Question

I was exploring someone’s code and I have found this query.This query is fetching data using join. But there is no use of inner join, outer join, left or right. The programmer simply writes this query.

I found this is the SMART way of writing query, if this query is right ?

SELECT 
    a.*,b.*,c.*,d.*,e.* 
FROM  
    property_photos a,property_promotions b,properties c, communities d,cities e 
WHERE 
    a.property_id = b.property_id AND 
    a.property_id = c.id AND 
    (b.promotion_id =2 OR b.promotion_id =1) AND 
    a.mainphoto="Y" AND 
    d.id=c.community_id AND 
    e.id = c.city_id AND 
    a.featured_status = 1

Is this query correct?

It this query is right, the i think, this is more better way to write queries since it will save a lot of disk space instead of use Left join/right Join like words which makes query long

SMARTY WAY

Answer 1

Yes it is alright. It is the same as an INNER JOIN.

Note:

Which Syntax to Use? Per the ANSI SQL specification, use of the INNER
JOIN syntax is preferable. Furthermore, although using the WHERE
clause to define joins is indeed simpler, using explicit join syntax
ensures that you will never forget the join condition, and it can
affect performance, too (in some cases).

Source: Sam’s – MySQL Crash Course, page 139