'Truncated incorrect INTEGER value' Error

Question

I'm getting Truncated incorrect INTEGER value: 'D' warning while I try to run the following query:

UPDATE MESSAGES
SET status = CASE
    WHEN 
    (from_id='111111111' AND status='A') THEN 'S'
    WHEN 
    (to_id  ='111111111' AND status='A') THEN 'R'
    WHEN 
    ((from_id  ='111111111' AND status='R') OR
    (to_id  ='111111111' AND status='S')) THEN 'D'
    END
WHERE primary_key = '236499681204'
AND
    (CASE
    WHEN 
    (from_id='111111111' AND status='A') THEN 'S'
    WHEN 
    (to_id  ='111111111' AND status='A') THEN 'R'
    WHEN 
    ((from_id  ='111111111' AND status='R') OR
    (to_id  ='111111111' AND status='S')) THEN 'D'
    END) is not null

I have read the posts MySQL 'Truncated incorrect INTEGER value' and MYSQL Truncated incorrect INTEGER value error . But they dont apply to my case. Here, status is of type VARCHAR(1) .

Is there something I'm missing?

Edit

Here's the query for creating the table:

CREATE TABLE  `MESSAGES` (
  `primary_key` bigint(12) unsigned NOT NULL AUTO_INCREMENT,
  `from_id` varchar(9) NOT NULL,
  `to_id` varchar(9) NOT NULL,
  `status` varchar(1) NOT NULL,
  PRIMARY KEY (`primary_key`)
) ENGINE=MyISAM AUTO_INCREMENT=123456789876 DEFAULT CHARSET=latin1

Please help :(

Answer 1

it is not because of status but because of the comparison

(CASE
    WHEN 
    (from_id='111111111' AND status='A') THEN 'S'
    WHEN 
    (to_id  ='111111111' AND status='A') THEN 'R'
    WHEN 
    ((from_id  ='111111111' AND status='R') OR
    (to_id  ='111111111' AND status='S')) THEN 'D'
END) is not null

to avoid the error, cast the result of CASE into a CHAR like this:

CAST( (CASE
    WHEN 
    (from_id='111111111' AND status='A') THEN 'S'
    WHEN 
    (to_id  ='111111111' AND status='A') THEN 'R'
    WHEN 
    ((from_id  ='111111111' AND status='R') OR
    (to_id  ='111111111' AND status='S')) THEN 'D'
END) AS CHAR) is not null

now it should work ok :)