sys.systypes (Transact-SQL)

THIS TOPIC APPLIES TO: yesSQL Server (starting with 2008)yesAzure SQL DatabaseyesAzure SQL Data Warehouse yesParallel Data Warehouse

Returns one row for each system-supplied and each user-defined data type defined in the database.

Important

This SQL Server 2000 system table is included as a view for backward compatibility. We recommend that you use the current SQL Server system views instead. To find the equivalent system view or views, see Mapping System Tables to System Views (Transact-SQL). This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.

Column name Data type Description
name sysname Data type name.
xtype tinyint Physical storage type.
status tinyint Identified for informational purposes only. Not supported. Future compatibility is not guaranteed.
xusertype smallint Extended user type. Overflows or returns NULL if the number of data types exceeds 32,767.
length smallint Physical length of the data type.
xprec tinyint Internal precision, as used by the server. Not to be used in queries.
xscale tinyint Internal scale, as used by the server. Not to be used in queries.
tdefault int ID of the stored procedure that contains integrity checks for this data type.
domain int ID of the stored procedure that contains integrity checks for this data type.
uid smallint Schema ID of the owner of the type.

For databases upgraded from an earlier version of SQL Server, the schema ID is equal to the user ID of the owner.

** Important *\* If you use any of the following SQL Server DDL statements, you must use the sys.types catalog view instead of sys.systypes.

ALTER AUTHORIZATION ON TYPE

CREATE TYPE

Overflows or returns NULL if the number of users and roles exceeds 32,767.
reserved smallint Identified for informational purposes only. Not supported. Future compatibility is not guaranteed.
collationid int If character based, collationid is the id of the collation of the current database; otherwise, it is NULL.
usertype smallint User type ID. Overflows or returns NULL if the number of data types exceeds 32,767.
variable bit Variable-length data type.

1 = True

0 = False
allownulls bit Indicates the default nullability for this data type. This default value is overridden by if nullability is specified by using CREATE TABLE or ALTER TABLE.
type tinyint Physical storage data type.
printfmt varchar(255) Identified for informational purposes only. Not supported. Future compatibility is not guaranteed.
prec smallint Level of precision for this data type.

-1 = xml or large value types.
scale tinyint Scale for this data type, based on precision.

NULL = Data type is nonnumeric.
collation sysname If character based, collation is the collation of the current database; otherwise, it is NULL.

See Also

Compatibility Views (Transact-SQL)
Mapping System Tables to System Views (Transact-SQL)