MYSQL - Select selecting rows where another column equals something - mysql

Question

I have this query:
select feature_requests.*,
from feature_requests
where feature_requests.status in ('open','closed','indevelopment')
I also have another status - denied.
I need to also select all rows with status denied but another column on my features request table must equal something.
So something that does this:
select feature_requests.*,
from feature_requests
where feature_requests.status in ('open','closed','indevelopment','denied') and
if status = denied, instance_id = ?
Not sure of the correct syntax. Thanks for any help :)

Answer 1

The WHERE clause is the correct place to put these kind of conditions, but with a few differences:
SELECT `fr`.*
FROM `feature_requests` fr
WHERE (`fr`.`status` IN ('open','closed','indevelopment')) OR
((`fr`.`status` = 'denied') AND (`fr`.`instance_id` = ?))
P.S - Notice I'm using an alias for feature_requests called fr instead of writing the whole name again and again. And You don't have to write its name at all because you're using only one table in your query, but I would still use it because it reduces the chances of future mistakes.
For further reading - SELECT Syntax

Answer 2

From rusty memory, you're probably wanting something like this
SELECT feature_requests.* FROM feature_requests
WHERE feature_requests.status IN ('open', 'closed', 'indevelopment') OR
(feature_requests.status='denied' AND instance_id = ???)
What you have right now is pretty close.
http://www.tutorialspoint.com/sql/sql-and-or-clauses.htm

Answer 3

This should work:
SELECT
feature_requests.*
FROM
feature_requests
WHERE
feature_requests.status IN ('open','closed','indevelopment') OR (
feature_requests.status='denied' AND
instance_id=?
)
This can also be written without listing the table name over and over if it is the only table that you are using like this:
SELECT
*
FROM
feature_requests
WHERE
status IN ('open','closed','indevelopment') OR (
status='denied' AND
instance_id=?
)
When using AND and/or OR in your where clause please also remember to use parenthesis ( ) to show your actual meaning even when you know what takes precedence between the AND and OR. For more information on precedence of operators with MySQl Example:
color=blue AND shape=circle OR type=ball
means
(color=blue AND shape=cirlce) OR type=ball
but could easily be misinterpreted as
color=blue AND (shape=circle OR type=ball)