sql語句查詢數(shù)據(jù)庫中的表名/列名/主鍵/自動(dòng)增長值

----查詢數(shù)據(jù)庫中用戶創(chuàng)建的表

----jsj01 為數(shù)據(jù)庫名

select name tablename from jsj01..sysobjects where type='U' and name not in ('dtproperties')

--查詢表里的字段信息

---docs為表名
---- select * from syscolumns where id = object_id('docs')

----查詢數(shù)據(jù)庫中所有類型
----select name,xtype from systypes

----兩表聯(lián)查，顯示表中所有字段和對應(yīng)的數(shù)據(jù)類型

----syscolumns里字段‘xtype' 對應(yīng) systypes里的 ‘xusertype' ,systypes 里的‘name'字段就是字段的數(shù)據(jù)類型
----docs 為表名
select a.name as fieldname,b.name as type from
syscolumns as a
join systypes as b
on a.xtype = b.xusertype
where id=object_id('docs')

----docs為數(shù)據(jù)表名 ： 查詢表字段、類型、說明

select a.name fieldname,b.name type,c.value comment from
syscolumns as a
full join systypes as b
on a.xtype = b.xusertype
full join ::fn_listextendedproperty(NULL, 'user', 'dbo', 'table', 'docs', 'column', default) as c ----這是2000版本，2005把user改為schema
on a.name=c.objname COLLATE Chinese_PRC_CI_AS -----排序規(guī)則（有時(shí)不加也可以，如果兩表的排序規(guī)則不同，則會(huì)報(bào)錯(cuò)）
--join sysproperties c
--on a.id=c.major_id
where id=object_id('docs')

----查詢表里的主鍵，沒有主鍵為空，如果是多個(gè)組合主鍵就有多個(gè)值 pk為主鍵 fk為外鍵
--- jsj01 為數(shù)據(jù)庫名 docs為表名 fk表示外鍵

select column_name as primarykey,* from
[jsj01].INFORMATION_SCHEMA.KEY_COLUMN_USAGE
where Table_name='docs' and constraint_name like 'fk_%'

--select * from sysobjects WHERE OBJECT_NAME(sysobjects.parent_obj)='docs' --and xtype='pk'
--select * from sysconstraints where id = object_id('docs')
--select * from syscolumns where id = object_id('docs')
--select * from sysindexes
--select * from sysindexkeys

----查詢表中自動(dòng)增長的字段，沒有為空，如果有就只有一個(gè)
----docs為表名

SELECT a.name column_name,b.name data_type
FROM syscolumns a,systypes b
WHERE a.id=object_id('docs') and a.xtype = b.xusertype
AND a.autoval is not null


作者 pukuimin1226

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