sql - 如何在 SQL 中显示多个表中的数据

Question

我对 SQL 比较陌生。我试图弄清楚如何满足这个条件：customer_id, customer_last_name, order_id,order_item_id, product_name为居住在弗吉尼亚州的任何客户展示。

到目前为止，我有这个，但我不确定如何一起显示这些值。任何帮助将不胜感激。

SELECT customer_id, cust_first_name
FROM demo_customers
WHERE cust_state= 'VA'

SELECT order_id
FROM demo_orders
WHERE customer_id= '1'

Answer 1

你需要一个JOIN

SELECT customer_id, cust_first_name, order_id, order_item_id, product_name
FROM demo_customers
INNER JOIN demo_orders on demo_orders.customer_id = demo_customers.customer_id
WHERE cust_state= 'VA'