I have a normalized database and I'm trying to return data from multiple tables using JOINs and GROUP_CONCAT.
Problem: Rows are being duplicated with GROUP_CONCAT. I can't use DISTINCT because some of the data (ingredient mfr) does need to be duplicated.
Here is my current query and db structure (SQL Fiddle):
SELECT recipe.*,
GROUP_CONCAT(recipe_detail.ingredient_id) AS iid,
GROUP_CONCAT(ingredient.name) AS iname,
GROUP_CONCAT(ingredient_mfr.abbr) AS mabbr,
GROUP_CONCAT(recipe_tag.name) AS tag
FROM recipe
LEFT JOIN recipe_detail
ON recipe.id = recipe_detail.recipe_id
LEFT JOIN ingredient
ON recipe_detail.ingredient_id = ingredient.id
LEFT JOIN ingredient_mfr
ON ingredient.mfr_id = ingredient_mfr.id
LEFT JOIN recipe_tagmap
ON recipe.id = recipe_tagmap.recipe_id
LEFT JOIN recipe_tag
ON recipe_tagmap.tag_id = recipe_tag.id
WHERE recipe.user_id = 1
GROUP BY recipe.id
recipe
+------------+------------+-----------+
| id | name | user_id |
+============+============+===========+
| 1 | Test123 | 1 |
+------------+------------+-----------+
| 2 | Test456 | 1 |
+------------+------------+-----------+
| 3 | Test789 | 1 |
+------------+------------+-----------+
recipe_detail
+------------+---------------+
| recipe_id | ingredient_id |
+============+===============+
| 1 | 193 |
+------------+---------------+
| 1 | 194 |
+------------+---------------+
| 2 | 16 |
+------------+---------------+
| 3 | 277 |
+------------+---------------+
ingredient
+------------+---------------+---------+
| id | name | mfr_id |
+============+===============+=========+
| 16 | Gin | 4 |
+------------+---------------+---------+
| 193 | Fig | 3 |
+------------+---------------+---------+
| 194 | Tea | 3 |
+------------+---------------+---------+
| 277 | Nut | 2 |
+------------+---------------+---------+
ingredient_mfr
+------------+------------+
| id | abbr |
+============+============+
| 2 | TFA |
+------------+------------+
| 3 | FA |
+------------+------------+
| 4 | LOR |
+------------+------------+
recipe_tag
+------------+------------+
| id | name |
+============+============+
| 1 | one |
+------------+------------+
| 2 | two |
+------------+------------+
| 3 | three |
+------------+------------+
| 4 | four |
+------------+------------+
| 5 | five |
+------------+------------+
| 6 | six |
+------------+------------+
| 7 | seven |
+------------+------------+
| 8 | eight |
+------------+------------+
| 9 | nine |
+------------+------------+
recipe_tagmap
+------------+---------------+---------+
| id | recipe_id | tag_id |
+============+===============+=========+
| 1 | 1 | 1 |
+------------+---------------+---------+
| 2 | 1 | 2 |
+------------+---------------+---------+
| 3 | 1 | 3 |
+------------+---------------+---------+
| 4 | 2 | 4 |
+------------+---------------+---------+
| 5 | 2 | 5 |
+------------+---------------+---------+
| 6 | 2 | 6 |
+------------+---------------+---------+
| 7 | 3 | 7 |
+------------+---------------+---------+
| 8 | 3 | 8 |
+------------+---------------+---------+
| 9 | 3 | 9 |
+------------+---------------+---------+
With my current query, my results look like this:
+------+---------+--------------+----------- ----+---------------+------------------+
| id | name | iid | iname | mabbr | tag |
+======+=========+==============+================+===============+==================+
| 1 | Test123 | 193,193,193, | Fig, Fig, Fig, | FA, FA, FA, | one, two, three, |
| | | 194,194,194 | Tea, Tea, Tea | FA, FA, FA | one, two, three |
+------+---------+--------------+----------------+---------------+------------------+
| 2 | Test456 | 16,16,16 | Gin, Gin, Gin | LOR, LOR, LOR | four, five six |
+------+---------+--------------+----------------+---------------+------------------+
| 3 | Test789 | 277,277,277 | Nut, Nut, Nut | TFA, TFA, TFA | seven,eight,nine |
+------+---------+--------------+----------------+---------------+------------------+
What I would like my results to look like:
+------+---------+--------------+----------- ----+---------------+------------------+
| id | name | iid | iname | mabbr | tag |
+======+=========+==============+================+===============+==================+
| 1 | Test123 | 193, 194 | Fig, Tea | FA, FA | one, two, three, |
+------+---------+--------------+----------------+---------------+------------------+
| 2 | Test456 | 16 | Gin | LOR | four, five six |
+------+---------+--------------+----------------+---------------+------------------+
| 3 | Test789 | 277 | Nut | TFA | seven,eight,nine |
+------+---------+--------------+----------------+---------------+------------------+
As you can see, the presence of multiple tags causes the ingredient data to duplicate. The presence of multiple ingredients causes the tags to duplicate. I have tried to use DISTINCT, but sometimes I will have multiple ingredients and each one of those will return it's own "mabbr", which may be the same it's other ingredient (see first row of expected results). Using DISTINCT, it will only return one instance of that "mabbr".
Is there a change I can make to my query to achieve what I'd like to do?
You can resolve this by extracting the tag grouping to its own subquery:
SELECT
recipe.*,
GROUP_CONCAT(recipe_detail.ingredient_id) AS iid,
GROUP_CONCAT(ingredient.name) AS iname,
GROUP_CONCAT(ingredient_mfr.abbr) AS mabbr,
(
SELECT GROUP_CONCAT(recipe_tag.name)
FROM recipe_tag
INNER JOIN recipe_tagmap
ON recipe_tagmap.tag_id = recipe_tag.id
WHERE recipe_tagmap.recipe_id = recipe.id
) AS tag
FROM recipe
LEFT JOIN recipe_detail
ON recipe.id = recipe_detail.recipe_id
LEFT JOIN ingredient
ON recipe_detail.ingredient_id = ingredient.id
LEFT JOIN ingredient_mfr
ON ingredient.mfr_id = ingredient_mfr.id
WHERE recipe.user_id = 1
GROUP BY recipe.id
(example fiddle)
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