SQL Count query - Assistance needed

Similar Questions

• SQL Dev 2.1 connected to a SQL Server query

  I use developer SQL to query the oracle db and the results of the query, if I right click I get the following options;
  
  Save grid under the report...
  Single record view...
  Number of lines...
  Find/highlight...
  Export data
  
  However, when I do this on a SQL Server I get only the following:
  
  Save the grid in the report...-c' is grayed out and cannot be used.
  Single record view...
  Number of lines...
  Find/highlight...
  
  I don't get the option to export, do anyone know why? or what I can do to get it?

  With SQL Developer 2.1.0 export feature has been removed for all with oracle database.

  In section 2.1.1 export feature works again if you need to export to SQL server, you should switch to 2.1.1.

• I need assistance of query SQL, a query to get the same without union clause

  EmpNo, ename sum (sal) sum (deptno)
  200-2000-10 Tom
  201 3000 10 smith
  Alfred 202 20 3000
  40 8000 total

  select NVL(TO_CHAR(employee_id), 'Total'),
         max(last_name),
         sum(salary),
         sum(department_id)
    from employees
   group by rollup(employee_id), ()
  

• assistance needed for a complex query

  Hi guys

  I need your help to write the sql query where I fill in null values when they are in the meantime, as you can see that the same data are for 2 ID... I am able to fill a value zero for id 101 as it's the last with the sql query below... but not able to do the same thing with when null values are between the two...

  for id 102, if the value null line si la valeur null ligne date date is greater than or equal to the date of the previous row and fill in with the previous row null value... and if, as in the case of ord = '5' it is identical to the date of the next line, then I need to fill it with the next value of line WD...

  Let me know if you need more information;

  CREATE TABLE tt (id INT, int DSB, date the t1d, int WD)

  INSERT INTO tt VALUES (101, '1','2011-12-20', '484')
  INSERT INTO tt VALUES (101, '2','2011-02-12', '444')
  INSERT INTO tt VALUES (101, '3','2011-02-12', '444')
  INSERT INTO tt VALUES (101, '4','2011-02-14', NULL)

  INSERT INTO VALUES of tt (102, '1','2013-05-27', '544')
  INSERT INTO VALUES of tt (102, '2','2013-06-02', '544')
  INSERT INTO VALUES of tt (102, '3','2013-06-03', NULL)
  INSERT INTO VALUES of tt (102, '4','2013-06-10', NULL)
  INSERT INTO VALUES of tt (102, '5','2013-07-08', NULL)
  INSERT INTO VALUES of tt (102, '6','2013-07-08', '690')
  INSERT INTO VALUES of tt (102, '7','2013-07-10', '690')

  Select * from tt

  SELECT nvl (WD, FINAL_WD) F_wd, * FROM
  (
  Select *,.
  FINAL_WD = (SELECT b.wd
  TT b
  WHERE b.id = a.id
  and b.ord + 1 = a.ord
  and rownum = 1
  ORDER BY b.ord desc)
  TT one
  WHERE a.wd is null
  ) D

  Hello

  Thanks for posting the sample data.  Be sure to post the results desired from these data.

  If ord and wd are numbers, then don't try to insert the strings (for example, '1') in these columns.  It goes same for t1d, but even more.  If t1d is a DATE, then insert only values, not DATE strings such as "2010-12-20'. TO_DATE allows to convert a string to a DATE, or use literals DATE.   All your INSERT statements cause errors on my system because you are using the wrong type of data.

  Maybe the analytical LAST_VALUE function can help you:

  SELECT id, DSB

  t1d

  LAST_VALUE (WD IGNORE NULLS) over (PARTITION BY ID.

  ORDER BY t1d

  WD NULLS LAST

  ) AS new_wd

  TT

  ORDER BY id

  t1d

  ;

• Need of a just rows in table using SQL counter bearing

  Oracle 11 g 2

  RHEL 6.4

  ---------------

  Given the following table data:

  EMPLOYEE HIRE_DATE TERM_DATE DEPT

  ------------------     -----------------     ------------------      ---------

  John Doe 01/01/13 101

  Jane Smith 05/01/13 102

  Bob Jones 102 02/04/13, 22/04/13

  Jenny Boo 03/12/13 03/31/13 103

  Joe Schmoe 24/03/13 102

  Bill Max 23/04/13 103

  Jill clay 24/04/13 103

  Joe Boom 11/05/13 102

  I want to return the number of employees who work for each month, as long as they were hired at anytime during the month and what if they ended this month (ie the month worries me).  So I would expect

  EMPLOYEE OF THE MONTH

  Jan 2

  3 Feb

  5 March

  April 6 (Jenny Boo ended)

  May 6 (Jenny Boo and Bob Jones have been completed)

  I know there are bright people out there who are SQL expert, but I'm not one of them.  If there is a way to do this in SQL just I would like to see it.

  Hello stew,.

  Thanks for your reply.  Looking at your SQL, where did you get the column "cnt"?  I don't see that in any table, physical or virtual.

  It is in the clause "unpivot" of the request he posted.

  Create the table "emp1" and the data that Martin condition and then run the query that provided stew.

  Works for me:

  Select to_char (Lun, ' FMMonth, YYYY') month,

  Sum (Sum (TO_NUMBER (CNT))) more employees (command per LUN)

  de)

  Select trunc (hire_date, 'MM') "1."

  trunc (ADD_MONTHS(term_date,1), 'MM') '-1 '.

  from emp1

  ) a

  UNPIVOT (LUN for NTC in ("1", "-1"))

  LUN group

  order by Lun;

  Header 1	Header 2
  MONTH

  EMPLOYEES January 2013 2 February 2013 3 March 2013 5 April 2013 6 May 2013 6

• SQL - using COUNT query

  I have a database like this structure:

  Table - lodges

  LodgeID (PK)

  Lodge

  etc.

  Table - scores

  ScoreID (PK)

  Score

  CategoryID

  LodgeID (FK)

  I try to return the results in the form:

  LodgeID, Lodge, category, number of Scores in this category, the average Score in this category

  Thus, for example, if I had:

  Lodges

  LodgeID Lodge

  1, lodge a

  2, two lodge

  scores

  ScoreID, Score, CategoryID, LodgeID

  1, 3, 101, 1

  2, 5, 101, 1

  3, 7, 101, 1

  4, 10, 102, 2

  2, 5, 20, 102

  2, 6, 30, 102

  7, 40, 102, 2

  I will return:

  1, box 1, 3, 5

  2, Lodge 2, 4, 25

  I tried things like:

  SELECT COUNT (ScoreID) as scoreCount, AVG (Score) as Averagescore, Lodge OF scores_temp INNER JOIN lodges_temp ON scores_temp. LodgeID = lodges_temp. LodgeID

  Without success. Pointers would be much appreciated.

  Ignore that - just need to add a GROUP BY clause.

• query SQL - COUNT (1)

  Hi all
  Under request, could someone explain COUNT (1) means?
  

  INSERT INTO edr_class_by_speed_report_data
    (
      site_id,
      site_lane_id,
      interval_start_date_time,
      vehicle_class,
      vehicle_speed,
      vehicle_count
    )
    SELECT site_id,
           site_lane_id,
           interval_start_date_time,
           vehicle_class,
           speed,
           COUNT(1)
    FROM (
           SELECT site_id,
                  site_lane_id,
                  (SELECT MAX(interval_start_date_time)
                   FROM edr_rpt_tmp_grouping_table
                   WHERE interval_start_date_time <= date_time) interval_start_date_time,
                  vehicle_class,
                  NVL( (SELECT MAX (min_speed)
                              FROM edr_rpt_tmp_speed_ranges
                              WHERE min_speed <= ROUND(vehicle_speed)
                             ),
                             0 )  speed
          FROM    edr_class_by_speed_veh_data
          WHERE edr_class_by_speed_veh_data.vehicle_error_count  = 0
         )
      GROUP BY site_id,
               site_lane_id,
               interval_start_date_time,
               vehicle_class,
               speed;

  Thanks in advance.

  It stands for count (*). See this AskTom discussion thread: [select Count (1) how it works | http://asktom.oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:1156151916789]

• SQL query help needed in the Clause type

  Hello

  I'm currently learning Clause type. How can I write in the clause type to get the result below:

  I have a table like this

  DEPTNO ENAME

  -------           ------

  20 SMITH

  CELINE 10

  BOND 20

  ALLEN 30

  WARD 30

  20 JONES

  30 MARTIN

  30 BLAKE

  10 CLARK

  SCOTT 20

  10 KING

  30 TURNER

  20 ADAMS

  30 JAMES

  20 FORD

  10 MILLER

  I want the output should look like this

  DEPTNO ENAME

  ------     -----

  CELINE 10, CLARK, KING, MILLER

  20 JONES, ADAMS, BOND, FORD, SCOTT, SMITH

  30 MARTIN, JAMES BLAKE, WARD, TURNER, ALLEN

  Hear is the script I am currently working on.

  with emp_group as

  (

  Select 20 deptno, ename 'SMITH' Union double all the

  choose 10, 'CÉLINE' from dual union all

  Select 20, "BOND" of all the double union

  Select 30, 'ALLEN' from dual union all

  Select 30, 'WARD' of all the double union

  Select 20, "JONES' from dual union all

  Select 30, 'MARTIN' from dual union all

  Select 30, "BLAKE" from dual union all

  choose 10, 'CLARK' from dual union all

  Select 20, 'SCOTT' from dual union all

  choose 10, 'KING' of the dual union all

  Select 30, 'TURNER' from dual union all

  Select 20, 'ADAMS' from dual union all

  Select 30, 'JAMES' of the dual union all

  Select 20, 'FORD' Union double all the

  choose 10, 'MILLER' from dual

  )

  Select

  DEPTNO

  A1

  of emp_group

  model

  ignore the nav

  partition (deptno)

  dimension (ROW_NUMBER() over (PARTITION BY deptno ORDER BY ename DESC) rn)

  measures (ename, LPAD(' ', 100) A1)

  rules)

  A1 [rn > 0] = ename [cv ()],

  A1 [0] = ename [cv ()]

  )

  order by deptno

  ;

  your help is very appreciated.

  Thank you in advance.

  Try this.

  Select

  *

  Of

  (

  with emp_group as

  (

  Select 20 deptno, ename 'SMITH' Union double all the

  choose 10, 'CÉLINE' from dual union all

  Select 20, "BOND" of all the double union

  Select 30, 'ALLEN' from dual union all

  Select 30, 'WARD' of all the double union

  Select 20, "JONES' from dual union all

  Select 30, 'MARTIN' from dual union all

  Select 30, "BLAKE" from dual union all

  choose 10, 'CLARK' from dual union all

  Select 20, 'SCOTT' from dual union all

  choose 10, 'KING' of the dual union all

  Select 30, 'TURNER' from dual union all

  Select 20, 'ADAMS' from dual union all

  Select 30, 'JAMES' of the dual union all

  Select 20, 'FORD' Union double all the

  choose 10, 'MILLER' from dual

  )

  Select

  DEPTNO

  names

  rn

  of emp_group

  model

  ignore the nav

  partition (deptno)

  dimension of)

  ROW_NUMBER() over (PARTITION BY deptno ORDER BY ename) rn

  )

  measures (ename, cast (null as names of varchar2 (40)))

  rules

  (

  names [any] order by desc = ename [cv ()] rn | «, » || names [cv () + 1]

  )

  order by deptno

  )

  where rn = 1

  Best regards, Andrei

• SQL Count helps

  Hello world
  
  I need to display the SPER_STATUS_TEXT count as 0 if there is no data from query below. Could someone help me please
  
  SQL > SELECT a.sper_status_text, COUNT (*)
  2 from (SELECT sper.assettxt,
  CASE 3
  4. WHEN sper.sper_status_text = "assessment" said.
  5 THEN
  6 'confirmed assessment '.
  7. WHEN sper.sper_status_text AS "update - rated %".
  8 THEN
  9 "update - rated up to."
  10. WHEN sper.sper_status_text AS "update - % evaluated.
  11. CAN
  12 'update - rated down"
  13 ELSE
  14 "other responses.
  15 END
  16 sper_status_text
  17 zzcus.zzcus_sper_data sper
  18 WHERE sper.sper_dates = ' 20100801-20100831'
  19 AND sper.customer_id = 'NATFINS. '
  20 AND sper.task_inquiry_type = "Vendor Comparison"
  21 AND sper.assettxt <>'! MAD
  (22) a
  23 GROUP BY a.sper_status_text
  ORDER 24 (CASE
  25. WHEN a.sper_status_text = "Said assessment" THEN 1
  26. WHEN a.sper_status_text = "update - evaluated until ' THEN 2
  27. WHEN a.sper_status_text = 'Update - rated down' THEN 3
  28 4 SOMETHING ELSE
  END 29);
  
  Results:
  SPER_STATUS_TEXT COUNT (*)
  ------------------------ ----------
  Claims assessment 2
  
  I need to display as below (if there no data I need to display the number as 0)
  SPER_STATUS_TEXT COUNT (*)
  ------------------------ ----------
  Claims assessment 2
  Updated - evaluated up to 0
  Updated - rated low 0
  Other answers 0
  
  Please advice

  You can get this. Using the TYPE clause.

  SQL>
  SQL> CREATE TABLE ZZCUS_SPER_DATA1
    2  (
    3     SPER_STATUS_TEXT VARCHAR2 (30)
    4    ,TASK_INQUIRY_TYPE VARCHAR2 (100)
    5  );
  
  Table created.
  
  SQL>
  SQL> INSERT INTO ZZCUS_SPER_DATA1
    2       VALUES (
    3                 'Data Updated', 'Descriptive Data Challenge - Maturity date / Redemption date');
  
  1 row created.
  
  SQL>
  SQL> INSERT INTO ZZCUS_SPER_DATA1
    2       VALUES ('Data Updated', 'Descriptive Data Challenge - Ticker / Local Code');
  
  1 row created.
  
  SQL>
  SQL> SELECT *
    2    FROM (  SELECT A.SPER_STATUS_TEXT, COUNT (*) CNT
    3              FROM (SELECT CASE
    4                              WHEN SPER.SPER_STATUS_TEXT = 'Data Confirmed'
    5                              THEN
    6                                 'Data Item Confirmed'
    7                              WHEN SPER.SPER_STATUS_TEXT LIKE 'Data Updated'
    8                              THEN
    9                                 'Data Item Updated'
   10                              ELSE
   11                                 'Other Responses'
   12                           END
   13                              SPER_STATUS_TEXT
   14                      FROM ZZCUS_SPER_DATA1 SPER
   15                     WHERE 1 = 1
   16                           AND SPER.TASK_INQUIRY_TYPE LIKE 'Descriptive Data Challenge%') A
   17          GROUP BY A.SPER_STATUS_TEXT
   18          ORDER BY (CASE
   19                       WHEN A.SPER_STATUS_TEXT = 'Data Item Confirmed' THEN 1
   20                       WHEN A.SPER_STATUS_TEXT = 'Data Item Updated' THEN 2
   21                       WHEN A.SPER_STATUS_TEXT = 'Other Responses' THEN 3
   22                       ELSE 4
   23                    END))
   24  MODEL
   25     DIMENSION BY (SPER_STATUS_TEXT)
   26     MEASURES (CNT)
   27     RULES
   28        (CNT ['Data Item Confirmed'] = NVL (CNT[CV ()], 0),
   29        CNT ['Data Item Updated'] = NVL (CNT[CV ()], 0),
   30        CNT ['Other Responses'] = NVL (CNT[CV ()], 0));
  SPER_STATUS_TEXT           CNT
  ------------------- ----------
  Data Item Updated            2
  Other Responses              0
  Data Item Confirmed          0
  
  3 rows selected.
  
  SQL> 
  

  G.

• SQL count (*) with Group of

  Hello
  
  I need help to fix this SQL.
  
  Fields in the table are like that.
  

  ID(PK)
  user_id
  user_name
  login_time(timestamp)

  Basically I want the values of user_id, user_name, last time the logged-in user and total number of times the user
  

  select  distinct user_id , user_name, login_date from USER_LOGIN
  where login_date in (select max(login_date) from USER_LOGIN group by user_id) 

  the above query is to give the result set with user_id, user_name, last time that the user logged on, but how can I include count (*) Group of user_id in the sql above
  

  select  distinct user_id , user_name, login_date, count(*) from USER_LOGIN
  where login_date in (select max(login_date) from USER_LOGIN group by user_id)  group by user_id 

  the sql above does not work.
  
  can you help me to get the number of records by user_id group.
  
  Thank you
  SK

  Hello

  Looks like you want something like this:

  SELECT       user_id
  ,       user_name
  ,       MAX (login_time)     AS last_login_time
  ,       COUNT (*)          AS total_rows
  FROM       user_login
  GROUP BY  user_id
  ,            user_name
  ;
  

  This assumes that user_login is off standard (like him are often seen), such that every row of the same user_id will also have the same user_name.

  I hope that this answers your question.
  If not, post a small example of data (CREATE TABLE and INSERT statements) and the results desired from these data.

• GROUP OF + SQL COUNT + SUM

  Hello
  
  I have a table, it has 2 colunms, (name, number)
  
  name number
  B1 7
  B1 7
  B1 28
  B1 28
  B1 28
  B2 7
  B2 28
  B3 7
  . .
  . .
  .
  .
  
  
  I want to see below
  
  number
  name sum 7sum 28sum
  
  5 2 3 B1
  2 1 1 B2
  B3...
  .
  .
  .
  .
  .
  
  
  Can you help me
  
  THANK YOU VERY MUCH FOR HELP

  Like this?

  SQL> ed
  Wrote file afiedt.buf
  
    1  with t as (select 'B1' as name, 7 as num from dual union all
    2             select 'B1', 7 from dual union all
    3             select 'B1', 28 from dual union all
    4             select 'B1', 28 from dual union all
    5             select 'B1', 28 from dual union all
    6             select 'B2', 7 from dual union all
    7             select 'B2', 28 from dual union all
    8             select 'B3', 7 from dual)
    9  --
   10  -- end of test data - use query below
   11  --
   12  select name
   13        ,count(*)
   14        ,sum(decode(num,7,1,0)) as sum7
   15        ,sum(decode(num,28,1,0)) as sum28
   16  from t
   17  group by name
   18* order by 1
  SQL> /
  
  NA   COUNT(*)       SUM7      SUM28
  -- ---------- ---------- ----------
  B1          5          2          3
  B2          2          1          1
  B3          1          1          0
  

• Query that needed help

  Hello
  I need help to form a query. I have two tables Support_issues and Support_comments with the information below.
  I want to create a query to view the account of the situation for the last 15 days until today.
  

  Sample Input data
  
  support_issues: 
  ISSUE_ID  ISSUE_DESC  CREATION_DATE  STATUS
  1          AAA        01/NOV/2011    Open
  2          BBB        02/NOV/2011    Closed
  3          CCC        02/NOV/2011    Open
  4          DDD        03/NOV/2011    Reopened
  5          EEE        03/NOV/2011    Reopened
  
  support_comments:
  COMMENT_ID  ISSUE_ID  COMMENT_DESC  STATUS  UPDATE_TIME
  101          1        aaa           Open    01/NOV/2011
  102          2        bbb           Open    02/NOV/2011
  103          2        bbbbbb        Closed  03/NOV/2011
  104          2        bbbb11        Reopened 03/NOV/2011
  105          3        ccc           Open     02/NOV/2011
  106          2        bbbbb         Closed   03/NOV/2011
  107          4        ddddd         Open     03/Nov/2011
  108          5        eeeee         Open     03/NOV/2011
  109          4        343434        Closed   06/NOV/2011
  110          4        dfdf          Reopened 07/NOV/2011
  111          5        dfdfdf        Closed   08/NOV/2011
  112          5        udehjk        Reopened 10/NOV/2011

  Sample output:
  
  DATE         Created   Reopened   Closed
  28/OCT/2011  0         0          0
  29/OCT/2011  0         0          0
  30/OCT/2011  0         0          0
  31/OCT/2011  0         0          0
  01/NOV/2011  1         0          0
  02/NOV/2011  2         0          0
  03/NOV/2011  2         1          2
  04/NOV/2011  0         0          0
  05/NOV/2011  0         0          0
  06/NOV/2011  0         0          1
  07/NOV/2011  0         1          0
  08/NOV/2011  0         0          1
  09/NOV/2011  0         0          0
  10/NOV/2011  0         1          0
  11/NOV/2011  0         0          0

  For "Created" count of status must be taken Support_issues table, for others it must be taken from table Support_comments.
  
  Please help me to form a query for this!
  
  Thank you
  Mukesh

  Hello

  Try the following query

  with t1 as
  (
  select to_char(sysdate-level+1,'dd-mm-yyyy') as date_range from dual where level<16 connect by sysdate-16
  

  Cannot test because I did not create, insert commands...

• Problem with PL/SQL insert query

  Hello to all the genius... Vikram im, Im new in the world of the apex and pl/sql... I need everything that you guys help... This is my first application user (for example)
  
  name of the table - form
  name of the column - f_no number, name varchar2, number of salary.
  Apex page n - p1_f_no, p1_name, p1_sal
  
  Now my problem is the query that is below works in the workshop of sql (insertion of data in the table in shape) and can be seen using the select query... but when I implement this in the apex... It shows - in all areas:
  
  declare
  v_no number (3);
  v_Name varchar2 (20);
  v_sal number (10);
  Start
  Insert in the form values (: v_no,: v_name,: v_sal);
  end;
  
  IM using this query in the Process button,
  
  Thank you
  
  -Best regards,.
  Vikram

  Mahir M. Quluzade have already responded.

  Published by: Gokhan Atil on 03.May.2011 12:45

• Assistance needed with Custom Transaction

  Hello

  I don't know if this is possible or not, but I would be very grateful for any help anyone can offer.

  I wish to have a couple of drop down fields in form following a table after you select a choice from the drop-down list fields, it uses the data selected in the fields in the form to run a query that will empty the existing table and insert new records.  Although I intend to do it on more than one field, I just try on a unique fields for the moment.

  I use a Cusatom Transaction, because I believe that this will allow me to enter SQL which will perform more than one task.  My understanding of this is correct?

  The following code attempts to remove all existing records in the table, then insert new records.  However, an error pops up when I click the button to insert the record.  It seems that the SQL do not remove and insert consecutively in the same custom transaction.

  Is this possible, and if so, can anyone advise me how to do this.  My current SQL code as part of the operation is: -.

  REMOVE TempAspirationalRole.* FROM TempAspirationalRole;

  INSERT INTO TempAspirationalRole
  SELECT TblRoles.RoleProfile_ID, TblRoles.RoleName, TblCourses.CourseName, TblRoleCourses.Requirement
  OF (TblRoles INNER JOIN TblRoleCourses ON TblRoles.RoleProfile_ID = TblRoleCourses.RoleProfile_ID) INNER JOIN TblCourses ON TblRoleCourses.CourseRef = TblCourses.CourseRef
  WHERE (((TblRoles.RoleProfile_ID) = {AspirationalRoleID}));

  The above will work properly in MySQL if I replace the {AspirationalRoleID} for a real record doesn't.

  Thanks for your time,

  Gary

  At the end of the day, but start with something simple...

  http://www.php.NET/function.MySQL-query

  start deleting Ceccaldi
  function My_Delete(&$tNG) {}

  Get the current values of the form
  $threadid = $tNG-> getColumnValue ('NbForumMessageID');

  $query = "DELETE FROM messagesubscribe WHERE the threadID = '". $threadid. » » » ;

  $result = mysql_query ($query);
  If (! $result) {}
  $message = "invalid query: '." mysql_error(). « \n\n » ;
  $message. = "query string: '." $query;
  $message = nl2br ($message);
  Die ($message);
  }

  Repeat as needed for other mysql queries

  }
  end My_trigger

• sql Update query after matching with the string

  I am trying to reach the query that updates a table column with the value of the other table, after that he finds an exact match.
  
  So here's the table data and sample to create.
  

  create table code1 
  (
      codeid number,
      codedesc varchar2(60)
  );
  
  Insert into code1 values ( 1,'R1 CONTRACTS');
  
  Insert into code1 values ( 2,'R2 CONTRACTS');
  
  Insert into code1 values ( 3,'R3 CONTRACTS');
  
  Insert into code1 values ( 4,'R5 CONTRACTS');
  
  Insert into code1 values ( 5,'R9 CONTRACTS');
  
  Insert into code1 values ( 6,'R10 CONTRACTS');
  
  create table table1 
  (   
      tablekey number,
      prefix  varchar2(25),
      codedesc    varchar2(60)
  );
  
  Insert into table1(tablekey,prefix) values (1,'1001PAC');
  
  Insert into table1(tablekey,prefix) values (2,'1001MXT');
  
  Insert into table1(tablekey,prefix) values (3,'1002PAE');
  
  Insert into table1(tablekey,prefix) values (4,'1003PCS');
  
  Insert into table1(tablekey,prefix) values (5,'1004BDX');
  
  Insert into table1(tablekey,prefix) values (6,'1005PAC');
  
  Insert into table1(tablekey,prefix) values (7,'1006PAC');
  
  Insert into table1(tablekey,prefix) values (8,'1007LDR');
  
  Insert into table1(tablekey,prefix) values (9,'1009LCR');
  
  Insert into table1(tablekey,prefix) values (10,'1010LBR');
  
  Insert into table1(tablekey,prefix) values (11,'ABCDEF');

  I'm writing a query that would update the value of column - codedesc (currently Null) of the table1 table: after it is a string of column - table code1 codedesc.
  
  The logic for the match is, - take - 2nd column of table-codedesc code value and get 2 characters. For example, when the string is - R1 CONTRACTS, the string will be 1. (Select substr ("R1 CONTRACTS, 2, 2) of the double). -Output will be 1.
  
  Now,.
  Look in table 1 for the 3rd position of the prefix that corresponds to the string returned by the query above. So, if the prefix is '1001PAC', it should look for 2 value of figures from the 3rd position. So, in this case it will be 01. Digitally 01 and 1 are equal, then the match is found for this line in the table1 table, so we will need to update the value of the column codedesc with the "contracts of R1.
  

      tablekey,    prefix            codedesc    
  ---------- ------------------------------------------------------------
  
        1               1001PAC     R1 CONTRACTS    -- Needs to be update with this value. 
        2               1001MXT     R1 CONTRACTS
        3               1002PAE      R2 CONTRACTS
  ...
        11             ABCDEF                                --Null ( No Need to update when no match found).

  SQL> select * from v$version;
  
  BANNER
  ----------------------------------------------------------------
  Oracle Database 10g Release 10.2.0.4.0 - 64bit Production
  PL/SQL Release 10.2.0.4.0 - Production
  CORE    10.2.0.4.0      Production
  TNS for Linux: Version 10.2.0.4.0 - Production
  NLSRTL Version 10.2.0.4.0 - Production

  Appreciate your help.

  Hello

  You want to avoid TO_NUMBER, given that will cause an error if even a line has a number no (except space) in the wrong place.
  Use RTRIM to remove extra spaces at the end of the match_key and LPAD to add '0', if necessary, at the beginning:

  MERGE INTO     table1          dst
  USING   (
            SELECT  LPAD ( RTRIM ( SUBSTR ( codedesc
                                   , 2
                                 , 2
                                 )
                            )
                       , 2
                       , '0'
                       )          AS match_key
            ,     codedesc
            FROM     code1
       )               src
  ON     (src.match_key     = SUBSTR ( dst.prefix
                         , 3
                       , 2
                       )
       )
  WHEN MATCHED THEN UPDATE
       SET     dst.codedesc     = src.codedesc
  ;
  

  Thanks for posting the CREATE TABLE and INSERT statements; It's very useful!