Question

I have two tables – countries, tours.

countries has fields (id),(name),(order)

tours has fields (id),(id_country)…

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I need to get the whole list of id and name from table countries ordered by their order, and the count of records in table tours, where tours.id_country = countries.id countries.

Ie, i need to get such list

id   name      count_of_tours
1    France    15
2    England   22
.............................

Is it possible to do in one query?

Thanks much

Answer 1

SELECT C.id,
       C.name,
       COUNT(T.id) as count_of_tours
  FROM countries C
  LEFT JOIN tours T
         ON T.id_country = C.id
 GROUP BY C.id,
          C.name
 ORDER BY C.order