INFANL01-3 ANALYSE 3

WEEK 3

March 2015Institute voor Communication, Media en Informatietechnology

AGENDA

▸ CREATE ,

▸ INSERT, SELECT en

▸ UPDATE

CREATE

CREATE▸ SQL CREATE DATABASE Syntax

▸ The SQL CREATE TABLE Statement▸ The CREATE TABLE statement is used to create a table in a

database.▸ Tables are organized into rows and columns; and each table must

have a name▸ SQL CREATE TABLE Syntax

CREATE DATABASE dbname;

CREATE TABLE table_name(column_name1 data_type(size),column_name2 data_type(size),column_name3 data_type(size),....);

EXAMPLE

▸ See http://www.w3schools.com/sql/sql_create_db.asp▸ http://www.w3schools.com/sql/sql_create_table.asp

INSERT

INSERT

▸ The SQL INSERT INTO Statement▸ The INSERT INTO statement is used to insert new records in a

table

▸ SQL INSERT INTO Syntax▸ It is possible to write the INSERT INTO statement in two forms.▸ The first form does not specify the column names where the data

will be inserted, only their values:

▸ The second form specifies both the column names and the values to be inserted:

INSERT INTO table_nameVALUES (value1,value2,value3,...);

INSERT INTO table_name (column1,column2,column3,...)VALUES (value1,value2,value3,...)

EXAMPLE

▸ See: http://www.w3schools.com/sql/sql_insert.asp

SELECT

SELECT

▸ The SQL SELECT Statement▸ The SELECT statement is used to select data from a database.▸ The result is stored in a result table, called the result-set.

▸ SQL SELECT Syntax▸ It is possible to write the INSERT INTO statement in two forms.

▸ and

SELECT column_name,column_nameFROM table_name;

SELECT * FROM table_name;

EXAMPLE

▸ See http://www.w3schools.com/sql/sql_select.asp

UPDATE

UPDATE

▸ The SQL UPDATE Statement▸ The UPDATE statement is used to update existing records in a

table.

▸ SQL UPDATESyntax

◦ Notice the WHERE clause in the SQL UPDATE statement!◦ The WHERE clause specifies which record or records that

should be updated. If you omit the WHERE clause, all records will be updated!

UPDATE table_nameSET column1=value1,column2=value2,...WHERE some_column=some_value;

EXAMPLE

▸ See http://www.w3schools.com/sql/sql_select.asp

JOIN

JOINS▸ SQL JOIN▸ An SQL JOIN clause is used to combine rows from two or more

tables, based on a common field between them.▸ The most common type of join is: SQL INNER JOIN (simple join). An

SQL INNER JOIN return all rows from multiple tables where the join condition is met

▸ SQL INNER JOIN Syntax

▸ Different SQL JOINs

SELECT Orders.OrderID, Customers.CustomerName, Orders.OrderDateFROM OrdersINNER JOIN CustomersON Orders.CustomerID=Customers.CustomerID;

INNER JOIN: Returns all rows when there is at least one match in BOTH tablesLEFT JOIN: Return all rows from the left table, and the matched rows from the right tableRIGHT JOIN: Return all rows from the right table, and the matched rows from the left tableFULL JOIN: Return all rows when there is a match in ONE of the tables

EXAMPLE

▸ See http://www.w3schools.com/sql/sql_join.asp