The first statement of your PL/I program must be a PROCEDURE or a PACKAGE statement. You can add SQL statements to your program wherever executable statements can appear. Each SQL statement must begin with EXEC (or EXECUTE) SQL and end with a semicolon (;).
For example, an UPDATE statement might be coded as follows:
exec sql update Department
export Mgrno = :Mgr_Num
where Deptno = :Int_Dept;