updating columns by using variables substitiution dataform

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• Updated column by using a previous record value

  I have data in a table as follows:
  
  sequence ID
  1 100
  2 101
  102 3
  4 103
  4 104
  5 105
  6 106
  
  
  I need increment the value of the sequence of + 10 sequence of the previous record.
  Even if the first value of record sequence will start at only 1.
  i.e.
  sequence ID
  1 100
  10 of 101
  20 102
  30 of 103
  40 104
  50 of 105
  60 106
  
  Is it possible in a single query.

  Hello
  DDL and DML:

  CREATE TABLE test(col1 NUMBER, col2 NUMBER) 
  
  INSERT INTO test SELECT 100 col1, 1 col2 FROM DUAL UNION
  SELECT 101, 2 FROM DUAL UNION
  SELECT 102, 3 FROM DUAL UNION
  SELECT 103, 4 FROM DUAL UNION
  SELECT 104, 5 FROM DUAL UNION
  SELECT 105, 6 FROM DUAL UNION
  SELECT 106, 7 FROM DUAL
  

  The query:

  UPDATE test a SET col2=NVL((SELECT col2*10 FROM test b WHERE a.col2-1=b.col2),1)
  7 Rows Updated.
  
  SELECT * FROM test
  COL1 COL2
  100 1
  101 10
  102 20
  103 30
  104 40
  105 50
  106 60 
  

  Kind regards
  Lakshmi.

• Select the column by using Session variables

  I set a session variable to contain the name of a bound column that is the user. Is it possible to use a session variable to select a column in a database table? If so, how? Does need a statement where clause?
  
  Something like that? :
  
  < cfquery name = "rsSelectColumn" datasource = 'Test' >
  SELECT column 1, column 2, column 3 is Variable from Session
  OF tbl_data
  < / cfquery >
  
  Thank you
  Dave

  I think you want to do this, if the value in the session variable is the actual column name:

  
  SELECT column 1, column 2, #Session Variable # AS Col3
  OF tbl_data
  

  in this way, you can call any column stored in the session variable, and it will still be usable from the QUERY as COL3 regardless of which column you used.

  If that's what you want to do - it OF as simple as that.

  :-)

  Sometimes we have to think of things too.

• Update of column DB using a calculation

  No guy to see for a long time
  IM back again APEX and I just cant knew how to do this.
  
  I have a form with all 50 elements from a DB table
  The loading of the page, I do a complex SQL data manipulation and possibly lead to a code to two digits that appears as a page at the bottom of the page element.
  
  I need to be able to save this value in the database of the form.
  Because it is a SQL querey it cannot be a DB column
  
  I thought I was doing a text element hidden source is the DB column and using the page item as the default source, but that dident work.
  
  Any ideas?

  You can do a process whith a hint of the element of page as updated statement

  Update db_table
  point Set =: P (n) _ page_item
  where... =: _Id P (n)

  Try to run this process in an onload before or after the process of the page

  GR
  Hugo

• You will need to insert update column with the username?

  Hi all
  
  I'm new to this forum of the apex. New to apex as well.
  
  My question is do we have a form and a single column is editable by the user. whenever an update to this column, I need to write their name in the update column.
  
  I heard that we can do with trigger using the variable app_user. But in our project, they made authentication ldap for this form and when an employee login with their company login id they can see only this form of apex. no other option.
  
  In the same form, they were able to show the user name. I checked how they did it. they used * & user * variable for this. , It makes sense for you gentlemen?
  
  all I have to do is insert this & user in the column value.
  
  How to do this. I'm started working in the apex for the past four days alone. willing to bare with me if im a very stupid question.
  
  Thank you
  knani
  
  PS: I know that what im asking is the user name for the Web page the user name of the apex.
  
  Published by: kart on May 26, 2010 11:45

  Hello

  You can use: APP_USER substitution string.
  If you like to use that in the syntax of database trigger is v('APP_USER') for example

  :NEW.CHANGED_BY := NVL(v('APP_USER'), user);
  

  BR, Jari

• Another chart update rate issue (using a state machine)

  Hi all!

  I'm develiping a pilot for a new instrument.  I have the basics of work based on the vi tree tutorial.  Now, I'm creating a basic example.  I started by watching a tutorial of State machine (a soda dispenser).  I have 3 States, basically init/reading data/check buttons & writing. Everything works great, reading and display of data. I would now like to add a chart for one of the data (SAP in this case).  Try to implement the method using the loop counter.  Loop cycles at 100 ms for now updating in 5 seconds (later must be user input).

  So basically, I have a simple state machine that updates the values on the screen in a certain State.  I need these data at the top level for trace or possibly turning most of these (less graphic) in a self-contained vi.

  Anyway, I have a Boolean LED in the main loop that flashes every 5 seconds. So far so good.  Except that the graph updates apparently at random?  Put the prog in sleep mode and I have seen the updated table when the data has been read (inside the red box). He has every time.  I'm just creating a local variable inside the red zone...  I see sporadic updates in the charts, maybe 5-10 updates every 5 seconds.  What Miss me?  If I change the iterations of the loop to a faster number (e.g. 10 ms) graph updates like crazy (although the CASE is false).

  

  Hi Steven8R,

  The chart will update any update a fact local variable refers to the table.  If the chart should be updated each time the code in red box runs.

  The code you have in the structure of the business is not doing anything.  It's just whatever data, the graph contains the reading and writing in itself.

  Something you might try to do instead is wiring the output of the amp VI get directly to the table AMPS inside the 5 second delay of the case structure.  This will update the chart as the most recent data point every 5 seconds.  Is that what you want?

  Best,

• Updated column by max - not where it is null

  Hi all
  
  I have the following table and the date with I want to update the column containing NULL values
  different date, these data are the maxmium number in the same column.
  

  create table test (id number(9), name number(9));
  
  insert into test values(1,2);
  insert into test values(2,2);
  insert into test values(3,2);
  insert into test values(4,2);
  insert into test values(5,2);
  insert into test values(6,null);
  insert into test values(7,null);
  insert into test values(7,null);

  I used this but this update columns with same value. So, it's not what I want
  

  update test set name=(select max(name)+1) from test) where name is null;

  I want the result like this

  id     name
  1       2
  2       2
  3       2
  4       2
  5       2
  6       3
  7       4
  7       5

  Note: the Id column may double
  Thanks in advance
  
  Published by: Isabelle November 23, 2012 23:51

  SQL> select  *
    2    from  test
    3  /
  
          ID       NAME
  ---------- ----------
           1          2
           2          2
           3          2
           4          2
           5          2
           6
           7
           7
  
  8 rows selected.
  
  SQL> update  test t1
    2     set  name = (
    3                  select  name
    4                    from  (
    5                           select  rowid rid,
    6                                   max(name) over() + row_number() over(order by name nulls first,id,rowid) name
    7                             from  test
    8                          ) t2
    9                    where t2.rid = t1.rowid
   10                 )
   11    where name is null
   12  /
  
  3 rows updated.
  
  SQL> select  *
    2    from  test
    3  /
  
          ID       NAME
  ---------- ----------
           1          2
           2          2
           3          2
           4          2
           5          2
           6          3
           7          4
           7          5
  
  8 rows selected.
  
  SQL> 
  

  SY.

• Update the query using nulls update box

  I need to update a column according to the conditions that I've used below, the update query, I used is updated as well to null values. How can I stop this and keep the old values when no match was found for the case.
  

  create table sample (name varchar2(10),eno number(10),salary number(10));
  insert into sample (name,eno,salary) values ('emp1',1,100);
  insert into sample (name,eno,salary) values ('emp2',2,200);
  insert into sample (name,eno,salary) values ('emp3',3,300);
  select * from sample;
      
  update sample 
  set salary = 
  case when salary = 100 then 10000 else 
  case when salary = 150 then 15000 else 
  case when salary = 200 then 20000 end end end
  where name is not null;
         
  Actual o/p:
         emp1     1     10000
         emp2     2     20000
         emp3     3     
  
  Required o/p:
          emp1     1     10000
         emp2     2     20000
         emp3     3      300

  Hello

  The updated control WHERE clause lines.
  If you do not have a WHERE clause, then updates all rows in the table.

  update  sample
  set      salary = case
                        when salary = 100 then 10000
                 when salary = 150 then 15000
                 when salary = 200 then 20000
             end
  where   salary   IN (100, 150, 200)
  ;
  

  Note that you do not need to nest BOX icies expressions (or almost anywhere else). If the 'salary = 100' condition is true, then its correspondent WHEN the value is returned, and the remaining terms will not be evaluated. If the first condition is not true, then only will be the "salary = 150" condition to be evaluated. (The terms are mutually exclusive in this example anyway, so it does not matter.)

  Published by: Frank Kulash, June 5, 2012 13:09

• issue update a table using a function in pipeline

  BANNER
  Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
  PL/SQL Release 10.2.0.4.0 - Production
  CORE     10.2.0.4.0     Production
  TNS for HPUX: Version 10.2.0.4.0 - Production
  NLSRTL Version 10.2.0.4.0 - Production

  OK, I have an example simplified below what is happening
  I try to make updates or inserts in the tables and I use a function pipeline for this bed of the same tables of the to do.
  and it gives me
  

  ORA-04091: table DSAMSTRC.T is mutating, trigger/function may not see it
  ORA-06512: at "DSAMSTRC.GET_T_ARRAY", line 6

  My solution was to do a slider and update record row by row, but I was wondering if there is a way around this error?
  
  
  Here's my example
  

  DROP TABLE t;
  ------------------------------------------------------------------------------------
  
  CREATE TABLE t
  AS
         SELECT LEVEL id, 'A' txt
           FROM DUAL
     CONNECT BY LEVEL <= 10;
  
  -------------------------------------------------------------------------------------
  
  CREATE OR REPLACE TYPE t_table_type AS OBJECT
                    (id NUMBER, txt VARCHAR2 (200));
  ------------------------------------------------------------------------------------
  
  CREATE OR REPLACE TYPE t_array AS TABLE OF t_table_type;
  -----------------------------------------------------------------------------------
  
  CREATE OR REPLACE FUNCTION get_t_array (v_txt IN t.txt%TYPE)
     RETURN t_array
     PIPELINED
  IS
  BEGIN
     FOR EACH IN (SELECT id, txt
                    FROM t
                   WHERE t.txt = v_txt)
     LOOP
        PIPE ROW (t_table_type (EACH.id, EACH.txt));
     END LOOP;
  
     RETURN;
  END;
  ---------------------------------------------------------------------------------------
  
  UPDATE t
     SET txt = 'B'
   WHERE id IN (SELECT id FROM TABLE (get_t_array ('A')));
   

  You can create a global temporary table that has the same columns that use your function to insert in there, and then use it to update t.

  CREATE GLOBAL TEMPORARY TABLE t_temp
  (id    INTEGER,
   txt  VARCHAR2(100))
  ON COMMIT DELETE ROWS;
  
  INSERT INTO t_temp
    (SELECT id, txt FROM get_t_array('A'));
  
  UPDATE t
     SET t.txt = (SELECT txt FROM t_temp
                   WHERE t_temp.id = t.id)
   WHERE t.id IN (SELECT id FROM t_temp);
  

• Cannot use variables

  Hello:
  
  I have a simple question that I can't solve everything. I can run a simple query:
  
  $sql = "SELECT name, ARTIST OF nationality where nationality = 'USA" ";
  
  but when I tried to use a variable as:
  
  $n = "USA";
  $sql = "SELECT name, ARTIST OF nationality where nationality = $n;
  
  The query runs, but does not work. I can't use variables for insert or update. Any help is appreciated!

  Try to put the variable in single quotes:
  $sql = "SELECT name, ARTIST OF nationality where nationality ="$n "";

• I want to update the verson using celluler data how is possible

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