By Joseph Sack
SQL Server 2008 Transact-SQL Recipes: A Problem-Solution method is an example-based consultant to the Transact-SQL language that's on the center of SQL Server 2008. learn how to create databases, insert and replace information, generate studies, safe your info, and extra. writer Joseph Sack takes universal Transact-SQL projects and breaks them down right into a challenge / answer structure that's speedy and straightforward to learn so you might get the task performed quick whilst the strain is on.
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Additional resources for SQL Server 2008 Transact-SQL Recipes: A Problem-Solution Approach
Specifically, in the context of a WHERE clause, operators can be used to compare two expressions, and also check whether a condition is TRUE, FALSE, or UNKNOWN. ■Note SQL Server 2008 also introduces new assignment operators, which I’ll discuss in Chapter 2. qxd 4/11/08 9:55 AM Page 9 CHAPTER 1 ■ SELECT The next few recipes will demonstrate how the different operators are used within search expressions. 000 (17 row(s) affected) How It Works The exercise demonstrated the BETWEEN operator, which tested whether or not a column’s ShipDate value fell between two dates: WHERE ShipDate BETWEEN '7/28/2002 00:00:00' AND '7/29/2002 23:59:59' Notice that I designated the specific time in hours, minutes, and seconds as well.
In SQL Server 2008, you have the wildcard options described in Table 1-2. Table 1-2. qxd 12 4/11/08 9:55 AM Page 12 CHAPTER 1 ■ SELECT ProductID 3 2 877 316 Name BB Ball Bearing Bearing Ball Bike Wash - Dissolver Blade (4 row(s) affected) What if you want to search for the literal value of the % (percentage sign) or an _ (underscore) in your character column? For this, you can use the ESCAPE operator (first described earlier in Table 1-1). This next query searches for any product name with a literal _ underscore value in it.
FREETEXT Searches character-based data for words using meaning, rather than literal values. IN Provides an inclusive list of values for the search condition. IS NOT NULL Evaluates whether the value is NOT NULL. IS NULL Evaluates whether the value is NULL. LIKE Tests character string for pattern matching. NOT BETWEEN Specifies a range of values NOT to include. Used with the AND clause between the beginning and ending values. NOT IN Provides a list of values for which NOT to return rows. NOT LIKE Tests character string, excluding those with pattern matches.