Applies to: SQL Server Azure SQL Database Azure SQL Managed InstanceThis topic describes how to create a unique index on a table in SQL Server by using SQL Server Management Studio or Transact-SQL. A unique index guarantees that the index key contains no duplicate values and therefore every ...
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 oper...
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 ...
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 ...
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 ...
1 Sign in to vote Dear Experts, Sorry I am unable to find TSQL forum,Might be i have posted in wrong window. Please help me to convert the below oracle unique index constraint to SQL server. CREATE UNIQUE INDEX UK_IDX_TLOG ON TLOG_TB (CASE MSG_TYPE WHEN '200' THEN TXN_AUTH_ID ...
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 SQL Server, you can create a unique index when uniqueness is a characteristic of the data itself, but the combination of indexed columns is not the same as the table's primary key . For example, if you plan to query frequently on the Social Security number (ssn) column in theemployee...
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 ...
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 ...