Nóta
Teastaíonn údarú chun rochtain a fháil ar an leathanach seo. Is féidir leat triail a bhaint as shíniú isteach nó eolairí a athrú.
Teastaíonn údarú chun rochtain a fháil ar an leathanach seo. Is féidir leat triail a bhaint as eolairí a athrú.
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
SQL database in Microsoft Fabric
Passwords can be the weakest link in a server security deployment. Take great care when you select a password. A strong password has the following characteristics:
- Is at least eight characters long.
- Combines letters, numbers, and symbol characters within the password.
- Isn't found in a dictionary.
- Isn't the name of a command.
- Isn't the name of a person.
- Isn't the name of a user.
- Isn't the name of a computer.
- Is changed regularly.
- Is different from previous passwords.
SQL Server passwords can contain up to 128 characters, including letters, symbols, and digits. Because logins, user names, roles, and passwords are frequently used in Transact-SQL statements, certain symbols must be enclosed by double quotation marks (") or square brackets ([ and ]). Use these delimiters in Transact-SQL statements when the SQL Server login, user, role, or password has the following characteristics:
- Contains or starts with a space character.
- Starts with the
$or@character.
If used in an OLE DB or ODBC connection string, a login or password containing special characters must be enclosed in braces, and right braces must be escaped. For example, a password my}Pass;word must be specified in the connection string like PWD={my}}Pass;word}.