mysql query with left outer join and average - mysql

Question

I have two tables in mysql. The first table is names have the following dates:
name service number
carlos telephone 6
juan watter 12
maria gas 23
jhon hostal 17
marcos sleeping 21
carlos othercarlos 12
other other 13
And i have other table alias
name service alias price
carlos telephone telephone-carlos 700
carlos sleeping sleeping-carlos 300
juan watter watter-juan 900
maria gas gas-maria 650
jhon hostal hostal-jhon 700
And i need a view with name, alias, number and prince.
But i need all rows in name i intent with a left outer join.
But the problem is that when i do the query when is othercarlos i need that the price will be the average of carlos services and when the name is other i need that appear the average of all services. But appear null
http://sqlfiddle.com/#!2/c1d4f/1
I create this tables and my query

Answer 1

Ok, I'm sure that there are better ways to do this, but I can at least offer you one way:
SELECT t1.name,
t1.service,
t2.alias,
t1.number,
COALESCE(t2.price,t3.price,t4.price) AS price
FROM name t1
LEFT JOIN alias t2
ON t1.name= t2.name
AND t1.service = t2.service
LEFT JOIN ( SELECT name, AVG(price) AS price
FROM alias
GROUP BY name) t3
ON t1.name = t3.name
LEFT JOIN ( SELECT AVG(price) AS price
FROM alias) t4
ON t1.name = 'other'
Here is a fiddle with this.
The result:
╔════════╦═════════════╦══════════════════╦════════╦═══════╗
║ NAME ║ SERVICE ║ ALIAS ║ NUMBER ║ PRICE ║
╠════════╬═════════════╬══════════════════╬════════╬═══════╣
║ carlos ║ telephone ║ telephone-carlos ║ 6 ║ 700 ║
║ juan ║ watter ║ watter-juan ║ 12 ║ 900 ║
║ maria ║ gas ║ gas-maria ║ 15 ║ 250 ║
║ jhon ║ hostal ║ hostal-jhon ║ 21 ║ 640 ║
║ carlos ║ sleeping ║ sleeping-carlos ║ 24 ║ 300 ║
║ carlos ║ othercarlos ║ (null) ║ 11 ║ 500 ║
║ other ║ (null) ║ (null) ║ 2 ║ 558 ║
╚════════╩═════════════╩══════════════════╩════════╩═══════╝