SqlServer有多种找到SqlServer主键的方法，下面就为您介绍其中的四种，供您参考学习，其中的第一、二中种方法是最为简单的 。
1:利用SQL自带的存储过程找到SqlServer主键
EXEC sp_pkeys @table_name=表名
2:利用系统表INFORMATION_SCHEMA.KEY_COLUMN_USAGE 找到SqlServer主键
- SELECT TABLE_NAME,COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
- WHERE TABLE_NAME=表名
3: 以下这个查询表结构的语句可能大家都见过：
利用syscolumns,sysindexes,sysindexkeys三个表关联可以查出SqlServer主键
- SELECT
- (case when a.colorder=1 then d.name else end) N表名,
- a.colorder N字段序号,
- a.name N字段名,
- (case when COLUMNPROPERTY( a.id,a.name,IsIdentity)=1 then √else end) N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) N主键,
- b.name N类型,
- a.length N占用字节数,
- COLUMNPROPERTY(a.id,a.name,PRECISION) as N长度,
- isnull(COLUMNPROPERTY(a.id,a.name,Scale),0) as N小数位数,
- (case when a.isnullable=1 then √else end) N允许空,
- isnull(e.text,) N默认值,
- isnull(g.[value],) AS N字段说明
- --into ##tx
-
- 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 object_name(a.id),a.colorder
4:
- select o.name as 表名,c.name as 字段名,k.colid as 字段序号,k.keyno as 索引顺序 from sysindexes i
- join sysindexkeys k on i.id = k.id and i.indid = k.indid
- join sysobjects o on i.id = o.id
- join syscolumns c on i.id=c.id and k.colid = c.colid
- where o.xtype = U
- and exists(select 1 from sysobjects where xtype = PK and name = i.name)
- order by o.name,k.colid
