SQL Server contains the NEWID() function. This function creates a unique value of type uniqueidentifier. We can use this function in several ways to generate unique numbers to suit our requirements : NEWID() generate alphanumeric value of 36 char. ...
In the grid, click Columns and then click the ellipses (…) to the right of the property. Rename the constraint Type a new name in the Name box. Make sure that your new name does not duplicate a name in the Selected Primary/Unique Key or Index list. Set the clustered option In the...
A primary key must use unique values. If the primary key consists of more than one column, the combination of values in these columns must be unique across the whole table. Since the key is meant to identify every row uniquely, it can’t appear more than once. A primary key must not ...
UNIQUE constraint's key must be unique. So, any combinations of columns that also include the PRIMARY KEY constraint's columns arede factounique, too. Since we need an index on RequiredDate and OrderID–in order to get index coverage for the inner part of the subquery–adding a UNIQUE con...
offers developers and database administrators a flexible programming environment. They can set up rules governing the relationships between different data fields, such as one to one, one to many, unique, required, or optional, and add “pointers” among different tables. The system enforces these...
DECLARE @Random NVARCHAR(10);--To store 4 digit random number DECLARE @Final NVARCHAR(MAX)--Final unique random number DECLARE @Upper INT; DECLARE @Lower INT This will create a random number between 1 and 9999 SET @Lower = 1 The lowest random number ...
I have many tables with existing 'unique clustered' indexes. I would like to be able to add the 'primary key' attribute without dropping/recreating the clustered index. Is this poss...
SQL Server One of the great mysteries in security management is the modus operandi of criminal hackers. If you don't know how they can attack you, how can you protect yourself from them? Prepare to be enlightened. This article is not intended to show you how to hack something, but rather...
Setup operations for SQL Server failover clustering have changed in this release. To install or upgrade a SQL Server failover cluster, you must run the Setup program on each node of the failover cluster. To add a node to an existing SQL Server failover cluster, you must run SQL Server ...
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