Conditionally display the values in the column based on another column

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  I think I found a solution.

  delimiter //
create table a (
  id int (10) unsigned auto_increment,
  a int(10),
  b int(10),
  update_date datetime NULL,
  update_column varchar(16) NULL,
  primary key (id)
)//

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  set NEW.update_column = NULL;
  -- you need to start with the rightmost column if you want
  -- that matched with the highest priority
  if OLD.b != NEW.b then
   set NEW.update_column = "b";
  elseif OLD.a != NEW.a then
   set NEW.update_column = "a";
  end if;
end //

  TEST

  insert into a (id,a,b) values (1,1,1), (2,1,1), (3,1,1), (4,1,1)[
update a set b = 2 where id = 2;
update a set a = 2 where id = 3;
update a set a = 2 where id = 4;
update a set b = 2 where id = 4;
select * from a;

  DISPLAY

  ID  A   B   UPDATE_DATE                    UPDATE_COLUMN
1   1   1   (null)                          (null)
2   1   2   March, 24 2014 23:22:33+0000      b
3   2   1   March, 24 2014 23:22:33+0000      a
4   2   2   March, 24 2014 23:22:33+0000      b

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  Denes Kubicek
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  Hello

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  11	one	0	1
  22	one	0	2
  33	b	1	3
  44	b	1	4
  55	c	3	5

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  table

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  But my table is bigger and more complex query.

  Any other sugestion?

  Thank you and sorry for my bad English.

  Hello

  Whenever you have a problem, please post a small example data (CREATE TABLE and only relevant columns, INSERT statements) of all the tables involved, so that people who want to help you can recreate the problem and test their ideas.

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  Always say what version of Oracle you are using (for example, 11.2.0.2.0).

  See the FAQ forum: Re: 2. How can I ask a question on the forums?

  This sounds like a job for a Query of Top - N, like this:

  WITH got_r_num AS

  (

  SELECT table_x. *- or whatever the columns that you want to

  , EVALUATE () DURING (ORDER BY sla_team) AS r_num

  FROM table_x

  -WHERE... - If you need any filtering, put it here

  )

  SELECT *- or the list of all columns except r_num

  OF got_r_num

  WHERE r_num<=>

  ORDER BY r_num

  ;

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  update patient_bu a set a.entry_date = (select b.entry_date from CLIENT_MED_DT b where a.id = b.id)

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  ORA-01427: einreihig subquery returns multiple rows
  
  
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  Oh well, I forgot the UPDATE clause:

  SQL> create table patient_bu
    2  (id number
    3  ,entry_date date);
  
  Table created.
  
  SQL> create table client_met_dt
    2  (id number
    3  ,entry_date date);
  
  Table created.
  
  SQL> merge into patient_bu a
    2  using (select id
    3               ,max(entry_date) max_date
    4         from   client_met_dt
    5         group  by id
    6        ) b
    7  on    (a.id = b.id)
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  0 rows merged.
  

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  You must alert gReturn instead of get.
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  http://roelhartman.blogspot.com/