vb.net qr barcode Calculating a subset of rows in Java

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Listing 11-77 Calculating a subset of rows
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try { String query = new String ( " SELECT COUNT(OrderNumber), AVG(Quantity), " FROM Orders o, customers c " + " WHERE oCustomerNumber = cCustNumber"); DataRequest = DatabasecreateStatement(); Results = DataRequestexecuteQuery (query); DisplayResults (Results); DataRequestclose(); }
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SUM(Quantity) " +
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Listing 11-78 The DownRow() method used when calculating a subset of rows
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private void DownRow ( ResultSet DisplayResults ) throws SQLException { long Orders; long Average; long Sum; Orders = DisplayResultsgetLong ( 1 ) ; Average = DisplayResultsgetLong ( 2 ) ; Sum = DisplayResultsgetLong ( 3 ) ; Systemoutprintln("Total Orders = " + Orders); Systemoutprintln("Average Qty = " + Average);
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Systemoutprintln("Total Qty }
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= " + Sum);
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Two common problems that occur when using built-in functions are columns that don t contain a value and rows that contain duplicate values in the same column Many times you don t want empty columns and duplicate rows included in the calculation You can use the DISTINCT modifier to exclude duplicate rows from the calculation Likewise, problems posed by NULL columns can be avoided by using the IS NULL operator along with the NOT operator in a selection expression Both of these are discussed earlier in this chapter
Calculate Without Using Built-in Functions
Although built-in calculation functions are very useful, the DBMS can perform calculations that are defined in the SELECT statement Listing 11-79 illustrates how to do this In this example, the DBMS is directed to return to the program the value of the StoreNumber column and the difference between the value in the Sales column and the value in the Estimate column Neither the Sales column nor the Estimate column data is returned Instead, only the difference between these two columns is returned Any arithmetic expression can be used in the SELECT statement along with the appropriate names of columns that contain data elements used in the calculation This code segment is used with the Model B program, and Listing 11-80 contains the DownRow() method to retrieve and display values from the ResultSet
Listing 11-79 Calculating without built-in functions
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try { String query = new String ( " SELECT StoreNumber, Sales - Estimate " + " FROM Sales "); DataRequest = DatabasecreateStatement(); Results = DataRequestexecuteQuery (query); DisplayResults (Results); DataRequestclose(); }
Listing 11-80 The DownRow() method used when calculating without built-in functions
private void DownRow ( ResultSet DisplayResults ) throws SQLException { String Store; long Difference; Store = DisplayResultsgetString ( 1 ) ; Difference = DisplayResultsgetLong ( 2 ) ;
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Systemoutprintln("Store = " + Store); Systemoutprintln("Difference = " + Difference); }
Grouping and Ordering Data
Columns are returned in the ResultSet in the order that the column names appear in the SELECT statement of the query The order in which rows appear in the ResultSet can be grouped into similar values or sorted in ascending or descending order by using the GROUP BY clause or the ORDER BY clause, which are discussed in the next few sections of this chapter Grouping is the task of organizing rows of data according to similar values within the same column Let s say that you want to see sales for each store The ResultSet can be grouped by store number Sorting is the task of organizing rows of data in either alphabetical or numerical order according to the value of a column in the result set A DBMS is capable of creating simple and complex sorting A simple sort is when the values in a single column are used for the sort A complex sort is when multiple columns are used for the sort, such as sorting rows by last name and within last names, by first names Code segments in the following sections return a ResultSet, therefore the Model B program should be used to execute these code segments Before executing them, create a Sales table as defined below; then insert rows of data contained in Table 11-15 into the Sales table
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