Exist clause in PL/SQL

Hi,
Is there in PL/SQL any replacement for SQL-Server's "If exist/If not exist" clause?
I need to do something like : if not exists (select * from Table1 where Field1=...) Insert into Table1 (Field1, Field2,...) values (..., ...,...)

thanks Received on Mon Nov 12 2001 - 09:41:53 CST