https://linzeyan.github.io/categories/sql/Recent content in SQL on RickyHugo -- gohugo.ioenFri, 13 Aug 2021 16:16:54 +0800https://linzeyan.github.io/posts/2021/20210813-sql-join-types-explained-visually/Fri, 13 Aug 2021 16:16:54 +0800https://linzeyan.github.io/posts/2021/20210813-sql-join-types-explained-visually/<ul> <li><a href="https://dataschool.com/how-to-teach-people-sql/sql-join-types-explained-visually/" target="_blank" rel="noopener">SQL Join types explained visually</a></li> </ul>https://linzeyan.github.io/posts/2021/20210714-sql-queries-don-t-start-with-select/Wed, 14 Jul 2021 18:11:46 +0800https://linzeyan.github.io/posts/2021/20210714-sql-queries-don-t-start-with-select/<ul> <li><a href="https://jvns.ca/blog/2019/10/03/sql-queries-don-t-start-with-select/" target="_blank" rel="noopener">SQL queries don&rsquo;t start with SELECT</a></li> </ul> <h4 id="sql-queries-happen-in-this-order">SQL queries happen in this order</h4> <ul> <li><code>FROM/JOIN</code> and all the <code>ON</code> conditions</li> <li><code>WHERE</code></li> <li><code>GROUP BY</code></li> <li><code>HAVING</code></li> <li><code>SELECT</code> (including window functions)</li> <li><code>ORDER BY</code></li> <li><code>LIMIT</code></li> </ul>