SAS/ACCESS 9.2 for Relational Databases: Reference, Fourth Edition

872 Using a Pass-Through Query in a Subquery 4 Chapter 30When a comparison operator such as < or > is used in a WHERE clause, thesubquery must return a single value. In this example, the AVG summary functionreturns the average salary of employees in the department, $57,840.86. This value isinserted in the query, as if the query were written:where dept like &dept and salary < 57840.86;Employees who earn less than the department’s average salary are listed in thefollowing output.Output 30.3Output from a Pass-Through Query in a SubqueryEmployees Who Earn Below the ’ACC%’ Average SalaryEMPID LASTNAME-----------------123456 VARGAS135673 HEMESLY423286 MIFUNE457232 LOVELLIt might appear to be more direct to omit the Pass-Through query and to insteadaccess Samples.AllEmp a second time in the subquery, as if the query were written asfollows:%let dept=’ACC%’;proc sql stimer;select empid, lastnamefrom samples.allempwhere dept like &dept and salary