Home/ Questions/Q 767411
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-14T18:01:25+00:00

Just doing a site which requires multiple items to be reordered by AJAX. When

  • 0

Just doing a site which requires multiple items to be reordered by AJAX.

When I create a given object in the database, I want to set the position column to the value of the rows’ primary key upon creation.

How would I do this please?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    A citation from MySQL documentation:

    The DEFAULT clause specifies a default value for a column. With one exception, the default value must be a constant; it cannot be a function or an expression. This means, for example, that you cannot set the default for a date column to be the value of a function such as NOW() or CURRENT_DATE. The exception is that you can specify CURRENT_TIMESTAMP as the default for a TIMESTAMP column. See Section 10.3.1.1, “TIMESTAMP Properties”.

    You can though obtain the id value on selection instead:

    SELECT id, COALESCE(position, id) as position ...
    • 0