SQL , INGRES : replace by blank after some char

Question

days: char (31)
period : char (31)

days : 1234567891234567891234567891234
period: AAAAAAAAAABBBBBBBBBBCCCCCCCCCCD

I want to replace everything by * after the 20th character

days : 12345678912345678912***********
period:AAAAAAAAAABBBBBBBBBB***********

Any idea?

Answer 1

You could try something like:

select 
  rpad(substr(days,1,20),length(days),'*'),
  rpad(substr(period,1,20),length(period),'*')
from table

Answer 2

In SQL Server :

 DECLARE @TABLE TABLE (DAYS VARCHAR(MAX), PERIOD VARCHAR(MAX))
insert into @table values 
('1234567891234567891234567891234', 'AAAAAAAAAABBBBBBBBBBCCCCCCCCCCD')

SELECT SUBSTRING(DAYS,1,20)+REPLICATE('*',LEN(DAYS)- 20),
SUBSTRING(PERIOD ,1,20)+REPLICATE('*',LEN(PERIOD)- 20) FROM @TABLE