MySQL Understanding Basic Joins

Question

I am struggling to understand basic MySQL joins.

Basically I\'ve got 2 tables one with a customer first name and address id in it and another with the actual address.

Answer 1

SELECT  a.name, b.address
FROM    Customer a INNER JOIN AddressList b on a.addressID = b.addressID

To learn more about joins, see the article below,

• Visual Representation of SQL Joins

Answer 2

It would be:

SELECT firstName, address FROM Address As A 
INNER JOIN Customer as C ON C.addressId=A.addressId

Visual Representation of JOINS

Answer 3

Lets say that you have following tables:

Customer(ID, FName, LName, AddressID)
Address(AddressID, Streeet, HNUmber, City)

This will display customers address instead of AddressID:

SELECT c.ID, c.Fname, c.LName, a.Street, a.HNumber, a.City
FROM Customer c, Address a
WHERE
  c.AddressID = a.AddressID

Answer 4

Put the same 'addressid' in both the name and address tables then join the two as:

select name, address from customer join addresses 
on customer.addressid = addresses.addressid;

Answer 5

Assuming that both tables have an address id, you could use

SELECT firstname, address, from table1 JOIN table2 
ON table1.addressid = table2.addressid

Answer 6

Your condition is inner join, This is the simplest, most understood Join and is the most common. This query will return all of the records in the left table (Customer) that have a matching record in the right table (address). This Join is written as follows:

 SELECT firstName, address FROM Customer 
 INNER JOIN address ON Customer.addressId=address.addressId

SQL_LIVE_DEMO

Sample Output :

FIRSTNAME       ADDRESS
  Bob       45 Somewhere street