十年磨一剑

1.SELECT a.选择所有数据b.选择某列c.选择多列d.选择某行某列其他WHERE语句WHERE age between 32 and 38WHERE gender='Male'e. 排序默认增序：order by age  降序排列：order by desc2.DELETE语句DELETE F

1. reedit employeeinfo window2. modify employeeinfo.cpp#include "employeeinfo.h"#include "ui_employeeinfo.h"#include "login.h"#include EmployeeInfo::EmployeeInfo(QWidget *parent) : QDi

1. modify employeeinfo window2. modify employeeinfo.cpp#include "employeeinfo.h"#include "ui_employeeinfo.h"#include "login.h"#include EmployeeInfo::EmployeeInfo(QWidget *parent) : QDi

1.modify employeeinfo window2.modify employeeinfo.cpp#include "employeeinfo.h"#include "ui_employeeinfo.h"#include "login.h"#include EmployeeInfo::EmployeeInfo(QWidget *parent) : QDial

1.modify employeeinfo window2. modify employee.cpp #include "employeeinfo.h"#include "ui_employeeinfo.h"#include "login.h"#include EmployeeInfo::EmployeeInfo(QWidget *parent) : QDialog

1. modify employeeinfo.cpp #include "employeeinfo.h"#include "ui_employeeinfo.h"#include "login.h"#include EmployeeInfo::EmployeeInfo(QWidget *parent) : QDialog(parent), ui(new Ui::Emplo

1.modify the employeeinfo.cpp#include "employeeinfo.h"#include "ui_employeeinfo.h"#include "login.h"#include EmployeeInfo::EmployeeInfo(QWidget *parent) : QDialog(parent), ui(new Ui::Emp

#include "mainwindow.h"#include "ui_mainwindow.h"#include #include MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow){ ui->setupUi(this);}MainWi

quote from: http://www.sqlite.org/lang_datefunc.htmlDate And Time FunctionsSQLite supports five date and time functions as follows:date(timestring, modifier, modifier, ...)time(timestring, m

1. modify the employeeinfo window2. modify the employeeinfo.cpp#include "employeeinfo.h"#include "ui_employeeinfo.h"#include "login.h"#include EmployeeInfo::EmployeeInfo(QWidget *parent) :

1. reedit the employeeinfo window as2. modify the employeeinfo.cpp#include "employeeinfo.h"#include "ui_employeeinfo.h"#include "login.h"#include EmployeeInfo::EmployeeInfo(QWidget *parent

1. reedit the employinfo window like2.reedit the employinfo.cpp as#include "employeeinfo.h"#include "ui_employeeinfo.h"#include "login.h"#include EmployeeInfo::EmployeeInfo(QWidget *pa

1.导出CSV格式a.右键点击要导出的table名，选择export tableb.然后打开export wizard，打开CSV标签，进行一些设置后，便可以选择保存位置了c.最后打开效果2.导出EXCEL格式跟导出CSV一样，只不过有几个小地方需要该一下1.2.保存的时候，后缀名保存为.xls最后打开来看：

1.将csv文件导入到SQLite databasea.选择 database->importb.选择数据类型 c.然后在Execute SQL里面执行SELECT * FROM employee就会看到所有结果

1.打开firebox，在add-ons里面搜索 sqlite manager , 然后安装2.然后选择Tools->SQLite Manager3. 然后就可以管理自己的数据库了

1. 输入sudo apt-get install sqlite3 libsqlite3-dev2.安装完后，会提示这样3.然后我们可以进行一些简单的操作退出   sqlite> .quit创建数据库   seamanj@seamanj-Lenovo-IdeaPad-Y400:~$ sqlite3 company.db创建表格 sql

1. download sqlite tools containing sqlite3.exe from the official website:https://www.sqlite.org/download.htmlAt this time in my situation the link is:https://www.sqlite.org/2016/sqlite-tools-wi

1. create a qt widgets application, name it as Sqlite_DB, modify the class name as Login2. switch to ui designer, drag a label onto the window used for showing the prompting information3. modify t

1. Following the work in qt tutorial 7, we add some widgets on our window2. create a table named employeeinfoinsert some data into the table3. modify login.h as follows:#ifndef

1. drag a label widget on the window, remove the string contained:2. insert two lines into class login constructor function in login.cpp:login::login(QWidget *parent) : QMainWindow(parent)

/*CREATE TABLE "english" ("id" INTEGER PRIMARY KEY AUTOINCREMENT ,"chinese" TEXT NOT NULL UNIQUE CHECK ("chinese" <> ''),"english" TEXT NOT NULL UNIQUE CHECK ("english" <> ''),"date" DATETIME N