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Before you can start creating tables, you must understand the different data types that can be used to define the domains of columns in tables, that is, what data can be entered into the column. There are two different kinds of data types in SQL Server:
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SQL Server system data types User-defined types (UDTs) or SQL Common Language Runtime (SQLCLR) types
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You start by reviewing the available system data types and then look at the possibility of simplifying the use of data types using UDTs. UDTs are implemented using SQLCLR, which is covered in 7, Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream. The available system data types are typically split into several groups, including exact numeric, approximate numeric, character, date and time, and binary.
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There are quite a few string data types in SQL Server; char, varchar, nchar, nvarchar, text, and ntext. The text and ntext types are both deprecated, so avoid using them. They have been replaced by varchar(max) and nvarchar(max). All the -char types take one parameter, which is the number of characters to support storing. The difference between char and varchar (as well as between nchar and nvarchar) is that char is fixed-length and varchar is variable-length. This means that char always allocates enough storage space to store its entire declared length and that varchar stores only the actual data entered. The advantage of using char over varchar is that updates made to a char column never require moving the row because the data that is entered always fits in the allocated space. Note that this advantage is almost always outweighed by the fact that varchar uses a lot less storage space than char [consider varchar(100) vs. char(100)].
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Lesson 1: Working with Tables and Data Types
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With char and varchar, a collation is used to specify the code page (character set) to use when storing and interpreting the contents of the columns. The collation is also used to decide how to sort and compare the data stored in these columns. There are 2,397 variations of collations available in SQL Server 2008, three of which are Japanese_ CI_AI, Finnish_Swedish_CI_AI, and Latin1_General_CI_AI. The rest can be found by querying the table-valued function fn_helpcollations. The collation Japanese_CI_AI uses the 932 code page to support storing Japanese characters. Both Finnish_Swedish_CI_AI and Latin1_ General_CI_AI use the 1252 code page. The _CI_AI part of the collation name specifies whether the collation is case-insensitive (CI) or case-sensitive (CS), as well as accent-insensitive (AI) or accent-sensitive (AS). It is important to know that what is considered an accent is different in different languages and, thus, in different collations as well. Take the character , for example. In Latin1_General_CI_AI, is considered an accented o, meaning that o = would return True; on the other hand, in Finnish_ Swedish_CI_AI, is considered a separate character and o = would return False. Finally, what about nchar and nvarchar Both of these data types store characters using the Unicode universal code page (UCS-2). This means that if you use nchar or nvarchar, you can store any type of character regardless of the collation you choose because two bytes are always used to store each character. Contrast this with varchar and char, which store characters using one or two bytes depending on the collation. Remember that you still need to specify collation because the collation still decides how to sort and compare the data stored in your column. If you want to use a different collation than the one specified on a column when making a comparison, you can specify it in an expression. Here is an example that shows the WHERE clause specifying a collation:
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. . . WHERE Name = ' qvist' COLLATE Finnish_Swedish_CI_AS
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Note that by changing the collation in the expression, SQL Server cannot use an index defined on the column to perform a seek operation because that index is sorted according to another collation.
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