The current date of the database server
The current date of the database server
The current time of the database server
The current timestamp of the database server
The current time of the database server
The name of the database, or an empty string if not supported by the DBMS
The now of the database server
The numeric constant for pi
rank() over(PARTITION BY colum1, column2, ...
rank() over(PARTITION BY colum1, column2, ... ORDER BY column1, column2 desc, ...)
The name of the database user, or an empty string if not supported by the DBMS