[英]How to join two tables that are joined together with two other tables each
[英]How can two tables be joined together to create a JSON | PHP
我有兩個表Table1
和Table2
。
Table1
包含用戶和他們購買的產品的記錄。
Table2
中包含的一個列表products
中提到的Table1
與他們的price
上面說明的表格示例:
我想將這兩個表連接到一個查詢中,該查詢采用每個用戶進行的所有購買的所有總和的總和並顯示,而不是創建如下所示的JSON:
[{"user":"Jack","sumValue":"4.50"},
{"user":"Jake","sumValue":" 4.00 "},{"user":"Mary","sumValue":" 8.50 "}]
我了解如何創建JSON數組,但不了解如何編寫SQL
$sql = " What I am missing ";
if ($result = mysqli_query($con, $sql))
SELECT User, SUM(Price) as sumValue
FROM Table1
LEFT JOIN Table2 USING(Product)
GROUP BY User
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