SQL：推導基於輸入值

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表交易：business_key = CUSTOMER_IDSQL：推導基於輸入值

 
customer_id|product_type|amount 
------------------------------- 
cus1  | shoes  | 100 
cus1  | shoes  | 50 
cus1  | clothes | 100 
cus2  | clothes | 500 
cus2  |clothes  | 21

表transactionsbycustomer：business_key = CUSTOMER_ID + PRODUCT_TYPE

 
customer_id|product_type|amount 
------------------------------- 
cus1  |shoes  |150 
cus1  |clothes  | 50 
cus2  |clothes  |521

我需要「transactionsbycustomer導出用於量值'表使用SQL？請幫忙！

來源

2014-07-08 user3816460

你的意思是這樣的：'SELECT amount FROM transactionsbycustomer WHERE customer_id =「cus1」';？你特別需要什麼？ – JiFus

請根據樣本數據添加預期輸出示例。 –

我想你正在考慮'GROUP BY'子句。 – mustaccio

這是非常基本的SQL。

SELECT customer_id, product_id, sum(amount) as total 
FROM transactionsbycustomers 
GROUP BY customer_id, product_id

來源

2014-07-08 14:17:48 Charles

SQL：推導基於輸入值

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