我表中数据超过百万条记录,如何快速查询?
[dbo].[sb] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[code] [numeric](18, 0) NULL ,
[name] [nvarchar] (1500) NULL ,
[num] [nvarchar] (50) NULL ,
[hetong] [numeric](18, 0) NULL ,
[inda] [smalldatetime] NULL ,
[da] [datetime] NOT NULL ,
[used] [int] NOT NULL
)
[dbo].[sb] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[code] [numeric](18, 0) NULL ,
[name] [nvarchar] (1500) NULL ,
[num] [nvarchar] (50) NULL ,
[hetong] [numeric](18, 0) NULL ,
[inda] [smalldatetime] NULL ,
[da] [datetime] NOT NULL ,
[used] [int] NOT NULL
)
drop table index_tb
create table index_tb(id int constraint ck_id default 0,name varchar(20),xb varchar(2))
--查看表
exec sp_helpconstraint index_tb
--键不唯一,非聚集索引
create index id_index on index_tb(id)
--删除索引
drop index index_tb.id_index
--键聚集索引
create clustered index id_index on index_tb(id)
--删除索引
drop index index_tb.id_index
--创建check约束
alter table index_tb add constraint ck_index CHECK (name like '[0-9][0-9][0-9][0-9][0-9]')
alter table index_tb add constraint ck2_index check(xb in ('MM','GG'))
--删除check约束
alter table index_tb drop constraint ck2_index
--禁止表约束
alter table index_tb nocheck constraint ck_index
--恢复表约束
alter table index_tb check constraint ck_index
--禁止和恢复所有check-all关键字
select 'alter table '+name+' nocheck or check constraint all' from sysobjects where type='U'
--添加新默认值和约束
ALTER TABLE index_tb ADD CONSTRAINT de_name DEFAULT ('11111') FOR name
--删除表约束
alter table index_tb drop constraint de_name
-- 字段 UNIQUE NOT NULL = PRIMARY KEY 差不多
insert into index_tb(name,xb) select '12345','mm'select * from index_tbdelete index_tb
另外,可以考虑将你的表分类成多表存放,可能对业务有影响,不推荐