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在包含兩個表的記錄的交叉表的單個查詢中選擇三個記錄-MYSQL

[英]Select three records in a single query of a cross table that contains records of two tables - MYSQL

我有一個稱為"product"的主表,該主表與三個表鏈接:

"product_type", 
"feature", 
"type_feature" 

還有一個稱為"product_feature"的交叉表,其中包含同一產品的多個功能。

示例一記錄:

我有類似的東西:

產品類別

id_product_type    name
    1              Phone

特征

id_feature   name
    1         Memory 
    2         Color 
    3         Memory Ram

FEATURE_TYPE

id_feature_type  id_feature  value
      1              1         16GB
      2              1         32GB
      3              2         Blue
      4              2         Black
      5              3         2GB
      6              3         3GB  

產品

id_product id_product_type  price quantity  model
    1           1           100$    5      Moto-G7 

交叉表“ product_feature”(鏈接到“ product”,“ feature”和“ feature_type”):

id_feature id_product id_feature_type
    1          1            1
    2          1            3
    3          1            6

我想查詢顯示此:

id_product   type_name price quantity   model    feature_name  value  
    1        Phone     100$     5      Moto-G7     Memory       16GB
feature_name2 value2  feature_name3   value3
    Color      Blue    Memory Ram       3GB

我試過了,但是只有我只有一個feature_name和value,我需要三個:

  SELECT p.id_product, pt.name, model, price, quantity, f.name AS feature, ft.value
  FROM product p
  LEFT JOIN product_type pt ON pt.id_product_type = p.id_product_type 
  LEFT JOIN product_feature pf ON pf.id_product = p.id_product
  LEFT JOIN feature f ON f.id_feature = pf.id_feature
  LEFT JOIN feature_type ft ON ft.id_feature_type = pf.id_feature_type
  GROUP BY p.id_product;

試試這個查詢,它將為您提供結果:

SELECT product.*, product_type.name as TypeName, (SELECT CONCAT( GROUP_CONCAT(feature_type.value), "|", GROUP_CONCAT(feature.name) ) FROM `product_feature` INNER JOIN feature_type on product_feature.id_feature_type = feature_type.id_feature_type INNER JOIN feature on feature_type.id_feature = feature.id_feature WHERE product_feature.id_product=1 GROUP BY product_feature.id_product) as options FROM `product` LEFT JOIN product_type on product.id_product_type = product_type.id_product_type

在此處輸入圖片說明

您將獲得產品的選項,並且必須通過“ |”將這些選項炸開()。 並且您可以通過使用$ count = count(explode(“ |”,$ options))來計數您擁有多少個選項

通過這種方式,您可以獲得所有選擇。

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