uncleflo
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Temporary tables in SQL query optimization
Saved by uncleflo on April 18th, 2018.
SQL queries can get complex in a big hurry. If you are querying multiple tables, and in particular if your query involves operations like UNION and INTERSECT, then you can find yourself in a big, messy pile of SQL. Worse, that big pile will often run slowly, sometimes to the point where a web application times out! I won’t inflict a real-world example on you; that would be cruel. So let’s look at a “toy” problem, keeping in mind that this won’t illustrate any time-savings, just the technique involved.
query complex temporary table operation union intersect problem description solution development database db howto sql optimize blog article
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