MySQL select 来自一个表的行，第二个表中有多行，并在所选行中获取多行数组

Question

i have one table containing "Client" information, and another including "Tickets" information for each client.

int-------| varchar -------| varchar
client_id | client_name    | client_tickets
----------+----------------+--------------
1         | Title one      | 1,2
2         | Title two      | 2,3

Simplified tickets table

int--------| varchar -------| varchar
ticket_id  | ticket_name | ticket_price
-----------+-------------+--------------
1          | ticketone   | 30  
2          | tickettwo   | 40   
3          | ticketthree | 50  
4          | ticketfour  | 60   
5          | ticketfive  | 70 

With the above two tables, I want to produce a single table with a single query with all the pertinent information to generate a search grid So as to give the following output:

client_id | client_name    | client_tickets | ticket_names          | ticket_prices
----------+----------------+----------------+-----------------------+--
1         | Title one      | 1,2            | ticketone,tickettwo   | 30,40
2         | Title two      | 2,3            | tickettwo,ticketthree | 40,50

ticket_names,ticket_ids,client_name are varchar

I want to receive the final 5 columns with one request for example:

SELECT s.*,
(SELECT GROUP_CONCAT(ticket_name SEPARATOR ',') FROM tickets_table WHERE ticket_id IN(s.client_tickets)) AS ticket_names, 
(SELECT GROUP_CONCAT(ticket_price SEPARATOR ',') FROM tickets_table WHERE ticket_id IN(s.client_tickets)) AS ticket_prices 
FROM client_table s where s.client_id=1

Which seems to have a problem Do you have a better suggestion?

Please make your suggestions

Answer 1

What you want a fairly straightforward SELECT query with some LEFT/INNER JOIN (s).

This website has some good examples/explanations which seem very close to your need: https://www.mysqltutorial.org/mysql-inner-join.aspx

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I would give you a quick working example, but it is not really clear to me what datatype the relevant columns are. Both tables' _id -columns are likely some variant of INTEGER, are they also both primary keys (or otherwise atleast indexed?), the client_name / ticket_name are likely VARCHAR/TEXT/STRING types, but how exactly is the remaining column stored? as json or array or? (+details)

Also you tagged your post with PHP , are you just after the SQL query? or looking for PHP code with the SQL inside it.

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Also, a minor recommendation. If you're just starting out making whatever you're building, and aren't married to these specifics yet.

If you're using an array or json to store those client_tickets , and you're not ALSO using that JSON to store a ton of other info that you've left out here, then i would recommend not using json for this.

A simple junction table would be a far more natural way to store such relationships, and easier to manage with SQL.

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