查询数据库的表

1、查询数据库中的表，其中，XTYPE为U是数据库表，是P为存储过程，V为视图等。

SELECT * FROM SysObjects Where XType='U' AND name LIKE 'Task%' ORDER BY Name;

 

2、查询数据表的列

SELECT a.name,b.name 

FROM SysObjects a

LEFT OUTER JOIN syscolumns b ON a.id=b.id

Where a.XType='U' AND a.name = 'TaskLine'

 

3、查询表结构信息

 SELECT (case when a.colorder=1 then d.name else null end) 表名,  

 a.colorder 字段序号,a.name 字段名,

 (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 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) 主键,b.name 类型,a.length 占用字节数,  

 COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,  

 isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,(case when a.isnullable=1 then '√'else '' end) 允许空,  

 isnull(e.text,'') 默认值,isnull(g.[value], ' ') AS [说明]

 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 sys.extended_properties g on a.id=g.major_id AND a.colid=g.minor_id

 left join sys.extended_properties f on d.id=f.class and f.minor_id=0

 where b.name is not null

 --WHERE d.name='要查询的表' --如果只查询指定表,加上此条件

 

 order by a.id,a.colorder

 

4、查询表的结构信息

select a.name 表名,b.name 字段名,c.name 字段类型,c.length 字段长度 from sysobjects a,syscolumns b,systypes c where a.id=b.id

and a.name='CLY_UploadRecord' and a.xtype='U'

and b.xtype=c.xtype