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Reputation: 87

Mysql Query JOIN Query

I have three tables. Table A has the option name (i.e. Color, Size). Table B has option value name (i.e Blue, Red, Black, Etc.). Table C establishes the relationship by putting option name id and option name value id together in a row.

My query needs to show the names of the values and and options as opposed to the id number. I can do A and B one at a time and get a list of value and options names, but since the value and options are related I want a combined list. For Example.

Color - Blue Color - Red Size - Big Size - Small

So my question is how to join these two queries to get a combined result like above.

SELECT products_options.products_options_name FROM products_options
LEFT JOIN products_options_values_to_products_options ON products_options_values_to_products_options.products_options_id=products_options.products_options_id

SELECT products_options_values.products_options_values_name FROM products_options_values
LEFT JOIN products_options_values_to_products_options ON products_options_values_to_products_options.products_options_values_id=products_options_values.products_options_values_id

Upvotes: 0

Views: 89

Answers (1)

Denis de Bernardy
Denis de Bernardy

Reputation: 78413

You need two joins, which will look like this:

select product_options.product_id,
       option_names.name_id,
       option_names.name,
       option_values.value_id,
       option_values.name
from product_options
join option_names using (option_id)
join option_values using (option_id)
where product_options.product_id = :product_id

It won't combine them together for an immediate insert in your variations table, but this is the best you'll do in MySQL.

Upvotes: 1

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