.PDTABLE_12_1.LINE_ID
,       FAB.MAT_DESCRIPTION
FROM    DD_12809.PDTABLE_12_1
JOIN    RA_12809.PDTABLE_201    AS FAB ON DD_12809.PDTABLE_12_1.PIPING_MATER_CLASS = FAB.PIPING_MATER_CLASS HTH!

Creating a external content type for Read and Update data from two tables in sqlserver using sharepoint designer

Hi
how to create a external content type for Read and Update data from two tables in sqlserver using sharepoint designer 2010
i created a bcs service using centraladministration site
i have two tables in sqlserver
1)Employee
-empno
-firstname
-lastname
2)EmpDepartment
-empno
-deptno
-location
i want to just create a list to display employee details from two tables
empid firstname deptno location
and same time update in two tables
adil

When I try to create an external content type based on a view (AdventureWorks2012.vSalesPerson) - I can display the data in an external list. When I attempt to edit it, I get an error:
External List fails when attached to a SQL view
Sorry, something went wrong
Failed to update a list item for this external list based on the Entity (External Content Type) 'SalesForce' in EntityNamespace 'http://xxxxxxxx'. Details: The query against the database caused an error.
I can edit the view in SQL Manager, so it seems strange that it fails.
Any advice would be greatly GREATLY appreciated.
Thanks,
Randy

How do I join two tables in the same database and load the result into a destination table in a SSIS package

Hi,
I have a query that joins two tables in the same database, the result needs to be loaded in a destination DB table. How do I do this in SSIS package?
thank you !
Thank You Warmest Fanny Pied

Please take a look at these links related to your query.
http://stackoverflow.com/questions/5145637/querying-data-by-joining-two-tables-in-two-database-on-different-servers
http://stackoverflow.com/questions/7037228/joining-two-tables-together-in-one-database

Can't write right sql query by two tables

Hello
Everyone,
I am trying to get a sql query by two tables,
table:container
<pre class="jive-pre">
from_dest_id number
ship_from_desc varchar
to_dest_id number
</pre>
table: label_fromat (changeless)
<pre class="jive-pre">
SORT_ORDER number
PREFIX varchar2
VARIABLE_NAME varchar2
SUFFIX varchar2
LF_COMMENT varchar2
</pre>
the sql which i need is
a. table CONTAINER 's each column should have LABLE_FORMAT 's PREFIX before and SUFFIX back ,and these columns is connected
example : the query output should be like this :
<pre class="jive-pre">
PREFIX||from_dest_id||SUFFIX ||PREFIX||ship_from_desc||SUFFIX ||PREFIX|| to_dest_id||SUFFIX
</pre>
every PREFIX and SUFFIX are come from LABEL_FORMAT's column VARIABLE_NAME (they are different)
column SORT_ORDER decide the sequence, for the example above: Column from_dest_id order is 1, ship_from_desc is 2,to_dest_id is 3
b. table LABEL_FORMAT's column VARIABLE_NAME have values ('from_dest_id','ship_from_desc','to_dest_id')
If table CONTAINER only have one record i can do it myself,
But actually it is more than one record,I do not know how to do
May be this should be used PL/SQL,or a Function ,Cursor ,Procedure
I am not good at these
Any tips will be very helpful for me
Thanks
Saven

Hi, Saven,
Presenting data from multiple rows as a single string is called String Aggregation . This page:
http://www.oracle-base.com/articles/10g/StringAggregationTechniques.php
shows many ways to do it, suited to different requirements, and different versions of Oracle.
In Oracle 10 (and up) you can do this:
SELECT REPLACE ( SYS_CONNECT_BY_PATH ( f.prefix || ' '
 || CASE f.variable_name
 WHEN 'FROM_DEST_ID'
 THEN from_dest_id
 WHEN 'SHIP_FROM_DESC'
 THEN ship_from_desc
 WHEN 'TO_DEST_ID'
 THEN to_dest_id
 END
 || ' '
 || f.suffix
 , '~?'
 , '~?'
 ) AS output_txt
FROM container c
CROSS JOIN label_format f
WHERE CONNECT_BY_ISLEAF = 1
START WITH f.sort_order = 1
CONNECT BY f.sort_order = PRIOR f.sort_order + 1
 AND c.from_dest_id = PRIOR c.from_dest_id
saven wrote:If table CONTAINER only have one record i can do it myself,
But actually it is more than one record,I do not know how to do In that case, why did you post an example that only has one row in container?
The query above assumes
something in container (I used from_dest_id in the example above) is unique,
you don't mind having a space after prefix and before from_dest_id,
you want one row of output for every row in container, and
you can identify some string ('~?' in the example above) that never occurs in the concatenated data.

Joining two tables in PL/SQL

Hi there,
I have two problems...first being:
We are trying to run a sub-query within a WHERE/AND clause. I am not sure on the correct syntax on how to run the sub-query as denoted in the code below. Secondly I am trying to join two tables with a common column name (ie: CIPIDI_NR). Considering I cant fix the first problem I cant test out the sub-query. So any help on either would be grateful. Cheers
Select *
from TBL_CIPIDI
     WHERE CIPIDI_NR like nvl ('in_case_number%', CIPIDI_NR)
AND CIPIDI_NAME like nvl ('in_case_name%', CIPIDI_NAME)
AND COST_CENTRE LIKE NVL ('in_cost_centre%', COST_CENTRE)
AND CIPIDI_DESCRIPTION like nvl ('in_description%', CIPIDI_DESCRIPTION)
AND CLAIMANT_NAME LIKE NVL ('in_claimant%', CLAIMANT_NAME)
AND REQUESTOR LIKE NVL ('in_requestor%', REQUESTOR)
AND PROJECT_MANAGER LIKE NVL ('in_project_manager%', PROJECT_MANAGER)
AND TEAM_LEADER LIKE NVL ('in_team_leader%', TEAM_LEADER)
     AND ********RUN THE QUERY BELOW************
SELECT C1.CIPIDI_NR, C2.CIPIDI_NR
from TBL_TEAM_MEMBERS C1, TBL_CIPIDI C2
     WHERE C1.CIPIDI_NR = C2.CIPIDI_NR
     AND TEAM_MEM_NAME LIKE NVL ('in_team_mem_name%', TEAM_MEM_NAME)
);

You really need to start providing create table and insert statements for tables and sample data for testing, the results that you want based on that data in order to clarify the problem, your Oracle version, and a copy and paste of an attempted run of your code, complete with any error messages received. The following is my best guess at what you might be looking for.
Select *
from   TBL_TEAM_MEMBERS C1, TBL_CIPIDI C2
WHERE C1.CIPIDI_NR = C2.CIPIDI_NR
AND    c1.CIPIDI_NR          like nvl (in_case_number     || '%', c1.CIPIDI_NR)
AND    c1.CIPIDI_NAME        like nvl (in_case_name       || '%', c1.CIPIDI_NAME)
AND    c1.COST_CENTRE        LIKE NVL (in_cost_centre     || '%', c1.COST_CENTRE)
AND    c1.CIPIDI_DESCRIPTION like nvl (in_description     || '%', c1.CIPIDI_DESCRIPTION)
AND    c1.CLAIMANT_NAME      LIKE NVL (in_claimant        || '%', c1.CLAIMANT_NAME)
AND    c1.REQUESTOR          LIKE NVL (in_requestor       || '%', c1.REQUESTOR)
AND    c1.PROJECT_MANAGER    LIKE NVL (in_project_manager || '%', c1.PROJECT_MANAGER)
AND    c1.TEAM_LEADER        LIKE NVL (in_team_leader     || '%', c1.TEAM_LEADER)
AND    TEAM_MEM_NAME         LIKE NVL (in_team_mem_name   || '%', TEAM_MEM_NAME);

Join two table in different instance

Hi,
I have two table in different instance .
IMEI in instance A
RCA_SMART_CARD in instance B
Below is the desc table :
SQL> desc RCA_SMART_CARD;
Name Null? Type
N_CARD_ID NOT NULL NUMBER(10)
C_CARD_SERIAL_NUMBER NOT NULL VARCHAR2(20)
C_SIM_MSISDN VARCHAR2(20)
C_SIM_IMSI VARCHAR2(20)
C_LINKED_CARD VARCHAR2(20)
N_PRO_IDENTIFIER NOT NULL NUMBER(4)
C_CARD_TYPE VARCHAR2(1)
N_SIM_STATE NUMBER(1)
N_EEPROM_SPACE_LEFT NUMBER(9)
N_VOLATILE_SPACE_LEFT NUMBER(9)
N_NONVOLATILE_SPACE_LEFT NUMBER(9)
N_CARD_OPTI NOT NULL NUMBER(15)
N_PRODUCT_ID NUMBER(10)
D_CREATION_DATE DATE
D_MODIFICATION_DATE DATE
D_STATUS_MODIFICATION_DATE DATE
SQL> desc IMEI;
Name Null? Type
MSISDN NOT NULL VARCHAR2(20)
IMEI NOT NULL VARCHAR2(16)
DATE_MOD NUMBER(13)
IMSI VARCHAR2(18)
ICCID VARCHAR2(20)
T_PROF RAW(20)
EXTRA_DATA VARCHAR2(100)
If I want to join two table together .
I want to search the number of record in IMEI that have N_SIM_STATE =1 in RCA_SMART_CARD .
The MSISDN in IMEI is equal to C_SIM_MSISDN in RCA_SMART_CARD .
How can I do and what is the sql statment ??
Please advice .

First you need to decide, from where you want to execute the query.
Let us assume it is instance A(as per your example).
Then what you need to do is:
1. Create database link to instance B
*[url http://www.stanford.edu/dept/itss/docs/oracle/10g/server.101/b10759/statements_5005.htm]Here* is the semantics.
2. After creating the database link to instance B, you can achieve the result set by running the below query:
 SQL> select count(*) from IMEI t1 join RCA_SMART_CARD@<db_link_name> t2 on t1.MSISDN = t2.C_SIM_MSISDN where t2.N_SIM_STATE = 1
 Hope it helps!
Cheers,
AA

Update Query Joining Two Tables

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