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Download Apprendre SQL avec MySQL : avec 40 exercices corrigés by Christian Soutou PDF

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Combining, or rolling up, of rows occurs when 3 the SELECT clause contains only columns that are specified within an aggregate function 3 the WHERE clause, if there is one, contains only columns that are specified in the SELECT clause. COUNTRIES table and displays it in a column called MaxPopulation. Aggregate functions, such as the MAX function, can cause the same calculation to repeat for every row. This occurs whenever PROC SQL remerges data. Remerging occurs whenever any of the following conditions exist 3 The SELECT clause references a column that contains an aggregate function that is not listed in a GROUP BY clause.

You can use aggregate functions in the SELECT or HAVING clauses. Note: See “Grouping Data” on page 45 for information about producing summaries of individual groups of data within a table. 6 Aggregate Functions Function Definition AVG, MEAN mean or average of values COUNT, FREQ, N number of nonmissing values CSS corrected sum of squares CV coefficient of variation (percent) MAX largest value MIN smallest value NMISS number of missing values PRT probability of a greater absolute value of Student’s t RANGE range of values STD standard deviation STDERR standard error of the mean SUM sum of values SUMWGT sum of the WEIGHT variable values1 T Student’s t value for testing the hypothesis that the population mean is zero USS uncorrected sum of squares VAR variance 1 In the SQL procedure, each row has a weight of 1.

Subsequent columns determine the order of rows that have the same value for the primary sort. features order by Type desc, Name; Note: The ASC keyword is optional because the PROC SQL default sort order is ascending. 18 Specifying a Sort Order World Topographical Features Name Type --------------------------Angel Falls Waterfall Niagara Falls Waterfall Tugela Falls Waterfall Yosemite Waterfall Andaman Sea Baltic Sea Bering Sea Black Sea Caribbean Sea Gulf of Mexico Sea Hudson Bay Sea Mediterranean Sea Sorting by Calculated Column You can sort by a calculated column by specifying its alias in the ORDER BY clause.

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