我需要在单独的行上使用逗号分隔的mysql表值

Question

我有两张表格如下

表产品

def my_converter(value: object) -> float:
  # add all your "known" value conversions and fallbacks
  converted_value = float(value)
  return converted_value

df.apply(pd.to_numeric, converter=my_converted)

表类别

-product_id-        -categorie ids-
  1                   2,4,5,6
  2                   1,4,3
  4                    3,5

我需要这种格式的结果

c-category_id-       -(catname)-
  1                  cat1
  2                  cat2
  3                  cat3
  4                  cat4
  5                  cat5
  6                  cat6

Answer 1

SELECT  a.product_id,
        b.catname
FROM    products a
        INNER JOIN category b
            ON FIND_IN_SET(b.category_id, a.categorie_ids) > 0
            ORDER BY a.product_id

现场演示

  

http://sqlfiddle.com/#!9/02efca/5