update

Update

![x;y;z;u]

Supported in

K4

update is a special form of ! in K4/qdb which takes 4 arguments. It updates a given table with the help of the given arguments.

• x is the table to be modified.
• y specifies the conditions to select rows.
• z, a dict, selects columns and gives the placeholder names to use in u.
• u, a dict, specifies what should be done to the selected cells.