What does log on mean in sql

LOG ON in SQL is used to establish a database connection, allowing users to access a specific database using specified credentials (such as username and password). Syntax: LOG ON [AS] {USER NAME | CONNECTION NAME} [WITH PASSWORD | WITHOUT PASSWORD] User credentials can be specified using different parameters, explicitly defining the password or exempting it if not required. The LOG ON statement is used only once before connecting to the database and helps establish a secure connection to the data source.

LOG ON in SQL

In SQL, LOG ON is used to establish a database connection. It allows users to access a specific database using specified credentials such as username and password.

Syntax:

<code>LOG ON [AS] {用户名 | 连接名称} [WITH 密码 | WITHOUT PASSWORD]</code>

Parameters:

• Username or connection name: Specify the user or connection name to establish the connection with.
• WITH Password: Specify the password used to connect.
• WITHOUT PASSWORD: Use this option if a password is not required.

How to use:

To use LOG ON, use it in a SQL query before connecting to the database. For example:

<code>LOG ON AS 'sa' WITH PASSWORD = 'MyPassword'</code>

This will establish a connection to the database using username 'sa' and password 'MyPassword'.

Note:

• The LOG ON statement is only used once before connecting to the database.
• For built-in user credentials, usually use the WITH PASSWORD option.
• For external data sources, you may need to use the connection name and WITHOUT PASSWORD option.
• LOG ON is similar to the CONNECT statement, but LOG ON is used with SQL Server and CONNECT is used with Oracle.

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