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How to create a auto incremented column in Documentdb


How to create a auto incremented column in Documentdb

By : Krywulf
Date : November 18 2020, 11:13 AM
Hope that helps DocumentDB doesn't include auto-increment functionality out of the box.
As Gaurav mentioned in Do we have Identity Column in DocumentDB, the id field is special in that if a value isn't provided by the application - DocumentDB will assign a GUID automatically.
code :


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Getting auto-incremented int and inserting into another column

Getting auto-incremented int and inserting into another column


By : user3077580
Date : March 29 2020, 07:55 AM
it fixes the issue You don't need to stick '.png' to your image at all, your logic implies that each record contains info about image with extension png. Why would you even need another column then to store the image name?
The second part is that you are using a reserved word for your column name. Keyword NAME is reserved, you should always avoid it.
how can i add primary key value which is auto incremented to another column in php?

how can i add primary key value which is auto incremented to another column in php?


By : Benjamin Belot
Date : March 29 2020, 07:55 AM
it fixes the issue If it was MySQL (yes, I know it was more generic) you could use a trigger: MySQL Triggers last_insert_id()
MySQL Update Incremented (Not Auto-Incremented) Column Values

MySQL Update Incremented (Not Auto-Incremented) Column Values


By : Bogdan Grivko
Date : March 29 2020, 07:55 AM
I wish this help you Something like the following might do what you are looking for. It will assign incrementing values to order based on the question_id ordering:
code :
select @ordval := 0;
update thetable set `order` = 
        (select @ordval := @ordval + 1) order by question_id;
Deleating value from auto incremented column

Deleating value from auto incremented column


By : user3528973
Date : March 29 2020, 07:55 AM
Any of those help As one of the options(simple and straightforward one) you can create a view and generate that "auto-incremented column" on the fly - every time you query the view.
Here is an example:
code :
 -- source table, which does not contain that auto incremented
 -- column you are interested in 
create table t1(id, col1) as (
  select 1, 'abc' from dual union all
  select 2, 'abc' from dual union all
  select 3, 'xyz' from dual union all
  select 4, 'xyz' from dual union all
  select 5, 'xyz' from dual union all
  select 6, 'hij' from dual
  );

-- and here is the view
create or replace view t1_v as
  select id
        , col1
        , row_number() over(partition by col1
                                order by id) as auto_inc
   from t1;


select *
  from t1_v;

        ID COL1   AUTO_INC
---------- ---- ----------
         1 abc           1 
         2 abc           2 
         6 hij           1 
         3 xyz           1 
         4 xyz           2 
         5 xyz           3 
-- Update can be issued against base table or 
-- a view, if it's a key-preserved one
update t1  
   set col1 = 'acb'
 where id = 1;

select *
  from t1_v;


        ID COL1   AUTO_INC
---------- ---- ----------
         2 abc           1 
         1 acb           1 
         6 hij           1 
         3 xyz           1 
         4 xyz           2 
         5 xyz           3 
-- You can delete from the base table or 
-- a view, if it's a key-preserved one
delete from t1  
  where id = 4; 

select *
  from t1_v;

        ID COL1   AUTO_INC
---------- ---- ----------
         2 abc           1 
         1 acb           1 
         6 hij           1 
         3 xyz           1 
         5 xyz           2 
Use auto incremented ID in another column

Use auto incremented ID in another column


By : Paul Boddie
Date : March 29 2020, 07:55 AM
seems to work fine I have two columns in my DB table, where the first one is auto incremented ID. In the second one I would like to have that ID mirrored. (I know it sound like design error, but I really need it) , use TRIGGER
code :
DELIMITER |:    # switch delimiter to prevent execution of  ;

CREATE TRIGGER `copy_id2c_name` BEFORE INSERT ON tb_name
FOR EACH ROW BEGIN
SELECT AUTO_INCREMENT INTO @AI FROM information_schema.tables WHERE table_schema = 'db_name' and table_name = 'tb_name';
set NEW.c_name = @AI;
END;

|:   # execute code
DELIMITER ;   // switch back original delimiter
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