SQL 通过SQL语句检索字段类型、长度、主键

SQL 通过SQL语句检索字段类型、长度、主键

方式1：

select 字段名=a.name,
标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '是' 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))) and a.isnullable<>1 then '是' else '' end,
类型=b.name,
长度=a.length,
允许空=case when a.isnullable=1 then '是' else '' end,
默认值=isnull(e.text,'')
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
--left join sysproperties f on d.id=f.id and f.smallid=0
where d.name='表名'
--where d.name='表名' [ and a.name= '字段名' ]

方式2：

select 
字段名=a.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)
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.status>=0
where d.name='表名'

　　

　　

　　

创建时间：2020.11.12　　更新时间：