Having problems with getting a count in a select statement - mysql

Question

I have 5 tables as follows:
files
tags
profiles
j_file_tags
j_profile_tags
So files can have tags, profiles give access to certain tags.
I put together two queries that do the following:
get a list of files that a specific profile has access to (the profile must have access to all tags a file might have)
get a list of tags that the profile has access to and where there is at least a file in that tag.
What I need for query 2 is a count of how many files are in a tag.
Here's the table structure and sample data:
CREATE TABLE `files` (
`id` int(4) NOT NULL AUTO_INCREMENT ,
`fileName` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,
`empID` int(4) NOT NULL ,
PRIMARY KEY (`id`)
)
ENGINE=InnoDB
DEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ci
ROW_FORMAT=Dynamic;
CREATE TABLE `j_file_tags` (
`id` int(4) NOT NULL AUTO_INCREMENT ,
`fileID` int(4) NULL DEFAULT NULL ,
`tagID` int(4) NULL DEFAULT NULL ,
PRIMARY KEY (`id`)
)
ENGINE=InnoDB
DEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ci
ROW_FORMAT=Dynamic;
CREATE TABLE `j_profile_tags` (
`id` int(4) NOT NULL AUTO_INCREMENT ,
`profileID` int(4) NULL DEFAULT NULL ,
`tagID` int(4) NULL DEFAULT NULL ,
PRIMARY KEY (`id`)
)
ENGINE=InnoDB
DEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ci
ROW_FORMAT=Dynamic;
CREATE TABLE `profiles` (
`id` int(4) NOT NULL AUTO_INCREMENT ,
`profileName` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL ,
PRIMARY KEY (`id`)
)
ENGINE=InnoDB
DEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ci
ROW_FORMAT=Dynamic;
CREATE TABLE `tags` (
`id` int(4) NOT NULL AUTO_INCREMENT ,
`tagName` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL ,
PRIMARY KEY (`id`)
)
ENGINE=InnoDB
DEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ci
ROW_FORMAT=Dynamic;
INSERT INTO `files` VALUES ('1', 'FileOne', '1');
INSERT INTO `files` VALUES ('2', 'FileTwo', '1');
INSERT INTO `files` VALUES ('3', 'FileThree', '1');
INSERT INTO `files` VALUES ('4', 'FileFour', '2');
INSERT INTO `files` VALUES ('5', 'FileFive', '2');
INSERT INTO `files` VALUES ('6', 'FileSix', '2');
INSERT INTO `files` VALUES ('7', 'FileSeven', '2');
INSERT INTO `profiles` VALUES ('1', 'ProfileOne');
INSERT INTO `profiles` VALUES ('2', 'ProfileTwo');
INSERT INTO `profiles` VALUES ('3', 'ProfileThree');
INSERT INTO `tags` VALUES ('1', 'TagOne');
INSERT INTO `tags` VALUES ('2', 'TagTwo');
INSERT INTO `tags` VALUES ('3', 'TagThree');
INSERT INTO `tags` VALUES ('4', 'TagFour');
INSERT INTO `tags` VALUES ('5', 'TagFive');
INSERT INTO `j_file_tags` VALUES ('1', '1', '1');
INSERT INTO `j_file_tags` VALUES ('2', '1', '3');
INSERT INTO `j_file_tags` VALUES ('3', '2', '1');
INSERT INTO `j_file_tags` VALUES ('4', '2', '5');
INSERT INTO `j_file_tags` VALUES ('5', '3', '1');
INSERT INTO `j_file_tags` VALUES ('6', '3', '3');
INSERT INTO `j_file_tags` VALUES ('7', '3', '6');
INSERT INTO `j_file_tags` VALUES ('8', '2', '3');
INSERT INTO `j_file_tags` VALUES ('9', '4', '1');
INSERT INTO `j_file_tags` VALUES ('10', '4', '2');
INSERT INTO `j_file_tags` VALUES ('11', '5', '1');
INSERT INTO `j_file_tags` VALUES ('12', '5', '6');
INSERT INTO `j_profile_tags` VALUES ('1', '1', '2');
INSERT INTO `j_profile_tags` VALUES ('2', '1', '3');
INSERT INTO `j_profile_tags` VALUES ('3', '1', '4');
INSERT INTO `j_profile_tags` VALUES ('4', '2', '1');
INSERT INTO `j_profile_tags` VALUES ('5', '2', '2');
INSERT INTO `j_profile_tags` VALUES ('6', '2', '3');
INSERT INTO `j_profile_tags` VALUES ('7', '2', '4');
INSERT INTO `j_profile_tags` VALUES ('8', '2', '5');
INSERT INTO `j_profile_tags` VALUES ('9', '1', '1');
INSERT INTO `j_profile_tags` VALUES ('10', '1', '5');
Here are my 2 queries:
/* Get list of files: limit by specific employee AND by tags the use has access to */
SELECT
`files`.`id`,
`files`.`fileName`,
`files`.`empID`,
GROUP_CONCAT(CONCAT(`tags`.`id`) SEPARATOR ', ') as `FileTags`
FROM `files`
LEFT JOIN `j_file_tags` ON `j_file_tags`.`fileID` = `files`.`id`
LEFT JOIN `tags` ON `tags`.`id` = `j_file_tags`.`tagID`
WHERE
`files`.`empID` = 1
AND
`j_file_tags`.`tagID` IN (1,2,3,4,5)
GROUP BY
`files`.`id`
HAVING
COUNT(`j_file_tags`.`id`) = (SELECT COUNT(`j_file_tags`.`id`) FROM `j_file_tags` WHERE `j_file_tags`.`fileID` = `files`.`id` );
/* SECOND QUERY where i need help */
SELECT
`tags`.`id`,
`tags`.`tagName`,
'1' as `fileCount` /* i need this to be an actual count */
FROM
`tags`
LEFT JOIN `j_file_tags` ON `j_file_tags`.`tagID` = `tags`.`id`
LEFT JOIN `files` ON `files`.`id` = `j_file_tags`.`fileID`
LEFT JOIN `j_profile_tags` ON `j_profile_tags`.`tagID` = `tags`.`id`
WHERE
`j_profile_tags`.`profileID` = 1
AND
`files`.`empID` = 1
GROUP BY
`tags`.`id`;
/* the fileCount column would need to say for TagOne - 2, for TagThree - 2 and for TagFive - 1 */
In the sample data the first query returns:
| 1 | FileOne | 1 | 1, 3
| 2 | FileTwo | 1 | 3, 1, 5
The second query returns:
| 1 | TagOne | should return 2
| 3 | TagThree | should return 2
| 5 | TagFive| | should return 1

Answer 1

The answer is simple the HAVING clause that you have in the first query is throwing off your results because there are truly 3 files with tags 1 and 3. I would suggest removing it all together or figuring out another way to do it. I rewrote your query below to display your desired result, however it is not a fix all.
SELECT
tags.id,
tags.tagName,
count(fileID) as 'fileCount'
FROM files
LEFT JOIN j_file_tags ON j_file_tags.fileID = files.id
LEFT JOIN tags ON tags.id = j_file_tags.tagID
WHERE
files.empID = 1
AND
j_file_tags.tagID IN (1,2,3,4,5)
AND
fileID IN (1,2)
GROUP BY
tags.id