xtype字段包含的值的意思如下:
AF = Aggregate function (CLR) 聚合函数(CLR)
C = CHECK constraint CHECK约束
D = Default or DEFAULT constraint 默认或DEFAULT约束
F = FOREIGN KEY constraint 外键约束
L = Log 日志
FN = Scalar function 标量函数
FS = Assembly (CLR) scalar-function 组装(CLR)标量函数
FT = Assembly (CLR) table-valued function 程序集(CLR)表值函数
IF = In-lined table-function 内嵌表函数
IT = Internal table 内部表
P = Stored procedure 存储过程
PC = Assembly (CLR) stored-procedure 组装(CLR)存储过程
PK = PRIMARY KEY constraint (type is K) 主键约束(类型是K)
RF = Replication filter stored procedure 制筛选存储过程
S = System table 系统表
SN = Synonym 同义词
SQ = Service queue 服务序列
TA = Assembly (CLR) DML trigger 装配(CLR) DML触发器
TF = Table function 表函数
TR = SQL DML Trigger 触发器
TT = Table type
U = User table用户表
UQ = UNIQUE constraint (type is K) 唯一约束(类型是K)
V = View 视图
X = Extended stored procedure 扩展存储过程