对于SQL Server数据库有两种方法查询表结构
第一种方法
sp_help Accounts_Users
第二种方法
sp_columns Accounts_Users
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 sys.extended_properties g on a.id=g.major_id and a.colid=g.minor_id
left join sys.extended_properties f on d.id=f.major_id and f.minor_id=0
--where d.name='orders' --如果只查询指定表,加上此条件
order by a.id,a.colorder
--SQL SERVER 创建可为NULL 唯一约束
CREATE UNIQUE NONCLUSTERED INDEX un_JsHBBWDPTSXF_SHJYH ON JsHBBWDPTSXF(SHJYH) WHERE shjyh is not null ;
--添加列唯一约束
alter table shjyhlx add constraint shjyh_unique unique(shjyh);
--修改字段的类型
alter table xfjl modify (xfje number(8,2));
--添加列
alter table dj_user add prov varchar(20);
--删除约束
DROP INDEX un_JsXFXX_tb ON JsXFXX;
-- 删除列
ALTER TABLE skpxsjl DROP COLUMN stbs
--更改表名
EXEC sp_rename 'table1', 'table2';
第一种方法
sp_help Accounts_Users