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

    

SQL Server 基础知识回顾