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[英]SELECT DISTINCT TWO COLUMNS and SUM another COLUMN's VALUES
[英]select columns' values based on another two values from another column
我有此數據集,我需要根據列值提取多個列值。
為了詳細說明就可以了,我有一個rental
表, inventory
表, customer
表,我想涉及customer
表, rental
由表customer_id
並涉及rental
表, inventory
由表inventory_id
,最終的目的是產生first_name
和last_name
客戶指定的customer_id
。
通過
SELECT *
FROM (
SELECT
inventory.inventory_id,inventory.store_id,
rental.customer_id,customer.first_name,customer.last_name
FROM inventory
INNER JOIN rental ON inventory.inventory_id=rental.inventory_id
INNER JOIN customer ON rental.customer_id=customer.customer_id
WHERE inventory.film_id='25') AS data
;
我已經達到了
inventory_id | store_id | customer_id | first_name | last_name
--------------+----------+-------------+------------+-----------
124 | 1 | 265 | Jennie | Terry
124 | 1 | 497 | Gilbert | Sledge
124 | 1 | 158 | Veronica | Stone
125 | 1 | 377 | Howard | Fortner
125 | 1 | 163 | Cathy | Spencer
125 | 1 | 141 | Debbie | Reyes
125 | 1 | 558 | Jimmie | Eggleston
126 | 1 | 327 | Larry | Thrasher
126 | 1 | 147 | Joanne | Robertson
126 | 1 | 225 | Arlene | Harvey
126 | 1 | 393 | Philip | Causey
126 | 1 | 425 | Francis | Sikes
127 | 1 | 336 | Joshua | Mark
127 | 1 | 350 | Juan | Fraley
128 | 2 | 96 | Diana | Alexander
128 | 2 | 273 | Priscilla | Lowe
128 | 2 | 163 | Cathy | Spencer
129 | 2 | 498 | Gene | Sanborn
129 | 2 | 360 | Ralph | Madrigal
129 | 2 | 292 | Misty | Lambert
129 | 2 | 578 | Willard | Lumpkin
129 | 2 | 53 | Heather | Morris
但是,我想進一步采取措施以獲得下表
inventory_id | store_id | customer_id | first_name | last_name
--------------+----------+-------------+------------+-----------
124 | 1 | 265 | Jennie | Terry
126 | 2 | 265 | Jennie | Terry
125 | 1 | 163 | Cathy | Spencer
128 | 2 | 163 | Cathy | Spencer
通過檢查store_id='1'
和store_id='2'
的customer_id
的出現來獲取列值customer_id
, first_name
和last_name
。 我知道我需要做COUNT (DISTINCT customer_id)
但我不知道如何申請才能實現。 任何幫助將不勝感激!
您在尋找兩家商店的顧客嗎? exists
一種方法:
with t as (
SELECT i.inventory_id, i.store_id,
r.customer_id, c.first_name, c.last_name
FROM inventory i JOIN
rental r
ON i.inventory_id = r.inventory_id JOIN
customer c
ON r.customer_id = c.customer_id
WHERE i.film_id = 25
)
select t.*
from t
where t.store_id in ( 1, 2) and
exists (select 1
from t t2
where t2.customer_id = t.customer_id and
t2.store_id in (1, 2) and
t2.store_id <> t.store_id
);
但是,如果只希望在兩個商店都購買過的客戶,則可以使用以下簡單查詢:
SELECT r.customer_id, c.first_name, c.last_name
FROM inventory i JOIN
rental r
ON i.inventory_id = r.inventory_id JOIN
customer c
ON r.customer_id = c.customer_id
WHERE i.film_id = 25 AND
r.store_id in (1, 2)
GROUP BY r.customer_id, c.first_name, c.last_name
HAVING COUNT(DISTINCT r.store_id) = 2;
您可以在下面嘗試-
SELECT
inventory.inventory_id,inventory.store_id,
rental.customer_id,customer.first_name,customer.last_name
FROM inventory
INNER JOIN rental ON inventory.inventory_id=rental.inventory_id
INNER JOIN customer ON rental.customer_id=customer.customer_id
WHERE inventory.film_id='25' and inventory.store_id in (1,2)
group by nventory.inventory_id,inventory.store_id,
rental.customer_id,customer.first_name,customer.last_name
having count(distinct inventory.store_id)=2
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