php - 在选择查询中使用选择查询？

Question

I am trying to use a select query within another select query in the from clause.This is a mysql query.

SELECT invoiceNo, SUM(weight), COUNT(barcode), sum_total
FROM (SELECT * FROM `selected_items` WHERE date LIKE '07-Jan-2016' ORDER BY id DESC)
WHERE date LIKE '07-Jan-2016' GROUP BY invoiceNo;

This is how my database looks like. How can I achieve something like this where I have a table which I order by id desc and use another select query on the result of this query.The above query gives me an error #1248 - Every derived table must have its own alias.Can anyone help I am new to programming.

Answer 1

希望对您有所帮助。

SELECT invoiceNo, SUM( weight ) , COUNT( barcode ) , sum_total
FROM (SELECT * FROM  `selected_items` 
WHERE DATE LIKE  '07-Jan-2016'
ORDER BY id DESC
)a
GROUP BY invoiceNo;