Special registers in SQL statements

You can specify certain special registers in SQL statements. A special register, for example, CURRENT DATE, contains information that can be referenced in SQL statements.

For locally run SQL statements, the special registers and their contents are shown in the following table.

Special registers	Contents
CURRENT CLIENT_ACCTNG CLIENT ACCTNG	The accounting string for the client connection.
CURRENT CLIENT_APPLNAME CLIENT APPLNAME	The application name for the client connection.
CURRENT CLIENT_PROGRAMID CLIENT PROGRAMID	The program ID for the client connection.
CURRENT CLIENT_USERID CLIENT USERID	The client user ID for the client connection.
CURRENT CLIENT_WRKSTNNAME CLIENT WRKSTNNAME	The workstation name for the client connection.
CURRENT DATE CURRENT_DATE	The current date.
CURRENT DEBUG MODE	The debug mode to be used when creating or altering routines.
CURRENT DECFLOAT ROUNDING MODE	The rounding mode to be used when working with decimal floating point values.
CURRENT DEGREE	The number of tasks the database manager should run in parallel.
CURRENT IMPLICIT XMLPARSE OPTION	The whitespace handling options to be used for XML data when implicitly parsed without validation.
CURRENT PATH CURRENT_PATH CURRENT FUNCTION PATH	The SQL path used to resolve unqualified data type names, procedure names, and function names in dynamically prepared SQL statements.
CURRENT SCHEMA	The schema name used to qualify unqualified database object references where applicable in dynamically prepared SQL statements.
CURRENT SERVER CURRENT_SERVER	The name of the relational database currently being used.
CURRENT TEMPORAL SYSTEM_TIME	The timestamp to use when querying a system_period temporal table.
CURRENT TIME CURRENT_TIME	The current time.
CURRENT TIMESTAMP CURRENT_TIMESTAMP	The current date and time in timestamp format.
CURRENT TIMEZONE CURRENT_TIMEZONE	A duration of time that links local time to Universal Time Coordinated (UTC) using the formula: `local time - CURRENT TIMEZONE = UTC` It is taken from the system value QUTCOFFSET.
CURRENT USER CURRENT_USER	The primary authorization identifier of the job.
SESSION_USER USER	The runtime authorization identifier (user profile) of the job.
SYSTEM_USER	The authorization identifier (user profile) of the user connected to the database.

If a single statement contains more than one reference to any of CURRENT DATE, CURRENT TIME, or CURRENT TIMESTAMP special registers, or the CURDATE, CURTIME, or NOW scalar functions, all values are based on a single clock reading.

For remotely run SQL statements, the values for special registers are determined at the remote system.

When a query over a distributed table references a special register, the contents of the special register on the system that requests the query are used. For more information about distributed tables, see the DB2® Multisystem topic collection.