MySQL查詢按國家排名客戶

Question

我的目標非常簡單：我想根據國家的預訂數量按國家排列我的客戶。

---

這裏我表：

___BillableDatas

|--------|---------------|------------|----------| 
| BIL_Id | BIL_BookingId | BIL_Date | BIL_Type | 
|--------|---------------|------------|----------| 
| 1  | 90   | 2017-05-04 | Night | 
| 2  | 90   | 2017-05-05 | Night | 
| 3  | 90   | 2017-05-06 | Night | 
| 4  | 91   | 2017-05-14 | Night | 
| 5  | 92   | 2017-05-20 | Night | 
| 6  | 93   | 2017-05-28 | Night | 
|--------|---------------|------------|----------| 

___Bookings

|--------|--------------| 
| BOO_Id | BOO_ClientId | 
|--------|--------------| 
| 90  | 30   | 
| 91  | 31   | 
| 92  | 32   | 
| 93  | 33   | 
|--------|--------------| 

___Kardex

|--------|---------------------------| 
| KDX_Id | KDX_PostalAddress_Country | 
|--------|---------------------------| 
| 30  | FR      | 
| 31  | CA      | 
| 32  | CA      | 
| 33  | ES      | 
|--------|---------------------------| 

___CountryList

|----------|---------| 
| CTY_Code | CTY_en | 
|----------|---------| 
| FR  | France | 
| CA  | Canada | 
| ES  | Spain | 
|----------|---------| 

---

我想類似的東西爲2017-05-01之間的期間2017-05-30：

|------|---------|----------|-----------|------------|-------------| 
| Rank | Country | night_nb | night_pct | booking_nb | booking_pct | 
|------|---------|----------|-----------|------------|-------------| 
| 1 | Canada | 2  | 33.33  | 2   | 50   | 
| 2 | France | 3  | 50.00  | 1   | 25   | 
| 3 | Espagne | 1  | 16.66  | 1   | 25   | 
|------|---------|----------|-----------|------------|-------------| 

---

這裏我試圖代碼：

SELECT CTY_Code, CTY_en 
    , night_nb 
    , 100*night_nb/@sum_night_nb AS night_pct 
    , booking_nb 
    , 100*booking_nb/@sum_booking_nb AS booking_pct 
FROM  (
    SELECT  CTY_Code, CTY_en 
       , @sum_night_nb := count(BIL_Id) night_nb 
       , @sum_booking_nb := count(distinct BIL_BookingId) booking_nb 
    FROM  ___CountryList cty 
    INNER JOIN ___Kardex kdx 
      ON KDX_PostalAddress_Country = CTY_Code 
    LEFT JOIN (___Bookings boo 
    INNER JOIN ___BillableDatas bil 
      ON BIL_BookingId = BOO_Id 
      AND BIL_Type = "Night") 
      ON KDX_Id = BOO_ClientId 
      AND BIL_Date between "2017-05-01" AND "2017-05-30" 
    GROUP BY CTY_en with rollup 
    ) base 
WHERE CTY_en is not null 
ORDER BY booking_nb DESC 
, CTY_en ASC 

Answer 1

你可以在外部查詢中添加一個變量行號

SELECT 
    (@row := ifnull(@row, 0) + 1) as row_number 
    , CTY_en 
    , night_nb 
    , 100*night_nb/@sum_night_nb AS night_pct 
    , booking_nb 
    , 100*booking_nb/@sum_booking_nb AS booking_pct 
FROM  (
    SELECT  CTY_Code, CTY_en 
       , @sum_night_nb := count(BIL_Id) night_nb 
       , @sum_booking_nb := count(distinct BIL_BookingId) booking_nb 
    FROM  ___CountryList cty 
    JOIN ___Kardex kdx 
     ON KDX_PostalAddress_Country = CTY_Code 
    LEFT JOIN (
     ___Bookings boo 
     JOIN ___BillableDatas bil 
      ON (BIL_BookingId = BOO_Id AND BIL_Type = "Night") 
    ) 
    ON (KDX_Id = BOO_ClientId AND BIL_Date between "2017-05-01" AND "2017-05-30") 
    GROUP BY CTY_en with rollup 
    ) base 
JOIN (select @row := 0) r 
WHERE CTY_en is not null 
ORDER BY booking_nb DESC, CTY_en ASC; 

測試數據：

drop table if exists ___BillableDatas; 
drop table if exists ___Bookings; 
drop table if exists ___Kardex; 
drop table if exists ___CountryList; 

create table ___BillableDatas (BIL_Id int, BIL_BookingId int,BIL_Date date, BIL_Type varchar(30)); 
insert into ___BillableDatas (BIL_Id, BIL_BookingId, BIL_Date, BIL_Type) values 
(1,90,'2017-05-04','Night'),(2,90,'2017-05-05','Night'), 
(3,90,'2017-05-06','Night'),(4,91,'2017-05-14','Night'), 
(5,92,'2017-05-20','Night'),(6,93,'2017-05-28','Night'); 

create table ___Bookings (BOO_Id int, BOO_ClientId int); 
insert into ___Bookings (BOO_Id, BOO_ClientId) values 
(90,30),(91,31),(92,32),(93,33); 

create table ___Kardex (KDX_Id int, KDX_PostalAddress_Country char(2)); 
insert into ___Kardex (KDX_Id, KDX_PostalAddress_Country) values 
(30,'FR'),(31,'CA'),(32,'CA'),(33,'ES'); 

create table ___CountryList (CTY_Code char(2), CTY_en varchar(30)); 
insert into ___CountryList (CTY_Code, CTY_en) values 
('FR','France'),('CA','Canada'),('ES','Spain');