Question

I have a table with languages.

I would like to make a query that gets rows with specified language, but if it won’t return any data – with default language.

Is this possible to do in one query?

UPDATE:

My table: Language
Fields:

id – (primary key, unique),

lang – (text, not unique),

content – (text, not unique).

and my current query is:

SELECT * FROM Languages WHERE (id='1') AND (lang = 'es') 

As I mentioned before if above query won’t return anything I would like to get results form default language:

SELECT * FROM Languages WHERE (id='1') AND (lang = 'en') 

‘en’ is default language in this example.

Answer 1

Something like this:

(SELECT CASE
    WHEN ((SELECT ID FROM table WHERE language = specified language) IS NULL)
    THEN
      default language
    ELSE
      specified language
    END);

It will return your desired language, based on the result of the subquery. Plug that into the WHERE clause of your final query.