sql生成数据库字典 Oracle sql server

SELECT
               --A.COLUMN_ID AS 字段序号,
               A.TABLE_NAME 表名,TT.comments 表说明,
               A.COLUMN_NAME AS 字段名,
               DECODE(E.UNIQUENESS, 'UNIQUE', 'Y', '') AS 主键,
               decode(A.DATA_TYPE,'VARCHAR2','varchar','DATE','datetime',lower(A.DATA_TYPE)) AS 类型,
               decode(A.DATA_TYPE,'DATE',23,A.DATA_LENGTH) 长度,
               --decode(A.DATA_PRECISION,null,'0',a.DATA_PRECISION) AS 整数位数,
              decode( A.DATA_SCALE,NULL,'0',a.DATA_SCALE) AS 小数位数,
               DECODE(A.NULLABLE, 'Y', 'Y', '') AS 允许空,
               A.DATA_DEFAULT AS 默认值,
               F.COMMENTS AS 字段描述
          FROM USER_ALL_TABLES AA,
               USER_TAB_COLUMNS A,
               USER_COL_COMMENTS F,
               USER_TAB_COMMENTS TT,
               (SELECT B.TABLE_NAME,
                       B.INDEX_NAME,
                       B.UNIQUENESS,
                       C.COLUMN_NAME,
                       DECODE(D.CONSTRAINT_NAME, NULL, 'No', 'Yes') KEY
                  FROM USER_INDEXES B,
                       USER_IND_COLUMNS C,
                       (SELECT CONSTRAINT_NAME
                          FROM USER_CONSTRAINTS
                         WHERE CONSTRAINT_TYPE = 'P') D
                 WHERE B.INDEX_NAME = C.INDEX_NAME
                   AND B.INDEX_NAME = D.CONSTRAINT_NAME(+)) E
         WHERE
         --a.table_name in ('PLT_SEARCHFIELD')
         AA.TABLE_NAME = A.TABLE_NAME
         AND A.TABLE_NAME = E.TABLE_NAME(+)
         AND A.COLUMN_NAME = E.COLUMN_NAME(+)
         AND A.TABLE_NAME = F.TABLE_NAME
         AND A.COLUMN_NAME = F.COLUMN_NAME
         AND AA.table_name=TT.table_name
         ORDER BY A.TABLE_NAME, A.COLUMN_ID;









--查询创建日期。
SELECT CREATED FROM USER_OBJECTS WHERE OBJECT_NAME='TABLE';

--2008以下版本
SELECT 
--  字段序号=a.colorder,
表名=case when a.colorder=1 then d.name else d.name end,
 表说明=case when a.colorder=1 then isnull(f.value,'') else isnull(f.value,'') end,
 字段名=a.name,
-- 标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,
 主键=case when exists(SELECT 1 FROM sysobjects where xtype='PK' and name in (
  SELECT name FROM sysindexes WHERE indid in(
   SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid
  ))) then 'Y' else '' end,
 类型=b.name,
-- 占用字节数=a.length,
 长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'),
 小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
 允许空=case when a.isnullable=1 then 'Y'else '' end,
 默认值=isnull(e.text,''),
 字段描述=isnull(g.[value],'')
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  
 left join sysproperties f on d.id=f.id and f.smallid=0
--where d.name in ('avs_after_count')
order by a.id,a.colorder



----2008及以上的版本

SELECT 
--  字段序号=a.colorder,
表名=case when a.colorder=1 then d.name else d.name end,
 表说明=case when a.colorder=1 then isnull(f.value,'') else isnull(f.value,'') end,
 字段名=a.name,
-- 标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,
 主键=case when exists(SELECT 1 FROM sysobjects where xtype='PK' and name in (
  SELECT name FROM sysindexes WHERE indid in(
   SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid
  ))) then 'Y' else '' end,
 类型=b.name,
-- 占用字节数=a.length,
 长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'),
 小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
 允许空=case when a.isnullable=1 then 'Y'else '' end,
 默认值=isnull(e.text,''),
 字段描述=isnull(g.[value],'')
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.major_id and f.minor_id=0
--where d.name in ('avs_after_count')
order by a.id,a.colorder

select * from sys.extended_properties
select * from syscolumns;