1:利用SQL自带的存储过程
EXEC sp_pkeys @table_name=@#表名@#
2:利用系统表INFORMATION_SCHEMA.KEY_COLUMN_USAGE
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
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