Using SQL Server Management StudioTo create a unique index by using the Table DesignerIn Object Explorer, expand the database that contains the table on which you want to create a unique index. Expand the Tables folder. Right-click the table on which you want to create a unique index and ...
For example, assume that a column that is named "column1" is included in the clustered or unique index. When the column value is changed from a larger to a smaller value (such as changing the value from 20 to 16), the change tracking side table receives the insert operat...
A uniqueifier (or uniquifier as reported by SQL Server internal tools) is a 4-byte value used to make each key unique in a clustered index that allow duplicate key values. This uniqueness is required because each clustering key must point to exactly one record, without the uniqueifier a ...
You can create a unique constraint in SQL Server by using SQL Server Management Studio or Transact-SQL to ensure no duplicate values are entered in specific columns that don't participate in a primary key. Creating a unique constraint automatically creates a corresponding unique index. ...
To create a unique index on a table, using: SQL Server Management Studio Transact-SQL Before You Begin Benefits of a Unique Index Multicolumn unique indexes guarantee that each combination of values in the index key is unique. For example, if a unique index is created on a combination of ...
In addition, both SQL Server 7.0 and 2000 give us the sp_indexoption system stored procedure that allows us to specify locking options on indexes. SQL7 allows us to inspect and set "AllowRowLocks" and "AllowPageLocks," and SQL 2000 gives us the additional options "DisAllowRowLocks" and ...
In the ASP.NET SQL Server implementation, the likelihood of having a collision is very low/approaching zero. The one drawback that I've learned is that having a clustered index on a guid doesn't scale to large volume databases. I'm largely in the integer-as-PK camp. They're small,...
Represents the unique or primary key constraint. This class translates 80 syntax into 90 syntax, this should be reflected in the AST, if a differentiator is to be written.C# Kopieren [System.Serializable] public class UniqueConstraintDefinition : Microsoft.SqlServer.TransactSql.ScriptDom....
You can create a unique constraint in SQL Server by using SQL Server Management Studio or Transact-SQL to ensure no duplicate values are entered in specific columns that don't participate in a primary key. Creating a unique constraint automatically creates a corresponding unique index. ...
Just recently, the following question came up in the microsoft.public.sqlserver.server newsgroup: Can someone tell me the difference between a "unique index" and a "unique constraint"? The SQL Server documentation says that a unique constraint automatically creates a unique index to preserve the ...