mysql - Combining two tables in a complex way -

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the situation:

i have main table, lets call maintable.

+---------+----------+----------+----------+  |  id (pk)| title    | text     | type     | +---------+----------+----------+----------+  |   1     | text|more stuff|        |  |   2     |  | example  | b        |  +---------+----------+----------+----------+

and have second table called translationstable, in id field representation of maintable row id (no foreign key, can refering different tables), objtype objecttype (same name table), fieldname name of field objectype , value has translation value fieldname value in objtype table.

+---------+-----------+-----------+------------+----------+ |   id    | objtype   | fieldname | value      | language | +---------+-----------+-----------+------------+----------+ |   1     | maintable | title     | algum texto| pt       | |   1     | maintable | text      | mais coisas| pt       | +---------+-----------+-----------+------------+----------+

and because need search in translated fields, figured use temporary table so, came problem of "which select query should use?". read posts pivot table queries, i don't know how can build query temp table like

+---------+------------+------------+----------+  |  id (pk)| field_1    | field_2    | field_3  | +---------+------------+------------+----------+  |   1     | algum texto| mais coisas|        |   +---------+------------+------------+----------+

thank you.

edit:

i accepted ad7six answer because 500.000 entries in maintable , 1.500.000 in translations 30x times faster other one.

that's not complex

it's query 1 join per translated field.

that means query/sort/whatever other e.g. (using real names it's easier read):

select     products.id,     coalesce(product_name.value, products.name) name,     coalesce(product_description.value, products.description) description     products left join     translationstable product_name     on (         product_name.language = 'pt' ,         product_name.objecttype = 'products' ,         product_name.fieldname = 'name' ,         product_name.id = products.id     ) left join     translationstable product_description     on (         product_description.language = 'pt' ,         product_description.objecttype = 'products' ,         product_description.fieldname = 'description' ,         product_description.id = products.id     )     product_name.value = "algum texto" // find products named "algum texto"

you don't need temp table

but if want create one, it's easy using query itself:

create table     products_pt select     products.id,     coalesce(product_name.value, products.name) name,     coalesce(product_description.value, products.description) description ...

this create table (no indexes) matching structure of query. if data not change can make querying multilingual data lot easier manage, has disadvantages such (obviously) translation-specific table not date if source table data changes.


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