https://markokello.com/blog en-us () () Mon, 17 Feb 2020 00:00:00 GMT https://markokello.com/blog/sql-series-1 https://markokello.com/blog/sql-series-1 SQL is very easy but its also very easy to shoot yourself in the foot with grouping/aggregations, the HAVING clause, handling NULLs, and subqueries. I aim to highlight some of the common mistakes and how you can avoid them in this article. Mon, 17 Feb 2020 00:00:00 GMT () SQL