sql from w3school

I. Study 1, WWW-World Wide Web what is WWW? www (World Wide web) The World Wide Web is often referred to as The web is a network of computers all over the world All computers in the WEB can communicate with each other All of

1. SQL DML and DDLSQL can be divided into two parts: Data manipulation Language (DML) and data definition language (DDL).SQL (Structured Query language) is the syntax for executing queries. However, the SQL language also contains syntax for updating,

SQL Basics 1.SQL not sensitive to case2.DML(Data Manipulation language) and DDL(data definition Language)A) DML SELECT UPDATE DELETE INSERT into b) DDL CREATE DATABASE ALTER DATABASE CREATE TABLE

1. Date functionMssql:SELECT GETDATE ()Returns the current date and timeSELECT DATEPART (yyyy,orderdate) as OrderYear,DATEPART (mm,orderdate) as OrderMonth,DATEPART (dd,orderdate) as OrderdayFrom Orders1WHERE orderid=1Returns a separate part of the

Original link: Http://www.flygon.net/w3schoolOriginal link: Https://github.com/wizardforcel/w3schoolW3school Tutorial Finishing Offline version of most of the finishing from W3cschool, a small part of the finishing from the W3school, from my

Summarizes various Java API documents, including the download of. chm files, HTML, java, w3school, servlet, js, spring, and so on. chmw3school This article will update the new API, if you think there is a new version or have a new API, you can also

1. Build the original tableUse [Northwind]GO/****** object:table [dbo].    [Persons] Script DATE:2016/6/8 7:31:57 ******/SET ANSI_NULLS onGOSET QUOTED_IDENTIFIER ONGOCREATE TABLE [dbo]. [Persons] ([ID] [INT] IDENTITY (*) Not NULL,[LastName]

SQL SELECT StatementTo get the contents of a column named "LastName" and "FirstName" (from a database table named "Persons"), use a SELECT statement like this:SELECT Lastname,firstname from Persons"Persons" table: Id LastName

Select statements are used to select data from a table.The result is stored in a result table, called a result set.SQL SELECT SyntaxSELECT column name from table nameAnd:SELECT * FROM table nameNote : The SQL statement is not case sensitive. Select

SQL SELECT StatementSelect statements are used to select data from a table.The result is stored in a result table, called a result set.SQL SELECT SyntaxSELECT column name from table nameAnd:SELECT * FROM table nameNote: The SQL statement is not case