(PROC) DATABASE CONNECTION 1. Explicit Connection EXEC SQL DECLARE database_name DATABASE; EXEC SQL CONNECT :username IDENTIFIED BY :password AT database_name USING :database_string; . database_name : Precompiler에서의 identifier . database_string : remote node에 접속하는 SQL*Net syntax 1) SQL Operation EXEC SQL AT database_name SELECT ... EXEC SQL AT database_name INS..