如何从一张表中选择数据并选择计数到另一张表并在MySQL中组合？

Question

In one fruit there can be multiple tickets that can be raised. I need to display the number of tickets raised per fruit. Their key field is the fruit_id .

Answer 1

If I have the following tables:

fruit

id    name
 1    apple
 2    orange

tickets

id  fruit_id
 1         1
 2         1
 3         2
 4         2
 5         2

Then I would use the following SQL syntax to output a table like the one you need:

SELECT fruit.id, fruit.name, COUNT(tickets.id)
FROM tickets
LEFT JOIN fruit ON fruit.id = tickets.fruit_id
GROUP BY fruit.id;

Output:

id     name   COUNT(tickets.id)
 1    apple                  2
 2   orange                  3

Answer 2

SELECT Fruit.Fruit ID,Fruit.Fruit Name, count(Ticket.Ticket Id) as match_rows FROM Fruit LEFT Join Ticket on (Fruit.Fruit ID = Ticket.Fruit ID) group by Fruit.Fruit Id ORDER BY Fruit.Fruit ID DESC