sysobjects, sysolumns, systypes in SQL Server

1, sysobjects

The System Object table. Objects that hold the current database, such as constraints, default values, logs, rules, stored procedures, and so on

In most cases, the two columns that are most useful to you are sysobjects.name and Sysobjects.xtype. The previous one lists the names of the objects to be examined, and the latter defines the type of the object.

Column Name	Data Type	Description
Name	sysname	The name of the object.
Id	Int	The object identification number.
Xtype	CHAR (2)	The object type. Can be one of the following object types: C = CHECK Constraint D = defaults or DEFAULT constraints F = FOREIGN KEY constraint L = Log FN = Scalar function IF = Inline Table function P = Stored Procedure PK = PRIMARY KEY constraint (type is K) RF = copy Filter stored procedure S = System table TF = Table function TR = Trigger U = User Table UQ = UNIQUE constraint (type is K) V = view X = Extended Stored Procedure
Uid	smallint	The user ID of the owner object.
Info	smallint	Keep. Internal use only.
Status	Int	Keep. Internal use only.
Base_schema_ Ver	Int	Keep. Internal use only.
Replinfo	Int	Keep. For replication use.
Parent_obj	Int	The object identification number of the parent object (for example, for a trigger or constraint, which is the table ID).
Crdate	Datetime	The date the object was created.
Ftcatid	smallint	Full-text catalog identifier for all user tables registered for full-text indexing, or 0 for all user tables that are not registered.
Schema_ver	Int	The version number, which is incremented each time the schema of the table changes.
Stats_schema_ Ver	Int	Keep. Internal use only.
Type	CHAR (2)	The object type. Can be one of the following values: C = CHECK Constraint D = defaults or DEFAULT constraints F = FOREIGN KEY constraint FN = Scalar function IF = Inline Table function K = PRIMARY KEY or UNIQUE constraint L = Log P = Stored Procedure R = Rule RF = copy Filter stored procedure S = System table TF = Table function TR = Trigger U = User Table V = view X = Extended Stored Procedure
Userstat	smallint	Keep.
Sysstat	smallint	Internal state information.
Indexdel	smallint	Keep.
Refdate	Datetime	reserved for later use.
Version	Int	reserved for later use.
Deltrig	Int	Keep.
Instrig	Int	Keep.
Updtrig	Int	Keep.
Seltrig	Int	Keep.
Category	Int	Used for publishing, constraints, and identification.
Cache	smallint	Keep.

2, Sysolumns

All fields in the current database are kept inside.
Important Field Explanations:
Syscolumns (
Name sysname,--field name
ID int,--The ID of the table to which the field belongs
Xtype TinyInt,--the field type, associated systypes table
Length smallint,--the field is physically stored
...
)

3. sysobjects and syscolumns in SQL

View all table names:

Select name from sysobjects where type= ' U '

All field names for the query table:

Select name from syscolumns Where id=object_id (' Table name ')

int object_id (' objectname ');

This method returns the database object identification number.

Where the parameter objectname represents the object to be used, whose data type is nchar or char (if char, the system converts it to nchar)

The return type is int, which represents the number of the object in the system.

Like what:

Use Wf_timesheet
Select object_id (' usp_check_excess_hours ')

SELECT * FROM dbo.sysobjects WHERE id = object_id (N ' [dbo].[ Company_rel] ')

(N ' ' represents the Unicode type. Can support different language object names)

The SQL SERVER database system table Systypes stores the field types

Sysobjects, sysolumns, systypes

in SQL Server