1:利用SQL自帶的存儲過程
EXEC sp_pkeys @table_name='表名'
2:利用系統表INFORMATION_SCHEMA.KEY_COLUMN_USAGE
SELECT TABLE_NAME,COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE TABLE_NAME='表名'
3: 以下這個查詢表結構的語句可能大家都見過：
利用syscolumns,sysindexes,sysindexkeys三個表關聯可以查出主鍵
SELECT
(case when a.colorder=1 then d.name else '' end) N'表名',
a.colorder N'字段序號',
a.name N'字段名',
(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) N'標識',
(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'主鍵',
b.name N'類型',
a.length N'佔用字節數',
COLUMNPROPERTY(a.id,a.name,'PRECISION') as N'長度',
isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as N'小數位數',
(case when a.isnullable=1 then '√'else '' end) N'允許空',
isnull(e.text,'') N'默認值',
isnull(g.[value],'') AS N'字段說明'
--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 字段序號,k.keyno as 索引順序 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