create table employee

Install MySQLInstalling MySQL on Ubuntu is very simple and requires just a few commands to complete.sudo apt-get install mysql-serversudo apt-get isntall mysql-clientsudo apt-get install libmysqlclient-devDuring installation, you will be prompted to

The main contents of this chapter: First, foreign key Second, table connection Third, sub-query Iv. Index First, FOREIGN key: 1. What is a foreign key 2. Foreign KEY syntax 3, FOREIGN key conditions 4.

Case: The PHP backend code allows the employee's information to be deleted, the deleted employee information will be restored (similar to recovering employee information from the Recycle Bin), and the deleted employee can also be emptied (similar to

Summary IBM provides the community with the DB2 free version of DB2 Express-c, which provides the same core data features as DB2 Express Edition, laying a solid foundation for building and deploying applications. Relational database is a widely used

Pymysql is a library used in the python3.x version to connect to the MySQL server, and MySQLdb is used in Python2.Pymysql follows the Python database API v2.0 specification and includes the Pure-python MySQL client library.Pymysql Installation1. PIP

==================================#!/usr/bin/python#-*-Coding:utf-8-*-Import MySQLdb# Open Database connectiondb = MySQLdb.connect ("localhost", "testuser", "test123", "TESTDB", charset= ' UTF8 ')# get an action cursor using the cursor ()

2018-07-12 14:44:27Iv. Index1. Create an indexCreate manually:Create index index name on table name (column name, [column name, ...] ）CREATE TABLE Employee (Pno Number (7),PName VARCHAR2 (20));CREATE index Inx_scott_pno on employee (pno);INSERT into

1. Multi-Table QueryCreate two tables in advance, Department table (department), employee table (employee)CREATE TABLE Department (ID int,name varchar (20) ; CREATE table employee (ID int primary KEY auto_increment,name varchar (20), sex enum ('male'

1. Install the driverThere are currently two mysq L drives, and we can choose one to install:Mysql-python: Is the python driver that encapsulates the MySQL C driver; Mysql-connector-python: It's the official MySQL-only Python

What is Pymysql?Pymysql is a library used in the python3.x version to connect to the MySQL server, and MySQLdb is used in Python2.Pymysql follows the Python database API v2.0 specification and includes the Pure-python MySQL client library.Pymysql

Create a library operationHttp://www.cnblogs.com/linhaifeng/articles/7211690.html---------------------------------1, create database homework; Create DATABASE)2, show create database homework; Query creation Process3, drop database homework;

In this paper, we introduce Python3 to use Pymysql Connection database, and realize simple and delete to change.What is Pymysql?Pymysql is a library used in the python3.x version to connect to the MySQL server, and MySQLdb is used in Python2.Pymysql

I. Data integrity1. Entity integrity2. Domain integrity (column integrity constraints):A column (that is, a field) of a database table must conform to a specific data type or constraint.Constraints:Type constraint: ID intLength constraint: ID int (3)

Python can actually manipulate the database, think if you can write SQL statements in Python, and thus directly achieve the purpose of manipulating the database, how cool!Python's standard database interface is Python DB-API, which installs

After the configuration of the Hive ODBC driver is successful, it becomes easier to access it through C #, which is divided into query and update operations, directly attached to the test code. The target platform for C # Engineering compilation

I. Introduction to the Database1. DatabaseA database (DATABASE,DB) is a collection of organized, shareable data that is stored in a computer for a long period of time. The data in the database is organized, described and stored according to a

I. Introduction to the database 1, databaseA database (DATABASE,DB) is a collection of organized, shareable data that is stored in a computer for a long period of time. The data in the database is organized, described and stored in a certain

I. SQL statements about database operations--1Create a database (create a corresponding folder on disk) Create databases [ifNOT EXISTS] db_name [characterSetXXX]--2. View the database show databases; View all databases show create database db_name;

I. Related content1. Understand the concept, role, and type of triggers.2. Practice the creation and use of triggers.Second, the specific operationExperimental1. Use triggers to perform a security check on DML operations performed on the Scott.emp

Original: T-SQL Development--id processing articleThe difference between identity, Timestamp and uniqueidentifier in the database self-increment ID function: Problem phenomenon:The generation of general serial numbers is implemented using T-SQL