[英]MySQL ORDER BY Another table's column names
我有一張桌子,上面的物品看起來像這樣:
Product | Color | Size | Size Range ID (from a different, joined table)
-----------------------------------------------------------------------
Shirt | Blue | L | 1
Shirt | Blue | M | 1
Shirt | Blue | S | 1
請注意,尺寸在上表中按字母順序排序。
我還有一個尺寸范圍表,如下所示:
id | size_01 | size_02 | size_03
--------------------------------
1 | S | M | L
如何強制將第一個表上的項目按第二個表中大小的位置排序?
您可以使用join
合並表,然后使用field()
獲得列列表中的位置:
select i.*
from items i left outer join
SizeRange sr
on i.SizeRangeId = sr.SizeRangeId
order by field(i.Size, sr.size_01, sr.size_02, sr.size_03)
SELECT
MAX(CASE Size WHEN 'S' THEN Size ELSE '' END) AS 'size_01',
MAX(CASE Size WHEN 'L' THEN Size ELSE '' END) AS 'size_02',
MAX(CASE Size WHEN 'M' THEN Size ELSE '' END) AS 'size_03'
FROM Test
GROUP BY Product
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