MySQL: Count Columns Per Row - mysql

Question

I just want to know if counting columns is possible as you're counting rows without calling each column name. For example:
SELECT COUNT(FOUND COLUMNS) AS counted FROM table WHERE a_value EXISTS IN COLUMNS
/*
The same as this specified one. This is working but I'm
looking for another approach without calling each column name.
SELECT (IF(col1="Y",1,0) + IF(col2="Y",1,0)) as counted FROM table
*/
Which I wish will throw results per row like:
| counted |
|-----------|
| 2 |
| 1 |
| 0 |
IS THAT POSSIBLE? If yes, how?

Answer 1

SELECT COUNT(COLUMN_NAME)
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_CATALOG = 'database' AND TABLE_SCHEMA = 'dbo'
AND TABLE_NAME = 'table'
Try this it will work.

Answer 2

I think you are looking for that
THE SCHEMA
CREATE TABLE `numbers`( `col1` INT, `col2` INT, `col3` INT, `col4` INT );
INSERT INTO `numbers` (`col1`, `col2`, `col3`, `col4`) VALUES ('0', '0', '0', '6');
INSERT INTO `numbers` (`col1`, `col2`, `col3`, `col4`) VALUES ('1', '0', '0', '9');
INSERT INTO `numbers` (`col1`, `col2`, `col3`, `col4`) VALUES ('4', '1', '0', '2');
INSERT INTO `numbers` (`col1`, `col2`, `col3`, `col4`) VALUES ('9', '5', '1', '3');
INSERT INTO `numbers` (`col1`, `col2`, `col3`, `col4`) VALUES ('5', '0', '6', '4');
INSERT INTO `numbers` (`col1`, `col2`, `col3`, `col4`) VALUES ('2', '0', '1', '6');
INSERT INTO `numbers` (`col1`, `col2`, `col3`, `col4`) VALUES ('8', '5', '6', '7');
COUNT THE VALUE '0' OF EACH ROW
SELECT (c1+c2+c3+c4) AS counted FROM
(
SELECT
CASE WHEN col1 = 0 THEN 1 ELSE 0 END AS c1,
CASE WHEN col2 = 0 THEN 1 ELSE 0 END AS c2,
CASE WHEN col3 = 0 THEN 1 ELSE 0 END AS c3,
CASE WHEN col4 = 0 THEN 1 ELSE 0 END AS c4
FROM numbers
) AS temp_count
/RESULT/
counted
3
2
1
0
1
1
0
COUNT THE VALUE '7' OF EACH ROW
SELECT (c1+c2+c3+c4) AS counted FROM
(
SELECT
CASE WHEN col1 = 7 THEN 1 ELSE 0 END AS c1,
CASE WHEN col2 = 7 THEN 1 ELSE 0 END AS c2,
CASE WHEN col3 = 7 THEN 1 ELSE 0 END AS c3,
CASE WHEN col4 = 7 THEN 1 ELSE 0 END AS c4
FROM numbers
) AS temp_count
So you must replace the value of col1 = 7,col2 = 7,col3 = 7,col4 = 7, if you want check the others value.