sql server表外键查询

--本表外键
SELECT
f.name AS foreign_key_name
,OBJECT_NAME(f.parent_object_id) AS table_name
,COL_NAME(fc.parent_object_id, fc.parent_column_id) AS constraint_column_name
,OBJECT_NAME (f.referenced_object_id) AS referenced_object
,COL_NAME(fc.referenced_object_id, fc.referenced_column_id) AS referenced_column_name
,is_disabled
,delete_referential_action_desc
,update_referential_action_desc
FROM sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fc
ON f.object_id = fc.constraint_object_id
WHERE f.parent_object_id = OBJECT_ID('table_name');


--外键被参考表
SELECT 主键列ID=b.rkey
    ,主键列名=(SELECT name FROM syscolumns WHERE colid=b.rkey AND id=b.rkeyid)
    ,外键表ID=b.fkeyid
    ,外键表名称=object_name(b.fkeyid)
    ,外键列ID=b.fkey
    ,外键列名=(SELECT name FROM syscolumns WHERE colid=b.fkey AND id=b.fkeyid)
    ,级联更新=ObjectProperty(a.id,'CnstIsUpdateCascade')
    ,级联删除=ObjectProperty(a.id,'CnstIsDeleteCascade')
FROM sysobjects a
    join sysforeignkeys b on a.id=b.constid
    join sysobjects c on a.parent_obj=c.id
where a.xtype='f' AND c.xtype='U'
    and object_name(b.rkeyid)='table_name'

 sql server指定数据库所有表结构查询:

SELECT
CASE
        
    WHEN
        col.colorder = 1 THEN
            obj.name ELSE '' 
            END AS 表名,
        col.colorder AS 序号 ,
        col.name AS 列名 ,
        ISNULL( ep.[value], '' ) AS 列说明 ,
        t.name AS 数据类型 ,
        col.length AS 长度 ,
        ISNULL( COLUMNPROPERTY( col.id, col.name, 'Scale' ), 0 ) AS 小数位数 ,
    CASE
            
            WHEN COLUMNPROPERTY( col.id, col.name, 'IsIdentity' ) = 1 THEN
            '√' ELSE '' 
        END AS 标识 ,
    CASE
            
            WHEN EXISTS (
            SELECT
                1 
            FROM
                dbo.sysindexes si
                INNER JOIN dbo.sysindexkeys sik ON si.id = sik.id 
                AND si.indid = sik.indid
                INNER JOIN dbo.syscolumns sc ON sc.id = sik.id 
                AND sc.colid = sik.colid
                INNER JOIN dbo.sysobjects so ON so.name = si.name 
                AND so.xtype = 'PK' 
            WHERE
                sc.id = col.id 
                AND sc.colid = col.colid 
                ) THEN
                '√' ELSE '' 
            END AS 主键 ,
        CASE
                
                WHEN col.isnullable = 1 THEN
                '√' ELSE '' 
            END AS 允许空 ,
            ISNULL( comm.text, '' ) AS 默认值 
        FROM
            dbo.syscolumns col
            LEFT JOIN dbo.systypes t ON col.xtype = t.xusertype
            INNER JOIN dbo.sysobjects obj ON col.id = obj.id 
            AND obj.xtype = 'U' 
            AND obj.status >= 0
            LEFT JOIN dbo.syscomments comm ON col.cdefault = comm.id
            LEFT JOIN sys.extended_properties ep ON col.id = ep.major_id 
            AND col.colid = ep.minor_id 
            AND ep.name = 'MS_Description'
            LEFT JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id 
            AND epTwo.minor_id = 0 
            AND epTwo.name = 'MS_Description' 
    WHERE
    obj.name IN ( SELECT sys.tables.name as TableName from sys.tables)