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sqlserver增删改查一些不常用的小技巧 - 站长搜索
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sqlserver增删改查一些不常用的小技巧

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2022-09-23 17:30:23 转载来源: 网络整理/侵权必删

一Insert语句1.在数据中只插入默认值:insertinto[DBTrain]

一 Insert 语句

1.在数据中只插入默认值:

insert into [DBTrain].[dbo].[log_info]
default values

2.在可以为null 的字段中,如果要设置null,可以按下[Ctrl+0],注意是零不是o,如果要恢复修改前的值按[Esc]

二 Update 语句

可以更新前几条或某个百分比的数据

update top(3) [log_info]
set info1 = '1001'

update top(80) percent [log_info]
set info2 = '1002'

三 Delete 语句同样可以使用top 关键字

四 Select 语句

1. With Ties

执行下面sql:select top 5 * from test
order by id desc

结果见下图:

再执行以下sql 看不同:

select top 5 with ties * from test
order by id desc

可以看出来当前五条记录还没有把id = 2的数据显示完整的时候,

使用with ties,就可以把id = 2 的记录都显示出来

待续. $identity, $RowGuid,Write子句

标签: sqlserver 删改 一些 不常 用的 技巧


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