SQLServer, Oracle get database, table, field in table, type, comment

SQLServer:
[sql] view plain copy
-- get all non-system databases 
select name from master..sysdatabases where name not in('master', 'model', 'msdb', 'tempdb', 'northwind', 'pubs' , 'ReportServer', 'ReportServerTempDB') 
 
-- get the detailed field information of a table 
select c.name,t.name,c.prec,p.value from syscolumns c 
inner join systypes t on c.xtype= t.xtype 
inner join sysobjects o on c.id= o.id 
inner join sys.extended_properties p on c.id = p.major_id and c.colid = p.minor_id 
where o.xtype='u'and t.status=0 and o .name='table name' 
 
 
-- get all table information 
select * from sysobjects where XType='U' 
 
-- field information, associated table id=syscolumns.  id
select * from syscolumns  
 
-- comment information, associated field information major_id=syscolumns.id 
select * from sys.extended_properties 
 
-- primary key auto-increment information, associated id = syscolumns.id 
select * from sysindexkeys  
select * from sysindexes  
 
 
-- table details (field name, type, length, whether it is a primary key, whether it is an identifier, allowing null , comment) 
select a.name N'field name', b.name N'type',  
COLUMNPROPERTY(a.id,a.name,'PRECISION') as N'length',  
(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 'PK' else '' end) N'primary key',  
(case when COLUMNPROPERTY( a.id ,a.name,'IsIdentity'   )=1 then 'identity'else '' end) N'identity',
(case when a.isnullable=1 then 'true'else 'false' end) N'允许空',  
isnull(g.[value],'') AS N'注释'  
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  
where d.name='表名' 
order by a.colorder  -- the table information of the current user is stored in the two views respectively  SELECT * FROM user_tab_columns    -- get all the columns, column information  SELECT * FROM user_tables  -- get all the tables of the current user  [sql] view plain copy






oracle:



 


 
 

--user_tab_columns: Details of the columns in the table, but there is no identification of whether it is the primary key 
--user_cons_columns: Constraint view. 
SELECT utc.COLUMN_NAME as column name, ucc.COLUMN_NAME AS primary key, utc.DATA_TYPE as column type, utc.DATA_LENGTH as type length, utc.NULLABLE as nullable or not FROM user_tab_columns utc  
left join user_cons_columns ucc on utc.TABLE_NAME = ucc. TABLE_NAME   
where POSITION=1 AND ucc.TABLE_NAME = 'your table name'  
ORDER by utc.COLUMN_ID 
 
--user_col_comments:comments