Question

我有一个看起来像这样的查询

SELECT
 producttemp.*,
 GROUP_CONCAT(colors.id) as color,
 GROUP_CONCAT(DISTINCT upc.UPC) as upc
FROM producttemp
INNER JOIN productcolor
 ON productcolor.productid=producttemp.id
INNER JOIN upc
 ON upc.productid=producttemp.id
INNER JOIN colors
 ON colors.id=productcolor.colorid
INNER JOIN categorie
 ON categorie.id = producttemp.productcategorie
GROUP BY producttemp.id
LIMIT 5

出于某种原因或者说，我进入了结果字段＆＃34; color＆＃34;重复值，即＆＃34; 1,2,1,2＆＃34;。为什么DISTINCT不能用于连接的行？有没有机会解决或者我错过了一点？

Answer 1

在DISTINCT ::

上尝试colors.id

SELECT
 producttemp.*,
 GROUP_CONCAT(DISTINCT colors.id) as color,
 GROUP_CONCAT(DISTINCT upc.UPC) as upc
FROM producttemp
INNER JOIN productcolor
 ON productcolor.productid=producttemp.id
INNER JOIN upc
 ON upc.productid=producttemp.id
INNER JOIN colors
 ON colors.id=productcolor.colorid
INNER JOIN categorie
 ON categorie.id = producttemp.productcategorie
GROUP BY producttemp.id
LIMIT 5

连接行上的mysql GROUP_CONCAT DISTINCT

1 个答案: