Php mysql按方法分组
采购表:Php mysql按方法分组,php,mysql,Php,Mysql,采购表: ======================== id|username|product|price| 01|Desmond |tv |$40 | 02|Desmond |watch |$20 | 03|Desmond |ring |$30 | 04|Desmond |laptop |$40 | ======================== 产品表: ============================ id|product|type |promotio
========================
id|username|product|price|
01|Desmond |tv |$40 |
02|Desmond |watch |$20 |
03|Desmond |ring |$30 |
04|Desmond |laptop |$40 |
========================
产品表:
============================
id|product|type |promotion_ID|
01|tv |big |001 |
02|watch |small|002 |
03|ring |small|002 |
04|laptop |big |001 |
============================
推广编号:
==============================
id|promotion_ID|promotion_name|
01|001 |mid-year |
02|002 |end-year |
==============================
我想基于while循环方法显示Purchase表的结果,以显示mysql中的所有信息,这是没有问题的,但是我想根据Purchase表对它们进行分组,根据它们的促销id/促销名称。我可以知道吗,我该怎么办
例如。
显示结果:
年中
=======================
username|product|price|
Desmond |tv |$40 |
Desmond |laptop |$40 |
=======================
年底
=======================
username|product|price|
Desmond |watch |$20 |
Desmond |ring |$30 |
=======================
您是否正在查找按订购的
和加入
:
SELECT promotion_name,
username,
p.product,
price
FROM Purchase P
JOIN Product PR ON P.Product=PR.Product
JOIN Promotion PO ON PR.Promotion_Id=PO.Promotion_Id
ORDER BY promotion_name, p.product
关于您的数据库,我不建议将产品存储在购买表中——您应该存储产品Id。试试看
This may help you..
Select username,product,price from Purchase
Join Product on Product.product = Purchase.product
Join Promotion On promotion.promotion_ID = Product.promotion_ID
where promotion_name = 'mid-year' // pass your argument
Order by Product.product
注意:您没有在所有表中引用主键,因此请在所有表的
product
列和promotion\u id列上创建索引。到目前为止,您做了哪些尝试?感谢大家的帮助,以另一种方式获得了预期的结果。。再次感谢您提供的帮助。。
SELECT pur.username, pur.product, pur.price
FROM tbl_purchase pur
INNER JOIN tbl_product pro USING(product)
INNER JOIN tbl_promotion prm USING(promotion_ID)
ORDER BY prm.promotion_name