SAS Certification Prep Guide: Advanced Programming for SAS 9 by SAS Publishing

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The HAVING clause uses the summary function AVG to specify that only the groups that have an average salary that is greater than 40,000 will be displayed in the output. payrollmaster group by jobcode having avg(salary)>40000 order by jobcode; Note: You can learn more about the use of the HAVING clause in Chapter 2, “Performing Advanced Queries Using PROC SQL,” on page 25. 4 Performing Queries Using PROC SQL 4 Text Summary 19 Summary This section contains the following: 3 3 3 3 a text summary of the material taught in this chapter syntax for statements and options sample programs points to remember.

Column-n>>; where SELECT specifies the column(s) that will appear in the output FROM specifies the table(s) or view(s) to be queried WHERE uses an expression to subset or restrict the data based on one or more condition(s) GROUP BY classifies the data into groups based on the specified column(s) HAVING uses an expression to subset or restrict groups of data based on a group condition ORDER BY sorts the rows that the query returns by the value(s) of the specified column(s). Note: The clauses in a PROC SQL SELECT statement must be specified in the order shown.

4 The following chart shows how the number of columns specified as arguments affects the way that PROC SQL calculates a summary function. If a summary function... Then the calculation is... marchflights; Example Groups and Summary Function Processing Summary functions perform calculations on groups of data. When PROC SQL processes a summary function, it looks for a GROUP BY clause: If a GROUP BY clause... Then PROC SQL... payrollmaster group by jobcode; If a query contains a GROUP BY clause, all columns in the SELECT clause that do not contain a summary function should be listed in the GROUP BY clause or unexpected results might be returned.

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