1,数据库关系图 ##用例1:查询数据 #01.查询QQ号码为54789625的所有好友信息,包括QQ号码,昵称,年龄 select RelationQQID as QQ号码,NickName as 昵称,Age as 年龄 from BaseInfo,Relation where BaseInfo.QQID=Relation.RelationQQID and Relation.QQID=54789625 and RelationStatus=0 或者1 #02.查询当前在线用户的信息 SELE
设置数据库的时候 qq 号如果用整型,设置成UNSIGNED,不然超过一定数值就错误 UPDATE `sao_qq` SET qq_num = REPLACE ( qq_num, '@qq.com', '' ); delete from sao_qq where qq_num not like '%qq.com%' select * from sao_qq where LENGTH(0+qq_pass)=LENGTH(qq_pass) 判断是否纯数字 delete from sao_qq whe
创建QQ数据库 #创建数据库 CREATE DATABASE QQ #创建表名 并且添加列 DROP TABLE IF EXISTS `dbo.BaseInfo`; CREATE TABLE `student`( QQID INT PRIMARY KEY AUTO_INCREMENT, NickName VARCHAR(), Sex INT, Age INT , Province VARCHAR(), City VARCHAR(), Address VARCHAR(), Phone INT )
When file is too large, we will compress it and split it into several parts. Now Let me show you how to combine them in Linux command line. step 1: Install rar command sudo apt-get install rar sudo apt-get install p7zip-full step 2: Merge rar files r
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Data.SqlClient;//引用 namespace 访问数据库 { class Program { static void Main(string[] args) { //定义一个变量承载数据库 位置 "server=.;表示 本地
