w3school sql select

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,

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

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. 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]

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

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 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

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

ArticleDirectory Syntax: "Orders" table: Result: Result:   SQL select distinct statement Duplicate values may exist in the table. This is not a problem. However, sometimes you may want to list only different values. The

SQL SELECT DISTINCT StatementIn the table, duplicate values may be included. That's not a problem, but sometimes you might want to just list different values (distinct).Keyword DISTINCT is used to return only different values.Grammar:SELECT DISTINCT