I'm new at SQL and I have been trying to practice working with Oracle Database.
While working on an activity, I came across one that confounds me -- I am trying to extract specific text from in-between characters. The specific activity that I cannot seem to figure out using these functions is:
For table called Users in the column called Emails, extract only the email domain (that is, the text in-between @ and .), so that full email addresses:
Becomes a new column called Domains with the values:
So far I have only been able to write code that isolates only the username to:
Using this code:
`select rtrim(Emails,substr(Emails,instr(Emails,'@')))from StudentEmails;`
Any help would be extremely appreciated! I've been scratching my head about this for hours! Thank you!!!
SELECT SUBSTR(Emails,
INSTR(Emails, '@') + 1,
INSTR(Emails, '.') - INSTR(Emails, '@') - 1) AS Domains
FROM Users
Caveat:
I assume that emails have as single dot separating the domain name from domain type (e.g. com, net). If you had an email like [email protected], then the above query would return domain as being the domain.
Regular expressions would be another way to go:
select substr(regexp_substr(emails,'@[^.]+'),2) domains from users;