ALTER DATABASE SCOPED CREDENTIAL (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
Changes the properties of a database scoped credential.
Transact-SQL syntax conventions
Syntax
ALTER DATABASE SCOPED CREDENTIAL credential_name WITH IDENTITY = 'identity_name'
[ , SECRET = 'secret' ]
Arguments
credential_name
Specifies the name of the database scoped credential that is being altered.
IDENTITY ='identity_name'
Specifies the name of the account to be used when connecting outside the server. To import a file from Azure Blob storage, the identity name must be SHARED ACCESS SIGNATURE. For more information about shared access signatures, see Using Shared Access Signatures (SAS).
SECRET ='secret'
Specifies the secret required for outgoing authentication. secret is required to import a file from Azure Blob storage. secret may be optional for other purposes.
Warning
The SAS key value might begin with a '?' (question mark). When you use the SAS key, you must remove the leading '?'. Otherwise your efforts might be blocked.
Remarks
When a database scoped credential is changed, the values of both identity_name and secret are reset. If the optional SECRET argument is not specified, the value of the stored secret will be set to NULL.
The secret is encrypted by using the service master key. If the service master key is regenerated, the secret is reencrypted by using the new service master key.
Information about database scoped credentials is visible in the sys.database_scoped_credentials catalog view.
When granting permissions for a shared access signatures (SAS) for use with a PolyBase external table, select both Container and Object as allowed resource types. If not granted, you may receive error 16535 or 16561 when attempting to access the external table.
Permissions
Requires ALTER permission on the credential.
Examples
A. Change the password of a database scoped credential
The following example changes the secret stored in a database scoped credential called Saddles. The database scoped credential contains the Windows login RettigB and its password. The new password is added to the database scoped credential using the SECRET clause.
ALTER DATABASE SCOPED CREDENTIAL AppCred WITH IDENTITY = 'RettigB',
SECRET = 'sdrlk8$40-dksli87nNN8';
GO
B. Remove the password from a credential
The following example removes the password from a database scoped credential named Frames. The database scoped credential contains Windows login Aboulrus8 and a password. After the statement is executed, the database scoped credential will have a NULL password because the SECRET option is not specified.
ALTER DATABASE SCOPED CREDENTIAL Frames WITH IDENTITY = 'Aboulrus8';
GO