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--All columns for all rows SELECT * FROM T GO --Count all rows SELECT COUNT(*) 'Rows in T' FROM T --Count int1 values (implicitly non-null) SELECT COUNT(int1) 'int1 values in T' FROM T --Count non-null bit1 values SELECT COUNT(*) 'Count of non-null bit1' FROM T WHERE bit1 IS NOT NULL --Count null bit1 values SELECT COUNT(*) 'Count of null bit1' FROM T WHERE bit1 IS NULL --Average of dec1 values SELECT CAST(AVG(dec1) AS dec(5,2)) 'Avg of dec1' FROM T WHERE dec1 IS NOT NULL Running Ch04InsertWithMissingValuessql generates a result listing like the following one The first result set clearly identifies the null column values with the NULL keyword for each row within the T table The second result set returns the count of all the rows in T The third result set shows how many of the rows in T have a non-null int1 value.

You have learned how to use LIKE to find a character match in data. Full-Text Search provides the ability to search for words or phrases within string or binary data columns similar to a web search such as Google or Bing. You can use LIKE for pattern matching only and not for searching binary data. Full-Text Search has support for multiple languages and other features such as synonym searches. Full-Text Search is especially beneficial for documents stored as binary data in the database. Full-Text Search must be installed during the SQL Server setup, and a special full-text index needs to be created on the table. This book doesn t intend to teach you how to set up and manage FullText Search, but it will show you how to write some of the basic queries. For more information about Full-Text Search, see the book Pro Full-Text Search in SQL Server 2008 by Hillary Cotter and Michael Coles (Apress, 2008). The AdventureWorks2008 database ships with three full-text indexes already in place. Table 2-1 lists the columns with full-text indexes included by default in AdventureWorks2008.

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The fourth and fifth result sets display, respectively, the number of non-null and null column values in the bit1 column of T The sixth result set presents the average across the non-null values in the dec1 column int1 ----------1 2 3 NULL Rows in T ----------bit1 ----0 NULL NULL 1 varchar1 -------NULL abc NULL NULL dec1 --------------------------------------NULL NULL 525 975 cmp1 ----------1 NULL NULL NULL.

As part of displaying the first data table, you declared two strings:

4 int1 values in T ---------------3 Warning: Null value is eliminated by an aggregate or other SET operation. Count of non-null bit1 ---------------------2 Count of null bit1 -----------------2 Avg of dec1 ----------7.50

' Set display filter Dim fl As String = "country = 'Germany'" ' ' Set sort Dim srt As String = "companyname asc"

As the preceding sample demonstrates, null values are permitted by default for columns with int, bit, varchar, and dec data types The same default behavior applies to most other data types that do not have special settings to force the population of a column value The timestamp data type is one exception that requires no special settings to avoid the possibility of a null value Some database applications require a known value for a column For example, you may require users to say whether they smoke or not on a questionnaire for health insurance Failing to answer the question can make it impossible to compute a life insurance rate estimate In this kind of situation, you need a way to constrain the values within a column so that null values are not permitted.

CONTAINS is one of the functions used to search full-text indexes. You will learn more about functions in 3. The simplest way to use CONTAINS is to search a column for a particular word or phrase. Here is the syntax for CONTAINS: SELECT <column1>,<column2> FROM <schema>.<tablename> WHERE CONTAINS(<indexed column>,<searchterm>); Listing 2-19 shows how to use CONTAINS. Notice that the second query has a regular predicate in the WHERE clause as well. Be sure to type in and execute the code to learn how to use CONTAINS. Listing 2-19. Using CONTAINS USE AdventureWorks2008; GO --1 SELECT FileName FROM Production.Document WHERE Contains(Document,'important'); --2 SELECT FileName FROM Production.Document WHERE Contains(Document,' "service guidelines " ') AND DocumentLevel = 2;

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