几条查询数据库信息的查询语句

查询数据库的表信息：

select [name],crdate,refdate from sysobjects where xtype='u' and [name]<>'sysdiagrams' order by [name]

查询表的字段信息：

select syscolumns.name,systypes.name as type, syscolumns.length max_length,cast(syscolumns.isnullable as bit) is_nullable,isPK = Case when exists ( select 1 from sysobjects inner join sysindexes on sysindexes.name = sysobjects.name inner join sysindexkeys on sysindexes.id = sysindexkeys.id and sysindexes.indid = sysindexkeys.indid where xtype='PK' and parent_obj = syscolumns.id and sysindexkeys.colid = syscolumns.colid ) then cast(1 as bit) else cast(0 as bit) end ,is_identity = Case syscolumns.status when 128 then cast(1 as bit) else cast(0 as bit) end from syscolumns inner join systypes on ( syscolumns.xtype = systypes.xtype and systypes.name <>'_default_' and systypes.name<>'sysname' ) left outer join sys.extended_properties on ( sys.extended_properties.major_id=syscolumns.id and minor_id=syscolumns.colid ) where syscolumns.id = (select id from sysobjects where name='" + 要查询的表名 + "') order by syscolumns.colid

查询数据库的所有架构：

select * from sys.schemas

SELECT * FROM INFORMATION_SCHEMA.TABLES

 

查询所有信息：

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_date
FROM 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