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POMySQL: query should return rows with count 0
 

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    <p>I have 2 tables - User and Department and query that returns a count of users by departments. If user don't have department that returns "No department". But I needs to get also <strong>departments without user</strong> as count <strong>0</strong>. This is my query:</p> <pre><code>SELECT COALESCE(departments.name, 'No department') AS name, count( * ) AS count FROM users LEFT JOIN departments ON departments.id = users.department_id WHERE users.is_deleted = 0 AND users.company_id = 1 AND (TIMESTAMPDIFF(YEAR, `date_of_birth`, CURDATE()) BETWEEN 1 AND 18 ) GROUP BY departments.name </code></pre> <p>It should like this:</p> <pre><code>________________________ Dep name | count | ________________________ Dep 1 | 2 | ________________________ Dep 2 | 3 | ________________________ Dep 3 | 0 | if users in this department not exist ________________________ No dep | 1 | if users not have department ________________________ </code></pre> <p>Help me, please, guys!</p> <p>I found the solution </p> <pre><code>SELECT COALESCE(locations.name, 'Without location') AS location, COUNT(IF(TIMESTAMPDIFF(YEAR, date_of_birth, CURDATE()) BETWEEN 1 AND 17, 1, NULL)) 'group_1_17' FROM users LEFT JOIN locations ON locations.id = users.location_id WHERE users.is_deleted = 0 AND users.company_id = :company_id GROUP BY locations.name UNION SELECT locations.name AS location, 0 'group_1_17' FROM users RIGHT JOIN locations ON locations.id = users.location_id WHERE locations.company_id = :company_id AND users.id IS NULL" </code></pre>
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    1. USMary Dear
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    1. COCOUNT departments.id instead
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    2. COErm, instead of COUNT(*) !?!
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    3. COSo, it doesn't work
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