从起始值开始的MySQL顺序 [英] MySQL Order from a starting value
问题描述
在产品页面上，我有一个下拉列表，列出了与产品页面关联的当前颜色选项.
On a product page I have a dropdown that lists current colour options associated to product page.
在此示例中，产品页面的SKU为250E，可在以下位置使用:
In this example, the product page SKU is 250E and it available in:
GREEN
BLACK
如果客户选择GREEN，那么我想运行一个MySQL命令，该命令将根据下面显示的custom_order值将数据更改为首先显示GREEN值.
If the customer selects GREEN, then I want to run a MySQL command that will change the data to show GREEN values first based in the custom_order value shown below.
起始值应覆盖其他数据项，然后应保留custom_order值. custom_order字段的字母类似c1，c2(它们将始终在底部)
The start value should overide the other data items and then it should retain custom_order values. The custom_order field has letters like c1, c2 (they will always be at the bottom)
Colour Table
============
ID COLOURID NAME
-------------------------------------
2 5 BLACK
3 6 GREEN
Product Table
=============
ID SKU PICTURE URL COLOURID CUSTOM_ORDER
-----------------------------------------------------------------
22 250E cdn_hash_1.jpg 5 1
23 250E cdn_hash_2.jpg 5 2
24 250E cdn_hash_3.jpg 5 3
225 250E cdn_hash_4.jpg 5 4
226 250E cdn_hash_5.jpg 6 5
227 250E cdn_hash_6.jpg 6 6
325 250E cdn_hash_c1.jpg - c1
426 250E cdn_hash_c2.jpg - c2
527 250E cdn_hash_c3.jpg - c3
选择*从按custom_order DESC排序的产品中
现在，我要执行以下操作:
Now, I want to do the following:
选择*从按custom_order和START VALUE ='6'排序的产品中
因此，无论如何，c1，c2保持不变，结果将是:
Therefore, no matter what, the c1, c2 remain intact, result would be:
22 250E cdn_hash_5.jpg 6 5
23 250E cdn_hash_6.jpg 6 6
24 250E cdn_hash_1.jpg 5 1
225 250E cdn_hash_2.jpg 5 2
226 250E cdn_hash_3.jpg 5 3
227 250E cdn_hash_4.jpg 5 4
325 250E cdn_hash_c1.jpg - c1
426 250E cdn_hash_c2.jpg - c2
527 250E cdn_hash_c3.jpg - c3
推荐答案
这是我一直在寻找的答案.我希望我不会为此而感到沮丧，但我设法解决了这个问题.
This is the answer I was looking for. I hope I am not downvoted for this but I managed to resolve this.
让我再次解释一些更简单的术语. MySQL ORDER BY +开始于..
Let me explain again simpler terms. MySQL ORDER BY + Start with..
MySQL:
id | name |
------------
1 | Joe |
2 | Craig |
3 | Shawn |
4 | Ryan |
5 | Seth |
PHP:
$a = mysql_query("SELECT * FROM table_name ORDER BY name DESC");
我想做的是，我想从id:3开始，所以它应该输出:
what I want to do though is, I want to start at id: 3, so it should output:
3,4,5,1,2
解决方案1
SELECT id, name
FROM table_name
ORDER BY id < 3, id
结果:
3 Shawn
4 Ryan
5 Seth
1 Joe
2 Craig
解决方案2
您可以使用FIELD，例如
SELECT *
FROM products
ORDER BY FIELD(`order`, 6) ASC
这篇关于从起始值开始的MySQL顺序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
