MySQL INNER JOIN和SELECT

Question

I am working on a small calendar application and practicing MySQL queries for finding available time slots based on the answer provided by flaschenpost

mysql show time slots avaliable and time slots busy from table

I am studying the query step by step. I ran the query below separately to see what it returns exactly.

(select 1 as place, 'Free' as name union select 2 as place, 'Booked' as name ) as d 
inner join bookingEvents b 

However, I got a syntax error:

ERROR 1064 (42000): You have an error in your SQL syntax;

I also tried the query below but still getting the same error.

   select (select 1 as place, 'Free' as name union select 2 as place, 'Booked' as name ) as d 

Please help.

Answer 1

Those are tables that belong in the from portion of your query.

Do this:

select 
    *
from
    (select 1 as place, 'Free' as name union select 2 as place, 'Booked' as name ) as d 
    inner join bookingEvents b 

Answer 2

You are missing a from in the 2nd subquery so you are executing a select statement in none of the table.

On the 2nd query you have mentioned just put * from as

select * from (select 1 as place, 'Free' as name union select 2 as place,'Booked' as name ) as d