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  • SQL Server 基础知识回顾

    背景:工作调整,由mysql转到sql server,从今天开始学习,进行知识储备。

    1. sql server查询数据库表结构说明
       1 -- 数据字典
       2 SELECT
       3         (case when a.colorder=1 then d.name else '' end)表名,
       4         a.colorder 字段序号,
       5         a.name 字段名,
       6         (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then ''else '' end) 标识,
       7        (case when (SELECT count(*)
       8         FROM sysobjects
       9         WHERE (name in
      10                 (SELECT name
      11                 FROM sysindexes
      12                 WHERE (id = a.id) AND (indid in
      13                          (SELECT indid
      14                         FROM sysindexkeys
      15                         WHERE (id = a.id) AND (colid in
      16                                   (SELECT colid
      17                                  FROM syscolumns
      18                                  WHERE (id = a.id) AND (name = a.name))))))) AND
      19             (xtype = 'PK'))>0 then '' else '' end) 主键,
      20        b.name 类型,
      21        a.length 占用字节数,
      22       COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
      23       isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,
      24       (case when a.isnullable=1 then ''else '' end) 允许空,
      25       isnull(e.text,'') 默认值,
      26       isnull(g.[value],'') AS 字段说明
      27 FROM  syscolumns  a left join systypes b
      28 on  a.xtype=b.xusertype
      29 inner join sysobjects d
      30 on a.id=d.id  and  d.xtype='U' and  d.name<>'dtproperties'
      31 left join syscomments e
      32 on a.cdefault=e.id
      33 left join sys.extended_properties g
      34 on a.id=g.major_id AND a.colid = g.major_id
      35 order by a.id,a.colorder,表名
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  • 原文地址:https://www.cnblogs.com/wchwch/p/12922385.html
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