create table employee

==============================SQL Memo CRUD queries multi-table events, etc.===============================--------------------------------------------------------------------------------------------------A. Database   1. Creating database   Create

CSV stands for comma-separated values, sometimes referred to as comma-separated values. andIf the TXT file is loaded, then the file should have a comma-separated value. And the file should be like thisHere is the script to create the table:CREATE

Use test;CREATE TABLE ' employee ' (emp_no int unsigned,Emp_name varchar (30),Emp_sex varchar (3),Emp_age tinyint unsigned,Sal Double,History datetime);INSERT into employee values (1, ' Zhang San ', ' Male ', 18, 5000, ' 2012-04-23 '),(2, ' John Doe

==============================SQL Memo CRUD queries multi-table events, etc.===============================--------------------------------------------------------------------------------------------------A. Database   1. Creating database   Create

1. Installation of MySQL databaseDatabase, mainly for the storage of data2. mysql specificationSQL statements can be written one or more lines, with a semicolon-terminated statement capitalized, and a variable named lowercase3. Operation of MySQL

Reference: http://www.w3cschool.cc/python/python-mysql.htmlAssume: MySQL has been installed and the database has been created TESTDB The user named "TestUser" is used to connect to the database TestDB and the password is "test123"

I. Integrity constraintsConstraints are similar to data type widths and are optional parameters that are used primarily to ensure data integrity and consistency.1, NOT NULL and defaultNull is nullable, the table defaults to null, and empty content

--########## 01, use of limit and paging ######### #INSERT into Studentinfo VALUES (null, ' Liu Bei ', ' male ', ' + '), (null, ' Guan Yu ', ' Male ', '), (NULL, ' Zhang Fei ', ' Male ', ', ' (null, ' Marten cicada ', ' female ', '), (null, ' bu ', '

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 mathematical model, with small redundancy,

and self-study, the SQL of some of the commonly used statements reviewed again. Tidy up as follows:1 increase1.1 "Insert single line"Insert [into] (column name) values (column values)Example: INSERT into strdents (name, gender, date of birth)

First, view the data table structure1) View the table basic Structure statement DESCRIBESyntax: DESCRIBE table name;Example:Mysql> DESCRIBE product;+--------------+--------------+------+-----+---------+----------------+| Field | Type |

SELECT * FROM Manager;select * from Dish;select * from Board;select * to Employee;select * from Orders;select * from Ord Er_detail; --Menu Table CREATE table dish (Dishid number (Ten) primary key, Dishname varchar2 () not null unique, category

Install MySQL on WindowsInstalling MySQL on Windows only requires downloading the Windows version of the MySQL installation package and extracting the installation package.Double-click the Setup.exe file to complete the installation.Next, you can

1. Ask for a class math average score.(1). Select sum (Math)/count (math) as math average scorefrom student;(2). Select AVG (math) as math averagefrom student;(3). Select AVG (name) as Xiao Ming's average scoreFrom student;//02. Ask for the average

I. Introduction of the Database1. Structured Query Language (Structured Query language)2, SQL: industry standard. (supported by each database vendor)Sql-server: The standard has been extended. TSQL dialectOracle: Scaling standards.

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

Reference http://www.cnblogs.com/jerrmy/archive/2013/03/13/2958352.htmlOracle is a little different from other databases when creating a table, such as SQL Server can add identity to a field of type int (1), the field will be increased by +1, and

1. Ask for a class math average score.(1). Select sum (Math)/count (math) as math average scorefrom student;(2). Select AVG (math) as math averagefrom student;(3). Select AVG (name) as Xiao Ming's average scoreFrom student;//02. Ask for the average

This article mainly introduces the usage of MYSQLDB module in Python, describes in detail the various common operation methods of MYSQLDB module for MySQL database, and it has practical value, so the friend who needs can refer toThis example

Write a SQL query to get the nth highest salary from the Employee table.+----+--------+| Id | Salary |+----+--------+| 1 | | | 2 | | | 3 | |+----+--------+For example, given the above Employee table, the n-th highest salary where n = 2 is 2