SQL Server 批量查 数据库所有表的主键

SELECT a.name AS '表',
  e.name AS '主键字段'
 
FROM sysobjects AS a          --对象表，结合a.xtype='U'条件，查用户表
 LEFT JOIN sysobjects AS b --对象表，结合b.xtype='PK'条件，查主键约束
  ON a.id=b.parent_obj
 LEFT JOIN sysindexes AS c --索引表，根据（主键）约束名称匹配，查对应字段索引
  ON a.id=c.id AND b.name=c.name
 LEFT JOIN sysindexkeys AS d --索引中对应键、列的表，根据索引匹配，查字段id
  ON a.id=d.id AND c.indid=d.indid
 LEFT JOIN syscolumns AS e --字段表，根据字段id匹配，查字段名称
  ON a.id=e.id AND d.colid=e.colid
WHERE a.xtype='U'
  AND b.xtype='PK'