如何使用SELECT语句查询返回一个表的数据结构。
如何使用SELECT语句查询返回一个表的数据结构。

我希望得到如同SQL2000企业管理器中的设计表时显示的内容。

“列名”，“数据类型”，“长度”，“允许空”



[解决办法]

SQL code

SELECT  表名=case when a.colorder=1 then d.name else '' end, 字段序号=a.colorder, 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 '√' 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 '√'else '' end, 默认值=isnull(e.text,''), 字段说明=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  order by a.id,a.colorder
[解决办法]
SQL code
--sql server 2000SELECT     表名       = case when a.colorder=1 then d.name else '' end,    表说明     = case when a.colorder=1 then isnull(f.value,'') else '' end,    字段序号   = a.colorder,    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 parent_obj=a.id and name in (                     SELECT name FROM sysindexes WHERE indid in(                        SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid))) then '√' 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 '√'else '' end,    默认值     = isnull(e.text,''),    字段说明   = isnull(g.[value],'')FROM     syscolumns aleft join     systypes b on     a.xusertype=b.xusertypeinner join     sysobjects d on     a.id=d.id  and d.xtype='U' and  d.name<>'dtproperties'left join     syscomments e on     a.cdefault=e.idleft 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=0where     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--sql server 2005-- 1. 表结构信息查询 -- ========================================================================-- 表结构信息查询-- 邹建 2005.08(引用请保留此信息)-- ========================================================================SELECT     TableName=CASE WHEN C.column_id=1 THEN O.name ELSE N'' END,    TableDesc=ISNULL(CASE WHEN C.column_id=1 THEN PTB.[value] END,N''),    Column_id=C.column_id,    ColumnName=C.name,    PrimaryKey=ISNULL(IDX.PrimaryKey,N''),    [IDENTITY]=CASE WHEN C.is_identity=1 THEN N'√'ELSE N'' END,    Computed=CASE WHEN C.is_computed=1 THEN N'√'ELSE N'' END,    Type=T.name,    Length=C.max_length,    Precision=C.precision,    Scale=C.scale,    NullAble=CASE WHEN C.is_nullable=1 THEN N'√'ELSE N'' END,    [Default]=ISNULL(D.definition,N''),    ColumnDesc=ISNULL(PFD.[value],N''),    IndexName=ISNULL(IDX.IndexName,N''),    IndexSort=ISNULL(IDX.Sort,N''),    Create_Date=O.Create_Date,    Modify_Date=O.Modify_dateFROM sys.columns C    INNER JOIN sys.objects O        ON C.[object_id]=O.[object_id]            AND O.type='U'            AND O.is_ms_shipped=0    INNER JOIN sys.types T        ON C.user_type_id=T.user_type_id    LEFT JOIN sys.default_constraints D        ON C.[object_id]=D.parent_object_id            AND C.column_id=D.parent_column_id            AND C.default_object_id=D.[object_id]    LEFT JOIN sys.extended_properties PFD        ON PFD.class=1             AND C.[object_id]=PFD.major_id             AND C.column_id=PFD.minor_id--             AND PFD.name='Caption'  -- 字段说明对应的描述名称(一个字段可以添加多个不同name的描述)    LEFT JOIN sys.extended_properties PTB        ON PTB.class=1             AND PTB.minor_id=0             AND C.[object_id]=PTB.major_id--             AND PFD.name='Caption'  -- 表说明对应的描述名称(一个表可以添加多个不同name的描述)     LEFT JOIN                       -- 索引及主键信息    (        SELECT             IDXC.[object_id],            IDXC.column_id,            Sort=CASE INDEXKEY_PROPERTY(IDXC.[object_id],IDXC.index_id,IDXC.index_column_id,'IsDescending')                WHEN 1 THEN 'DESC' WHEN 0 THEN 'ASC' ELSE '' END,            PrimaryKey=CASE WHEN IDX.is_primary_key=1 THEN N'√'ELSE N'' END,            IndexName=IDX.Name        FROM sys.indexes IDX        INNER JOIN sys.index_columns IDXC            ON IDX.[object_id]=IDXC.[object_id]                AND IDX.index_id=IDXC.index_id        LEFT JOIN sys.key_constraints KC            ON IDX.[object_id]=KC.[parent_object_id]                AND IDX.index_id=KC.unique_index_id        INNER JOIN  -- 对于一个列包含多个索引的情况,只显示第1个索引信息        (            SELECT [object_id], Column_id, index_id=MIN(index_id)            FROM sys.index_columns            GROUP BY [object_id], Column_id        ) IDXCUQ            ON IDXC.[object_id]=IDXCUQ.[object_id]                AND IDXC.Column_id=IDXCUQ.Column_id                AND IDXC.index_id=IDXCUQ.index_id    ) IDX        ON C.[object_id]=IDX.[object_id]            AND C.column_id=IDX.column_id -- WHERE O.name=N'要查询的表'       -- 如果只查询指定表,加上此条件ORDER BY O.name,C.column_id -- 2. 索引及主键信息 -- ========================================================================-- 索引及主键信息-- 邹建 2005.08(引用请保留此信息)-- ========================================================================SELECT     TableId=O.[object_id],    TableName=O.Name,    IndexId=ISNULL(KC.[object_id],IDX.index_id),    IndexName=IDX.Name,    IndexType=ISNULL(KC.type_desc,'Index'),    Index_Column_id=IDXC.index_column_id,    ColumnID=C.Column_id,    ColumnName=C.Name,    Sort=CASE INDEXKEY_PROPERTY(IDXC.[object_id],IDXC.index_id,IDXC.index_column_id,'IsDescending')        WHEN 1 THEN 'DESC' WHEN 0 THEN 'ASC' ELSE '' END,    PrimaryKey=CASE WHEN IDX.is_primary_key=1 THEN N'√'ELSE N'' END,    [UQIQUE]=CASE WHEN IDX.is_unique=1 THEN N'√'ELSE N'' END,    Ignore_dup_key=CASE WHEN IDX.ignore_dup_key=1 THEN N'√'ELSE N'' END,    Disabled=CASE WHEN IDX.is_disabled=1 THEN N'√'ELSE N'' END,    Fill_factor=IDX.fill_factor,    Padded=CASE WHEN IDX.is_padded=1 THEN N'√'ELSE N'' ENDFROM sys.indexes IDX    INNER JOIN sys.index_columns IDXC        ON IDX.[object_id]=IDXC.[object_id]            AND IDX.index_id=IDXC.index_id    LEFT JOIN sys.key_constraints KC        ON IDX.[object_id]=KC.[parent_object_id]            AND IDX.index_id=KC.unique_index_id    INNER JOIN sys.objects O        ON O.[object_id]=IDX.[object_id]    INNER JOIN sys.columns C        ON O.[object_id]=C.[object_id]            AND O.type='U'            AND O.is_ms_shipped=0            AND IDXC.Column_id=C.Column_id--    INNER JOIN  -- 对于一个列包含多个索引的情况,只显示第1个索引信息--    (--        SELECT [object_id], Column_id, index_id=MIN(index_id)--        FROM sys.index_columns--        GROUP BY [object_id], Column_id--    ) IDXCUQ--        ON IDXC.[object_id]=IDXCUQ.[object_id]--            AND IDXC.Column_id=IDXCUQ.Column_id 
 
[解决办法]
你要的比较简单
SQL code
  select     '列名'   = name,     '数据类型'     = type_name(xusertype),     '长度'    = convert(int, length),     '允许空'    = case when isnullable = 0 then '' else '√' end  from syscolumns where id = object_id('t_你的表') and number = 0 order by colid