在 SQL 中是否可以创建一个以特定字母开头并后跟特定数量数字的串行主键？

Question

I have many lines of existing data which seems to use a unique identifier column that begins with the letter K and is followed by 8 or 9 random numbers. I would like to use this column as the primary key in a table. For all future additions to the table I'd like to automatically generate a unique PK that follows the same format as the existing data. Is there a way to achieve this within SQL code, or would I need to create an elaborate (for my beginner level) Python function that generates the unique PK?

Answer 1

I would leave the existing rows as they are and continue with a different scheme for future rows, for example a plain number without letter (cast to a string). That can be generated with a sequence conveniently, and there is no risk of collisions.

Simplicity over perceived beauty!