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The following excerpt from the listing for running the script inCh04NoBit1Nulls.sql shows the rows that succeeded in entering table T. Notice that there are just two rows, although there are four INSERT statements (see the INSERT statements from the preceding sample). Each row of output includes a known value (0 or 1) for a bit data type in the bit1 column. The two omitted rows correspond to INSERT statements that did not specify a value for the bit1 column. This result confirms the impact of the NOT NULL constraint for the bit1 column in the preceding CREATE TABLE listing. int1 ----------1 NULL bit1 ----0 1 varchar1 -------NULL NULL dec1 ---NULL 9.75 cmp1 ---1 NULL

You can use the DEFAULT keyword in a column declaration to designate a default value for the column. If an INSERT statement or an UPDATE statement fails to specify a value for the column, then SSE assigns the DEFAULT value, instead of a null value, to the column in a new row. Using a DEFAULT column property assignment makes sense when a null value has no meaning for a column, such as a column to designate whether a contract is signed and available for review. You can represent this type of column with a bit data type that is either 0 for not signed or not available, but 1 for signed and available. A null value makes no sense for this type of column (unless you assume it is possible to not know if a contract is signed and available for review). A DEFAULT constraint can specify A constant, such as a constant value equal to a number or a sequence of characters A function s return value, such as the GETDATE() function to return the current date and time A SQL-92 niladic function, which can supply either the current user s name or the current date and time NULL, which is not necessary because data column values are null by default You specify a column s default value by following the DEFAULT keyword in the column s declaration with a constant, built-in function, a niladic function, or another keyword (NULL). The SQL-92 niladic CURRENT_TIMESTAMP function and the built-in GETDATE() function both return the current date and time. Four different SQL-92 niladic functions return the user account name for the current user: CURRENT_USER, SESSION_USER, SYSTEM_USER, and USER.

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The key to understanding PivotTables is to understand which data goes where, and, prior to actually composing the tables, thinking about how to arrange the data that contribute to them. For example, our salesperson workbook could have assigned a different column to each salesperson, but that would greatly complicate the data aggregation tasks at which PivotTables are so adept. Try that approach and you ll see what I mean; you ll have more aggravation than aggregation. Remember that the data you want counted, summed, or averaged go in the Values area. The categories by which the data are broken out go into the Row and/or Column Labels, or Report Filter areas. It s tempting to say that by merely clicking and dragging various source data fields around the pivot report you can experiment and simply see what happens. But it really helps to appreciate how the areas interact with one other the what-goes-where question-and that appreciation will speed the table construction process. It s true nail these concepts down and you can assemble a PivotTable in about four seconds. Ok maybe five. But now that you ve mastered all these sophisticated number-crunching techniques, you still need to know how to bring these results to good old hard copy pages at least once in a while. Next up: Printing in Excel.

You can also specify default values independently of column declarations and bind the default values to columns in one or more tables. This capability will be removed from future versions of SQL Server, including its SSE edition. Therefore, you should use the DEFAULT constraint whenever possible.

The Ch04NullToZero.sql file illustrates how to define a default value for a bit column that represents missing values as zeroes rather than the default of null values. The CREATE TABLE statement from the file shows the syntax for the DEFAULT keyword. There is no need for any parentheses after the DEFAULT keyword to designate the constant value (0).

} public void onSuccess(String[] results) { for (int i=0;i<results.length;i++) lbProjects.addItem(results[i]); } }); lbProjects.addChangeHandler(new ChangeHandler () { public void onChange(ChangeEvent event) { // remove all of the current items in the milestone list for (int i=lbMilestones.getItemCount()-1;i>=0;i--) lbMilestones.removeItem(i); // get all of the milestones for the project dataService.getMilestones(lbProjects.getItemText(lbProjects.getSelect edIndex()), new AsyncCallback<String[]>() { public void onFailure(Throwable caught) { handleError(caught); } public void onSuccess(String[] results) { for (int i=0;i<results.length;i++) lbMilestones.addItem(results[i]); day1.setEnabled(true); day2.setEnabled(true); day3.setEnabled(true); day4.setEnabled(true); day5.setEnabled(true); day6.setEnabled(true); day7.setEnabled(true); } }); } });

Figure 4 25. Subtle difference Note the word Text appearing twice Note the word Text appears here twice vertically, representing the columnar selection. Select a row of cells and you ll see this (Figure 4 26)

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