Question

I need to compare the value of a column (LASTNAME) with a system variable (:VARIABLE), but the variable is an email address, so I need to trim off the “@email.com” and “firstname.” Some things I’ve tried:

select * 
  from TABLENAME 
 where LASTNAME LIKE :VARIABLE

select * 
  from TABLENAME 
 where LASTNAME IN :VARIABLE

I’ve been able to trim off the @email.com, can’t figure out how to trim off FIRSTNAME. at the same time.

Answer 1

Regular expressions can help:

SQL> SELECT LTRIM(regexp_substr('[e-mail]','\.[^@]*'),'.') last_name from dual;

LAST_NAME
---------
lastname

Your query could then look like:

SELECT *
  FROM tablename 
 WHERE UPPER(LTRIM(regexp_substr(:VARIABLE,'\.[^@]*'),'.')) = UPPER(lastname);