产品

product_id      name
51                a
52                 b
53                 c
54                 s
55                 e

product_filter

product_id      filter_id
52                 11
51                 22
51                 33
52                 33
54                 11

filter_group_description

filter_group_id     filter_id        name
1                     11             white  
1                     22             black
2                     33             formals
2                     44             casuals

filter_group

filter_group_id      name
1                   Colour
2                   Style

我想要的是产品名称，颜色为黑色或白色，但样式应为正式。

**** ***** UPDATE

我想在此查询中集成查询：



           SELECT DISTINCT oc_product.product_id, oc_product.image, oc_product.name, oc_product_option.option_id, oc_product.price,

            ifnull((SELECT oc_product_special.price
            FROM oc_product_special
            WHERE oc_product_special.product_id = oc_product.product_id
            AND '$date1' between oc_product_special.date_start and oc_product_special.date_end),0) as special_price, 

            ifnull((SELECT DISTINCT avg( oc_review.rating )
            FROM oc_review
            WHERE oc_review.product_id = oc_product.product_id
            GROUP BY oc_product.product_id),0) as rating, 

            ifnull((SELECT DISTINCT count(      
                oc_review.product_id)
            FROM oc_review
            WHERE oc_review.product_id = oc_product.product_id 
            GROUP BY oc_product.product_id),0) as rated 
            FROM oc_product, oc_product_to_category, oc_product_option, oc_review $from 

            where  oc_product_option.product_id = oc_product.product_id
            AND  oc_product_to_category.category_id = $category_id
            AND oc_product_to_category.product_id = oc_product.product_id

SELECT DISTINCT oc_product.product_id, oc_product.image, oc_product.name, oc_product_option.option_id, oc_product.price, ifnull((SELECT oc_product_special.price FROM oc_product_special WHERE oc_product_special.product_id = oc_product.product_id AND '$date1' between oc_product_special.date_start and oc_product_special.date_end),0) as special_price, ifnull((SELECT DISTINCT avg( oc_review.rating ) FROM oc_review WHERE oc_review.product_id = oc_product.product_id GROUP BY oc_product.product_id),0) as rating, ifnull((SELECT DISTINCT count( oc_review.product_id) FROM oc_review WHERE oc_review.product_id = oc_product.product_id GROUP BY oc_product.product_id),0) as rated FROM oc_product, oc_product_to_category, oc_product_option, oc_review $from where oc_product_option.product_id = oc_product.product_id AND oc_product_to_category.category_id = $category_id AND oc_product_to_category.product_id = oc_product.product_id

Answer 1

您可以在HAVING子句中使用条件聚合：

SELECT p.name
FROM product p
JOIN product_filter pf
  ON p.product_id = pf.product_id
JOIN filter_group_description fgd
  ON pf.filter_id = fgd.filter_id
JOIN filter_group fg
  ON fgd.filter_group_id = fg.filter_group_id
GROUP BY p.name
HAVING  MAX(fgd.name = 'white')+MAX(fgd.name = 'black') > 0
    AND MAX(fgd.name = 'formals') = 1

对于像fgd.name = 'white'这样的真/假表达式，MySQL返回0或1，而其他数据库则必须使用MAX(CASE WHEN fgd.name = 'white' THEN 1 END)。

演示：SQL Fiddle

编辑：如果您只想传递颜色列表和样式列表，可以在CASE子句中使用带有IN的{{1}}表达式，这样可以轻松实现使查询动态：

HAVING

动态处理新过滤器组会稍微复杂一些。

Answer 2

SELECT p.name
FROM product p
JOIN
    ( SELECT pf.*,
             fgd.filter_group_id,
             fgd.name 'fgd_name',
             fg.name 'fg_name'
      FROM product_filter pf
      JOIN filter_group_description fgd
      ON pf.filter_id = fgd.filter_id
      JOIN filter_group fg
      ON fgd.filter_group_id = fg.filter_group_id
      WHERE fg.name = 'Colour'
    ) filter1
ON p.product_id = filter1.product_id
JOIN
    ( SELECT pf.*,
             fgd.filter_group_id,
             fgd.name 'fgd_name',
             fg.name 'fg_name'
      FROM product_filter pf
      JOIN filter_group_description fgd
      ON pf.filter_id = fgd.filter_id
      JOIN filter_group fg
      ON fgd.filter_group_id = fg.filter_group_id
      WHERE fg.name = 'Style'
    ) filter2
ON p.product_id = filter2.product_id
WHERE filter1.fgd_name IN
( 'black', 'white' )
      AND filter2.fgd_name = 'formals'

这是一个SQLFiddle：http://sqlfiddle.com/#!9/8ab6e3/1

SQL Query用于比较一列中的多个数据

产品

product_filter

filter_group_description

filter_group

2 个答案: