MySQL AND keyword issue - mysql

Question

I have a query which is behaving strange...
Firstly, here is a query to get all PMs whether or not they've been read or deleted for the user ID 1:
SELECT * FROM `pms` WHERE `toid` = '1'
This returns 3 rows as expected. Next, let's see if I can get only unread messages for this user:
SELECT * FROM `pms` WHERE `toid` = '1' AND `read` = '0'
This returns 2 rows as expected. Let's see if I can get any read and unread messages which have been binned:
SELECT * FROM `pms` WHERE `toid` = '1' AND `binned` = '0'
This returns 2 rows as expected.
The query which I need to run is getting all unread and not binned messages for a specified user id. To do this, I am doing this:
SELECT * FROM `pms` WHERE `toid` = '1' AND `read` = '0' AND `binned` = '0'
However, it should be returning 1 row as I know in the database there is a message with toid as 1, read as 0 and binned as 0 but for some reason this query above is returning 0 rows...
Why is this?
UPDATE
Here is a screenshot of my table structure as seen in Sequel Pro:
Here is a screenshot of the data inside the table as seen in Sequel Pro:
As you can see there is definitely 1 record with toid as 1, read as 0 and binned as 0.
UPDATE 2
The reason these are ENUM is because I'm wishing to store a boolean value in MySQL. I do this by enforcing the column to be either a '1' or a '0' and making it default to '0' as well. If anyone has a better way of storing boolean values in MySQL then I'd love to learn.
Secondly, here is my PHP function inside of my User.class.php file which is getting the unread count using this SQL. This function is returning 0 when it should be returning 1. The $this->getUserId() is returning 1 as that is the current user I am using:
public function getUnreadCount()
{
global $database;
$sql = "SELECT * FROM `pms` WHERE `toid` = '".$this->getUserID()."' AND `read` = '0' AND 'binned' = '0'";
$query = $database->query($sql);
$count = $database->count($query);
return $count;
}
Thanks for the help so far but I still cannot work out why this isn't working. I'm using the read in the query adding backticks to prevent MySQL from using it as a keyword.
I bet its something really obvious I'm missing...

Answer 1

James, I think the problem might have to do with how the table was populated.
Since the "read" and "binned" columns' datatypes are ENUMs, you probably have to either set the correct default value ('0' or '1') or always provide a valid value when inserting a row into this table. In other words, you can't omit a value for either the "read" or "binned" columns when inserting a "pms"-row.
In other words, if your "pms" table is set up as follows, without defaults:
create table pms (
toid int,
`read` ENUM('0','1') ,
binned ENUM('0','1')
);
then you have to insert fully specified row-values like so:
insert into pms (toid, `read`, binned) values
(1, '0', '0'),
(1, '0', '1'),
(1, '1', '0'),
(1, '1', '1')
;
and avoid inserting sparse data like this:
insert into pms (toid) values (1);
insert into pms (toid, binned) values (1, '1');
insert into pms (toid, `read`) values (1, '1');
insert into pms (toid, `read`, binned) values (1, '1', '1');
Providing the correct default enum-value for those columns would also solve this issue:
create table pms (
toid int,
`read` ENUM('0','1') default '0',
binned ENUM('0','1') default '0'
);
I've set up a sqlfiddle to illustrate.

Answer 2

if your columns are integers try doing this
SELECT * FROM `pms` WHERE `toid` = 1 AND `read` = 0 AND `binned` = 0
EDIT:
it should be your columns to be integers like that in this demo.
SQLFIDDLE DEMO
or to be enum with values as strings like here
SELECT * FROM `pms`
WHERE `toid` = 1 AND `read` = '0' AND `binned` = '0'
sqllfiddle demo

Answer 3

Try to test if you have set your variables correctly. I suggest by testing if you get the right results when querying for just one variable.:
SELECT * FROM `pms` WHERE `toid` = '1'; -- 3;
SELECT * FROM `pms` WHERE `read` = '0'; -- 4;
SELECT * FROM `pms` WHERE `binned` = '0'; -- 4;
Classic mistakes would be that you have used integer values instead of string (ENUM) values or have substituted the zero for an null.
SQL FIDDLE DEMO

Answer 4

Wow haha I've just found why its not been returning the rows.
I'd mistakenly used single quotes instead of backticks in my PHP implementation of the SQL query...
So my query was actually:
$sql = "SELECT * FROM `pms` WHERE `toid` = '".$this->getUserID()."' AND `read` = '0' AND 'binned' = '0'";
When it should've been:
$sql = "SELECT * FROM `pms` WHERE `toid` = '".$this->getUserID()."' AND `read` = '0' AND `binned` = '0'";`
As you can see, near the end of the query for binned I had mistakenly used single quotes.
Can you believe it was that simple?
Just out of interest, how do you think I should be storing boolean values in MySQL?