楼上的: len 返回给定字符串表达式的字符(而不是字节)个数,其中不包含尾随空格。 而且对于Ntext 无效
SELECT 表名=case when a.colorder=1 then d.name else '' end, 表说明=case when a.colorder=1 then isnull(f.value,'') else '' end, 字段序号=a.colorder, 字段名=a.name, 标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'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 ))) then '√' else '' end, 类型=b.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), 允许空=case when a.isnullable=1 then '√'else '' end, 默认值=isnull(e.text,''), 字段说明=isnull(g.[value],'') FROM syscolumns a left join systypes b on a.xusertype=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='table_name' --如果要查询特定table,加上这句 order by a.id,a.colorder
SELECT COL_LENGTH('table','字段名')AS 字段長
select len(sno)as length into #temp from sc select cast (sum(length)/1024 as float ) from #temp drop table #temp 你把你想要得精度置換float 就行了把
select COL_LENGTH('表名','字段名') 這樣行﹗﹗
select cast( sum(len(字段名))/1024 as float ) from 表名 精度我也不會設置,小於1k的,顯示是0.0
楼上的 NTEXT 类型不能用LEN
select name,length 字节 from syscolumns --where object_name(id)='soldiers'
len 返回给定字符串表达式的字符(而不是字节)个数,其中不包含尾随空格。
而且对于Ntext 无效
表名=case when a.colorder=1 then d.name else '' end,
表说明=case when a.colorder=1 then isnull(f.value,'') else '' end,
字段序号=a.colorder,
字段名=a.name,
标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'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
))) then '√' else '' end,
类型=b.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),
允许空=case when a.isnullable=1 then '√'else '' end,
默认值=isnull(e.text,''),
字段说明=isnull(g.[value],'')
FROM syscolumns a
left join systypes b on a.xusertype=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='table_name' --如果要查询特定table,加上这句
order by a.id,a.colorder
select cast (sum(length)/1024 as float ) from #temp
drop table #temp
你把你想要得精度置換float 就行了把
select COL_LENGTH('表名','字段名')
這樣行﹗﹗
精度我也不會設置,小於1k的,顯示是0.0
NTEXT 类型不能用LEN
--where object_name(id)='soldiers'
FROM 表名
返回任何表达式所占用的字节数。DATALENGTH 对 varchar、varbinary、text、image、nvarchar 和 ntext 数据类型特别有用,因为这些数据类型可以存储可变长度数据。NULL 的 DATALENGTH 的结果是 NULL。