Inner Join and show value - mysql

Question

I have two tables in my MySQL database:
table_bookings:
id - bookings
1 - 1
2 - 1,2,3
3 - 2,3
table_services:
id - name
1 - Facial
2 - Corporal
3 - Others
I need to make a query to get the following result:
id - services_id - services_name
1 - 1 - Facial
2 - 1,2,3 - Facial, Corporal, Others
3 - 2,3 - Corporal, Others

Answer 1

First Change your table layout to something like this:
table_bookings:
id | booking
1 | 1
2 | 1
2 | 2
2 | 3
3 | 2
3 | 2
After that you can join this table by booking-id to the Translation:
SELECT * FROM table_bookings AS a JOIN table_services AS b ON a.booking = b.id
If you Play around with GROUP_CONCAT after that you should get your desired result.

Answer 2

It looks like you need to join table table_bookings to table table_services to combine information from both tables in the result.
To join the two tables, you need to join them on a matching column. In other words, there needs to be a column in both tables which essentially represents the same thing -- then you can join using this column.
It looks like column bookings in table_bookings corresponds to id in table_services so you should join on these columns.

Answer 3

Consider normalize data. This can be done with these queries from existing data:
CREATE TABLE booking_services AS
SELECT DISTINCT b.id AS booking_id, s.id AS service_id
FROM table_bookings b
INNER JOIN table_services s ON FIND_IN_SET(s.id, b.bookings) > 0;
ALTER TABLE booking_services
ADD PRIMARY KEY (booking_id, service_id);
After normalization your query can be this:
SELECT
bs.booking_id,
GROUP_CONCAT(bs.service_id ORDER BY bs.service_id) AS services_id,
GROUP_CONCAT(s.name ORDER BY bs.service_id SEPARATOR ', ') AS services_name
FROM
booking_services bs
INNER JOIN
table_services s ON s.id = bs.service_id
GROUP BY bs.booking_id
Yes, you can write query on non normalized data:
SELECT
b.id,
b.bookings AS services_id,
GROUP_CONCAT(s.name ORDER BY s.id SEPARATOR ', ') AS services_name
FROM
table_bookings b
INNER JOIN
table_services s ON FIND_IN_SET(s.id, b.bookings) > 0
GROUP BY b.id, b.bookings
But on large data sets query on normalized data performs faster - see execution plans (See EXPLAIN syntax).
Test both queries on SQL Fiddle
Documentation:
Database normalization
CREATE TABLE ... SELECT Syntax
ALTER TABLE Syntax
FIND_IN_SET(str,strlist)
GROUP_CONCAT(expr)