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mqsql已知iD查询其它3个相邻最近的iD

查询结果按照ID与已知值的距离排序,取一条记录,例如已知ID为555,那么查询语句为: SELECT * FROM tab ORDER BY ABS(id-555) 在PHP语言环境的语句为: $sql="SELECT * FROM tab ORDER BY ABS(id-$id)";

declare @cloumns varchar(40) declare @tablename varchar(40) declare @str varchar(40) declare @counts int declare @sql nvarchar(2000) 你这种带@的变量就不用声明了吧,直接 set @cloumns =""; set @tablename =""; set @str =""; set @c...

create table cdat(localt char(20) not null,cd char(5) not null,snosat char(2) not null,rnorec char(3) not null,id INT(20) not null AUTO_INCREMENT,primary key (id)); MySQL是一个开放源码的小型关联式数据库管理系统,开发者为瑞典MyS...

你可以用事物啊 多少条都可以

yQU0N6uaicDJ+NZZW4Hg6l5JzCsZJ0MqyXxpVw9E...QksxFv9iD6shtMYrQ7UbkNgKIKOwYqmMLSp6tu3xpXL5u...f6vtSUxqZST09UWmCqBptpsQlAw2A6tKfkCrVkdTHP02uLL...

SqlConnection conn=new SqlConnection(connectionString); conn.Open(); string sqlSting=" select Chuanghu,FangDaoMen,Select MQ_KG from ChuFang) as MQ_KG from anquanshebei "; SqlCommand comm=new SqlCommand(str_sql,conn); SqlDataRea...

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