Compare columns of same table in sql server

Question

I'm trying to compare the columns of a table and fetch the unmatched rows.Can someone help me to write a query to fetch the rows where Email_ID not in the format of Firstname.Lastname@abc.com in the below scenario.

TABLE

 S.no Firstname Lastname Email_ID 701 Sean Paul Sean.Paul@abc.com 702 Mike Tyson Mike.Samuel@abc.com 703 Richard Bernard Jim.Anderson@abc.com 704 Simon Sharma Rita.sharma@abc.com 

Answer 1

You mean something like:

select -- some columns
from table
where Email_ID <> (FirstName + '.' + Lastname + '@abc.com')

?

There is nothing in SQL to prevent comparing one column with another, and – with a little more syntax – even across rows.

Answer 2

Search for rows where mail address not like Concat( firstname . lastname @)

select * from tablename
where Email_ID NOT LIKE (Firstname + '.' + Lastname + '@%')

Answer 3

SELECT *
FROM YourTable
WHERE CHARINDEX(FirstName + '.' + LastName + '@', Email) = 0