Error using union subquery inside in statement

Question

I'm tyring to use a where clause with a subquery inside a 'in'statement.

Thisis my query:

select *
from trading.historical_prices

where
date in (

        (select date
        from trading.historical_prices
        group by date
        order by date desc
        limit 1) 

        union 
        (
        select date
        from trading.historical_prices
        group by date
        order by date desc
        limit 7,1
        ) 


)

limit 100

But I'm getting this error:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'union 
        (
        select date
        from trading.historical_prices
        group by date
        orde' at line 13

The union query works fine when it's ran alone. How can i fix this?

Answer 1

According to this answer , you don't parenthesis.

So your query would look like so :

SELECT * 
FROM   trading.historical_prices 
WHERE  date IN 
       ( 
                SELECT   date 
                FROM     trading.historical_prices 
                GROUP BY date 
                ORDER BY date DESC limit 1 
                UNION 
                SELECT   date 
                FROM     trading.historical_prices 
                GROUP BY date 
                ORDER BY date DESC limit 7, 
                         1) limit 100