SQL 2 列中的一列有两个结果

Question

我已经在论坛中检查了一些类似的问题，但我似乎无法让它正常工作。我在 phpmyadmin

我需要得到这样的结果：

参考 |产品名称English |产品名称法语

阻止我的是在同一列上执行 2 个请求 (pl.name) :/

这是我现在的查询：

SELECT
p.reference AS Reference,

(SELECT pl.name
FROM ps_product p
LEFT JOIN ps_product_lang pl ON (p.id_product = pl.id_product)
WHERE p.active = 1
AND pl.id_lang = 2) AS ENname,

(SELECT pl.name
FROM ps_product p
LEFT JOIN ps_product_lang pl ON (p.id_product = pl.id_product)
WHERE p.active = 1
AND pl.id_lang = 1) AS FRname

FROM ps_product p

Answer 1

您不需要在子查询中加入：

SELECT p.reference AS Reference,
       (SELECT pl.name
        FROM ps_product_lang pl 
        WHERE p.id_product = pl.id_product AND
              p.active = 1 AND
              pl.id_lang = 2
       ) AS ENname,
       (SELECT pl.name
        FROM ps_product_lang pl 
        WHERE p.id_product = pl.id_product AND
              p.active = 1 AND
              pl.id_lang = 1
       ) AS FRname
FROM ps_product p;

这假定只有一行与子查询匹配。如果不是这种情况，您可能需要将结果限制为单行。

Answer 2

SELECT
  p.reference AS Reference,
  pl.name as ENname,
  pf.name as FRname
FROM ps_product p
LEFT JOIN ps_product_lang pl ON (p.id_product = pl.id_product and pl.id_lang = 1)
LEFT JOIN ps_product_lang pf ON (p.id_product = pf.id_product and pf.id_lang = 2)
WHERE p.active = 1

我可能已经切换了英语和法语，但这应该很容易解决....

SQL 2 列中的一列有两个结果

SQL Two result from one column in 2 columns

sql

phpmyadmin

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