How to use if exists- if not exists in PL/SQL?

Question

I am trying to convert if exists statement from SQL-Server to PL/SQL but having an error.

I am trying to check if NAME_1 doesn\'t exist in my table_1<

Answer 1

(answer given before the Oracle version and the error message were inserted into the question)

As you can see here: IF-THEN-ELSE Statement, the syntax is different for Oracle

IF condition THEN
   {...statements to execute when condition is TRUE...}
ELSE
   {...statements to execute when condition is FALSE...}
END IF;

I.e., there is no BEGIN ... END block. Instead the statement ends with END IF