Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide

SQL compatibility and migration considerations

The workstation compilers tolerate the following statement:

 ' EXEC SQL CONNECT :userid IDENTIFIED BY :passwd'

The preceding statement is translated by the PL/I SQL preprocessor and sent to the database precompiler services as:

 ' EXEC SQL CONNECT'

The allows VM SQL/DS users to compile their programs without making significant changes.

Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide