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sql_variant columns cannot be part of a computed column. Developers must use functions for converting datatypes when assigning values from sql_variant objects to objects of other datatypes. The comparison of sql_variant objects has complex rules and is prone to errors. sql_variant values are automatically converted to nvarchar(4000)when accessed from client applications using OLE DB Provider for SQL Server 7.0 or the SQL Server ODBC Driver from SQL Server version 7.0. If stored values are longer then 4,000 characters, SQL Server will return just the first 4,000 characters. sql_variant values are automatically converted to varchar(255) when accessed from client applications using the SQL Server ODBC Driver from SQL Server version 6.5 or earlier, or using DB-Library. If stored values are longer then 255 characters, SQL Server will return just the first 255 characters. sql_variant columns are not supported in the Like predicate. sql_variant columns do not support full-text indexes. sql_variant objects cannot be concatenated using the + operator, even if the stored values are strings or numeric. The proper solution is to convert values before concatenation. Some functions (AVG, IDENTITY, ISNUMERIC, POWER, RADIANS, ROUND, SIGN, STDEV[P], SUM, VAR[P]) do not support sql_variant parameters.

TIP: You should be very conservative in using the sql_variant datatype. Its use has serious performance and design implications.

4:

This is a special kind of datatype that can contain references to cursors. You will see later in this chapter that cursors are programming constructs that are designed to allow operations on records one at a time. It is not possible to define a column of this type. It can be used only for variables and stored procedure output values.

The table datatype is used to store a recordset for later processing. In some ways, this datatype is similar to a temporary table. It was introduced in SQL Server 2000. You cannot use this type to define a column. It can only be used as a local variable to return the value of a function.

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Unfortunately, if you do not have Visual Studio .NET, it is not easy enough to manage the code of individual database objects with only the tools built into SQL Server and Visual SourceSafe. The process involves two steps:

NOTE: You will find more information about table variables later in this chapter, and information about functions in s 5 and 9.

In some cases, developers can use different identifiers to refer to a datatype. For example, the char datatype can be referenced as character and varchar as character varying. Some of these synonyms are based on ANSI SQL-92 standard requirements.

The traverse begins at the root page, progresses to intermediate index levels, and finally moves to bottom-level pages, called leaf pages The index is used to find the correct leaf page On a qualified retrieval or delete, the correct leaf page is the lowest page of the tree at which one or more rows with the specified key or keys reside SQL Server supports both clustered and nonclustered indexes In a nonclustered index, shown in Figure 2-3, the leaf level of the tree (the leaf page of the index) contains every key value in the index along with a row locator for each key value The row locator is also called a bookmark and indicates where to find the referenced data A row locator can have one of two forms If the base table has no clustered index, the table is referred to as a heap.

NOTE: Appendix A contains a table with a list of datatypes and their descriptions, ranges, sizes, and sample constants.

The user can define custom datatypes in the database. These new types are based on system-defined datatypes and are accessible only

in the database in which they are defined. You can define them from the user interface or using a stored procedure as illustrated here:

Exec sp_addtype Phone, varchar(20), 'NOT NULL' Exec sp_addtype typPostalCode, varchar(7), 'NULL' -- in Canada

Therefore, I ve created a tool that loops through database objects and scripts them into separate files TbDbScript. It s written in VBScript and you can download it from www.TrigonBlue.com/sqlxml/sqlxml_download.htm. To run it, you must use Windows Script Host and cscript.exe. Execute from the command prompt:

The first parameter is the name of the new datatype, the second one is the system-defined datatype that it represents, and the third one defines null-ability of the datatype. When the command is executed, the server will add the type to the systype table of the current database. New types can be based on any system-defined type except timestamp.

TIP: A fascinating aspect of user-defined datatypes is that you can change them in one step across the database. This feature is very useful during the development stage of a database. During production, tables contain data and it is not possible to run a script and create them all from scratch.

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