问题
I have an existing scheme for products variations.
I want to create a combination of each production time, quantities and variation options.
I will create a selection form by accessing the quantities, production times, variation and variation options from the product.
table_groups
+------------+
| id | title |
+----+-------+
| 1 | rug |
+----+-------+
table_days
+----+----------+------+
| id | group_id | day |
+----+----------+------+
| 1 | 1 | 1 |
| 2 | 1 | 2 |
| 3 | 1 | 3 |
+----+----------+------+
table_quantities
+----+----------+-----------+
| id | group_id | quantity |
+----+----------+-----------+
| 1 | 1 | 100 |
| 2 | 1 | 200 |
| 3 | 1 | 300 |
| 4 | 1 | 400 |
+----+----------+-----------+
table_attributes
+----+----------+-----------+
| id | group_id | title |
+----+----------+-----------+
| 1 | 1 | Color |
| 2 | 1 | Size |
+----+----------+-----------+
table_attribute_values
+----+----------+--------------+--------+
| id | group_id | attribute_id | title |
+----+----------+--------------+--------+
| 1 | 1 | 1 | Red |
| 2 | 1 | 1 | Yellow |
| 3 | 1 | 1 | Black |
| 4 | 1 | 2 | Small |
| 5 | 1 | 2 | Medium |
+----+----------+--------------+--------+
I prepared an example schema. However, I am not getting the result I want.
SQL Fiddle
This much I did do:
SELECT
GROUP_CONCAT(DISTINCT days_group) as days_list,
GROUP_CONCAT(DISTINCT quantities_group SEPARATOR ',') as quantities_list,
GROUP_CONCAT(DISTINCT attribute_values_group SEPARATOR ',') as attribute_values_list
FROM
table_groups
LEFT JOIN (
SELECT days.day, days.group_id,
GROUP_CONCAT(days.day) as days_group
FROM table_days days GROUP BY days.id
) joindays ON joindays.group_id = table_groups.id
LEFT JOIN (
SELECT quantities.quantity, quantities.group_id,
GROUP_CONCAT(quantities.quantity) as quantities_group
FROM table_quantities quantities GROUP BY quantities.id
) joinquantities ON joinquantities.group_id = table_groups.id
LEFT JOIN table_attributes attributes ON attributes.group_id = table_groups.id
LEFT JOIN (
SELECT attribute_id, group_id,
GROUP_CONCAT(attribute_values.title) as attribute_values_group
FROM table_attribute_values attribute_values
GROUP BY attribute_values.attribute_id, attribute_values.id
) joinattributevalues ON joinattributevalues.attribute_id = attributes.id
GROUP BY joinattributevalues.attribute_id;
Query Results:
+---------------+-----------+-----------------+-----------------------+
| group_id | days_list | quantities_list | attribute_values_list |
+---------------+-----------+-----------------+-----------------------+
| 1 | 1,2,3 | 100,200,300,400 | Red,Yellow,Black |
| 2 | 1,2,3 | 100,200,300,400 | Small,Medium |
+---------------+-----------+-----------------+-----------------------+
The correct result I want should be as follows. Can you help with this?
+-----------+---------------------+--------+
| group_id | combinations | price |
+-----------+---------------------+--------+
| 1 | 1-100-Red-Small | |
+-----------+---------------------+--------+
| 1 | 1-100-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 1-100-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 1-100-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 1-100-Black-Small | |
+-----------+---------------------+--------+
| 1 | 1-100-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 1-200-Red-Small | |
+-----------+---------------------+--------+
| 1 | 1-200-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 1-200-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 1-200-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 1-200-Black-Small | |
+-----------+---------------------+--------+
| 1 | 1-200-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 1-300-Red-Small | |
+-----------+---------------------+--------+
| 1 | 1-300-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 1-300-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 1-300-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 1-300-Black-Small | |
+-----------+---------------------+--------+
| 1 | 1-300-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 1-400-Red-Small | |
+-----------+---------------------+--------+
| 1 | 1-400-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 1-400-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 1-400-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 1-400-Black-Small | |
+-----------+---------------------+--------+
| 1 | 1-400-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 2-100-Red-Small | |
+-----------+---------------------+--------+
| 1 | 2-100-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 2-100-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 2-100-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 2-100-Black-Small | |
+-----------+---------------------+--------+
| 1 | 2-100-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 2-200-Red-Small | |
+-----------+---------------------+--------+
| 1 | 2-200-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 2-200-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 2-200-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 2-200-Black-Small | |
+-----------+---------------------+--------+
| 1 | 2-200-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 2-300-Red-Small | |
+-----------+---------------------+--------+
| 1 | 2-300-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 2-300-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 2-300-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 2-300-Black-Small | |
+-----------+---------------------+--------+
| 1 | 2-300-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 2-400-Red-Small | |
+-----------+---------------------+--------+
| 1 | 2-400-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 2-400-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 2-400-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 2-400-Black-Small | |
+-----------+---------------------+--------+
| 1 | 2-400-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 3-100-Red-Small | |
+-----------+---------------------+--------+
| 1 | 3-100-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 3-100-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 3-100-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 3-100-Black-Small | |
+-----------+---------------------+--------+
| 1 | 3-100-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 3-200-Red-Small | |
+-----------+---------------------+--------+
| 1 | 3-200-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 3-200-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 3-200-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 3-200-Black-Small | |
+-----------+---------------------+--------+
| 1 | 3-200-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 3-300-Red-Small | |
+-----------+---------------------+--------+
| 1 | 3-300-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 3-300-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 3-300-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 3-300-Black-Small | |
+-----------+---------------------+--------+
| 1 | 3-300-Black-Medium | |
+-----------+---------------------+--------+
| 1 | 3-400-Red-Small | |
+-----------+---------------------+--------+
| 1 | 3-400-Red-Medium | |
+-----------+---------------------+--------+
| 1 | 3-400-Yellow-Small | |
+-----------+---------------------+--------+
| 1 | 3-400-Yellow-Medium | |
+-----------+---------------------+--------+
| 1 | 3-400-Black-Small | |
+-----------+---------------------+--------+
| 1 | 3-400-Black-Medium | |
+-----------+---------------------+--------+
Note: There is no limit for the number of groups, attributes, and attributes values. The example result might be something like this:
Attributes:
+-------+------+-------+--------+
| Color | Size | Model | Gender |
+-------+------+-------+--------+
Combinations:
+------------------------------+
| 1-100-Red-Small-Model 1-Male |
+------------------------------+
| 1-100-Red-Small-Model 2-Male |
+------------------------------+
It is not necessary to do it with SQL query. We can also do this with the Laravel Query Builder method.
Thanks in advance for your help.
Check the sample SQL Fiddle
回答1:
This should do it. Will not function in mysql 5.7 because recursive CTEs weren't included until later, but this will allow you to have a variable number of attributes and attribute_values per group_id. The fiddle is here.
with recursive allAtts as (
/* Get our attribute list, and format it if we want; concat(a.title, ':', v.title) looks quite nice */
SELECT
att.group_id,
att.id,
CONCAT(v.title) as attDesc,
dense_rank() over (partition by att.group_id order by att.id) as attRank
FROM table_attributes att
INNER JOIN table_attribute_values v
ON v.group_id = att.group_id
AND v.attribute_id = att.id
),
cte as (
/* Recursively build our attribute list, assuming ranks are sequential and we properly linked our group_ids */
select group_id, id, attDesc, attRank from allAtts WHERE attRank = 1
union all
select
allAtts.group_id,
allAtts.id,
concat_ws('-', cte.attDesc, allAtts.attDesc) as attDesc,
allAtts.attRank
from cte
join allAtts ON allAtts.attRank = cte.attRank +1
AND cte.group_id = allAtts.group_id
)
/* Our actual select statement, which RIGHT JOINs against the table_groups
so we don't lose entries w/o attributes */
select
grp.id,
concat_ws('-', d.day, qty.quantity, cte.attDesc) as combinations
from cte
inner join (select group_id, max(attRank) as attID
from cte
group by group_id) m on cte.group_id = m.group_id and m.attID = cte.attrank
RIGHT JOIN table_groups grp ON grp.id = cte.group_id
LEFT JOIN table_days d on grp.id = d.group_id
LEFT JOIN table_quantities qty on grp.id = qty.group_id;
来源：https://stackoverflow.com/questions/64837507/creating-table-columns-combinations-using-sql-query-or-laravel-sql-query-builder