Follow the Order of Execution
The SQL order of execution refers to the way programming clauses are listed. Analysts often create problems for themselves by changing the ideal order of execution. Much like baking a cake, your query needs to follow the right steps to achieve the best result.
Here’s the correct order:
from – Define which tables you’ll source data from
where – Apply filters to your base data
group by – Aggregate your data
having – Filter the aggregated data
select – Display the final data
order by – Sort data for easy viewing
limit – Restrict the number of results
Follow the order of execution, and your queries will run smoothly without needing many performance boosting tricks.