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POT-SQL SELECT with GROUP BY id
 

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    <p>I have table with '<strong>People</strong>'</p> <p>Columns</p> <ul> <li>ID</li> <li>Name</li> <li>Age</li> </ul> <p>And table with '<strong>Notes</strong>':</p> <p>Columns</p> <ul> <li>ID</li> <li>Text</li> <li>FK_Author</li> </ul> <p>I want to select count of notes for all authors from people table and their name and age, but I want to group it by PERSON ID, not name. There are many situations when people have same name, but ID is obviously always different.</p> <p>EXAMPLE (input)</p> <p><strong>PEOPLE:</strong></p> <pre><code>╔════╦═══════╦═════╗ ║ ID ║ NAME ║ AGE ║ ╠════╬═══════╬═════╣ ║ 1 ║ John ║ 12 ║ ║ 2 ║ Annie ║ 29 ║ ║ 3 ║ John ║ 44 ║ ╚════╩═══════╩═════╝ </code></pre> <p><strong>NOTES:</strong></p> <pre><code>╔════╦═══════╦═══════════╗ ║ ID ║ TEXT ║ FK_AUTHOR ║ ╠════╬═══════╬═══════════╣ ║ 1 ║ 'aaa' ║ 1 ║ ║ 2 ║ 'aaa' ║ 1 ║ ║ 3 ║ 'aaa' ║ 2 ║ ║ 4 ║ 'aaa' ║ 2 ║ ║ 5 ║ 'aaa' ║ 3 ║ ╚════╩═══════╩═══════════╝ </code></pre> <p><strong>Expected result:</strong></p> <pre><code>╔═══════╦═════╦════════════╗ ║ NAME ║ AGE ║ TOTALCOUNT ║ ╠═══════╬═════╬════════════╣ ║ John ║ 12 ║ 2 ║ ║ Annie ║ 29 ║ 2 ║ ║ John ║ 44 ║ 1 ║ ╚═══════╩═════╩════════════╝ </code></pre> <p>When I select data I have to group by Name too if I want to select this column because if I dont, I get error.</p>
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