将值从一列更改为另一列

Question

I have got a table:

ID        | Description
--------------------
1.13.1-3  | .1 Hello
1.13.1-3  | .2 World
1.13.1-3  | .3 Text
4.54.1-4  | sthg (.1) Ble
4.54.1-4  | sthg (.2) Bla
4.54.1-4  | aaaa (.3) Qwer
4.54.1-4  | bbbb (.4) Tyuio

And would like to change ending of ID by taking value from second column to have result like:

ID       | Description
--------------------
1.13.1   | Hello
1.13.2   | World
1.13.3   | Text
4.54.1   | Ble
4.54.2   | Bla
4.54.3   | Qwer
4.54.4   | Tyuio

Is there any quick way to do it in postgresql?

Answer 1

Use regex to manipulate the strings into what you want:

update mytable set
ID = regexp_replace(ID, '\.[^.]*$', '') || substring(Description from '\.[0-9+]'),
Description = regexp_replace(Description, '.*\.[0-9]+\S* ', '')

See SQLFiddle showing this query working with your data.