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Unfortunately, this solution does not prevent another developer from using some other tool to change a database object directly in the database. You can even open Server Explorer in Visual Studio .NET to change them without source code control. Visual SourceSafe only works through consensus. Loose cannons can still wreak havoc on your development ship.

The uniqueidentifier datatype stores 16-byte binary values. These values are often called Global Unique Identification numbers (GUID). When a system generates a new GUID value, it is guaranteed that the same value cannot be produced again, neither on the same computer nor on any other computer in the world. GUIDs are generated using the identification number of the network card and a unique number obtained from the computer s clock. Manufacturers of network cards guarantee that the identification number of a network card will not be repeated in the next 100 years. A uniqueidentifier constant is usually presented as

character string {BB7DF450-F119-11CD-8465-00AA00425D90} binary constant 0xaf16a66f7f8b31d3b41d30c04fc96f46

However, you will rarely type such values. In Transact-SQL, GUIDs should be generated using the NEWID function. There is also an API function that can produce a GUID value.

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The sql_variant datatype is based on the same idea as the variant datatype in Visual Basic. It is designed to allow a single variable, column, or parameter to store values in different datatypes. Internally, variant objects record two values:

The actual value The metadata describing the variant: base datatype, maximum size, scale, precision, and collation

4:

To promote the change to another server, you can choose the Run On option in the context menu of the change script.

While the row operations manager works with individual rows, the index manager maintains and supports searches on B-trees, which are used for SQL Server indexes. An index is structured as a tree, with both a root page and intermediate- and lower-level pages (or branches). A B-tree groups records that have similar index keys, thereby allowing fast access to data by searching on a key value. The B-tree s core feature is its ability to balance the index tree. ( B stands for balanced.) Branches of the index tree are spliced together or split apart as necessary so that the search for any given record always traverses the same number of levels and thus requires the same number of page accesses.

The following statement creates a lookup table that can store values of different types:

Before SQL Server 2000, I had to use more than one field to store lookup values of different datatypes. The following statements illustrate how you can insert different types of values in one column:

Insert Lookup (LookupGroupId, LookupId, LookupValue) Values (2, 34, 'VAR') Insert Lookup (LookupGroupId, LookupId, LookupValue) Values (3, 22, 2000) Insert Lookup (LookupGroupId, LookupId, LookupValue) Values (4, 16, '1/12/2000') Insert Lookup (LookupGroupId, LookupId, LookupValue) Values (4, 11, $50000)

A sql_variant object can store values of any datatype except:

But there are more serious restrictions on their use:

When I first started to use Visual SourceSafe, the directions implied by the terms Check Out and Check In sounded inverted to me. Just think of Visual SourceSafe as an actual safe from which you are taking your code and into which you subsequently return your code after you are done with it.

sql_variant columns cannot be part of primary or foreign keys. sql_variant columns can be used in indexes and unique keys as long as their values are shorter than 900 bytes. sql_variant columns cannot have an identity property.

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