sys.system_columns (Transact-SQL)


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

Contains a row for each column of system objects that have columns.

Column nameData typeDescription
object_idintID of the object to which this column belongs.
namesysnameName of the column. Is unique within the object.
column_idintID of the column. Is unique within the object.

Column IDs might not be sequential.
system_type_idtinyintID of the system-type of the column
user_type_idintID of the type of the column as defined by the user.

To return the name of the type, join to the sys.types catalog view on this column.
max_lengthsmallintMaximum length (in bytes) of column.

-1 = Column data type is varchar(max), nvarchar(max), varbinary(max), or xml.

For text columns, the max_length value will be 16 or the value set by sp_tableoption 'text in row'.
precisiontinyintPrecision of the column if numeric-based; otherwise, 0.
scaletinyintScale of the column if numeric-based; otherwise, 0.
collation_namesysnameName of the collation of the column if character-based; otherwise, NULL.
is_nullablebit1 = Column is nullable.
is_ansi_paddedbit1 = Column uses ANSI_PADDING ON behavior if character, binary, or variant.

0 = Column is not character, binary, or variant.
is_rowguidcolbit1 = Column is a declared ROWGUIDCOL.
is_identitybit1 = Column has identity values.
is_computedbit1 = Column is a computed column.
is_filestreambit1 = Column is declared to use filestream storage.
is_replicatedbit1 = Column is replicated.
is_non_sql_subscribedbit1 = Column has a non-SQL Server subscriber.
is_merge_publishedbit1 = Column is merge-published.
is_dts_replicatedbit1 = Column is replicated by using SSIS.
is_xml_documentbit1 = Content is a complete XML document.

0 = Content is a document fragment, or the column data type is not xml.
xml_collection_idintNon-zero if the column data type is xml and the XML is typed. The value will be the ID of the collection containing the validating XML schema namespace of the column.

0 = No XML schema collection.
default_object_idintID of the default object, regardless of whether it is a stand-alone sys.sp_bindefault, or an inline, column-level DEFAULT constraint. The parent_object_id column of an inline column-level default object is a reference back to the table itself. Or, 0 if there is no default.
rule_object_idintID of the stand-alone rule bound to the column by using sys.sp_bindrule.

0 = No stand-alone rule.

For column-level CHECK constraints, see sys.check_constraints (Transact-SQL).
is_sparsebit1 = Column is a sparse column. For more information, see Use Sparse Columns.
is_column_setbit1 = Column is a column set. For more information, see Use Column Sets.
generated_always_typetinyintThe numeric value representing the type of column:



generated_always_type_descnvarchar(60)The text description of the type of column:




 Applies to: SQL Server 2016 through SQL Server 2016.

The visibility of the metadata in catalog views is limited to securables that a user either owns or on which the user has been granted some permission. For more information, see Metadata Visibility Configuration.

Object Catalog Views (Transact-SQL)
Catalog Views (Transact-SQL)
Querying the SQL Server System Catalog FAQ
sys.columns (Transact-SQL)
sys.all_columns (Transact-SQL)
sys.computed_columns (Transact-SQL)

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