sp_pkeys
返回当前环境中单个表的主键信息。语法
sp_pkeys [ @table_name = ] 'name'
[ , [ @table_owner = ] 'owner' ]
[ , [ @table_qualifier = ] 'qualifier' ]
返回当前环境中单个表的主键信息。语法
sp_pkeys [ @table_name = ] 'name'
[ , [ @table_owner = ] 'owner' ]
[ , [ @table_qualifier = ] 'qualifier' ]
sp_pkeys 返回显式定义了 PRIMARY KEY 约束的列的信息。由于不是所有的系统均支持显式命名的主键,因此由网关实现者决定主键的构成。要注意主键这一术语指的是表的逻辑主键。应在被列为逻辑主键的每个键上定义一个唯一索引。此唯一索引也会由 sp_statistics 返回。存储过程 sp_pkeys 与 ODBC 中的 SQLPrimaryKeys 等价。返回的结果按 TABLE_QUALIFIER、TABLE_OWNER、TABLE_NAME 和 KEY_SEQ 排序。
(case when a.colorder=1 then d.name else '' end)表名,
a.colorder 字段序号,
a.name 字段名,
(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,
(case when (SELECT count(*)
FROM sysobjects
WHERE (name in
(SELECT name
FROM sysindexes
WHERE (id = a.id) AND (indid in
(SELECT indid
FROM sysindexkeys
WHERE (id = a.id) AND (colid in
(SELECT colid
FROM syscolumns
WHERE (id = a.id) AND (name = a.name))))))) AND
(xtype = 'PK'))>0 then '√' else '' end) 主键,
b.name 类型,
a.length 占用字节数,
COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,
(case when a.isnullable=1 then '√'else '' end) 允许空,
isnull(e.text,'') 默认值,
isnull(g.[value],'') AS 字段说明 FROM syscolumns a left join systypes b
on a.xtype=b.xusertype
inner join sysobjects d
on a.id=d.id and d.xtype='U' and d.name<>'dtproperties'
left join syscomments e
on a.cdefault=e.id
left join sysproperties g
on a.id=g.id AND a.colid = g.smallid
order by a.id,a.colorder
COLUMNPROPERTY( )函数