Adding some logic in your MySQL

I'm not an expert in SQL queries, I just know how to do simple queries and the more advanced options I've ever used are DISTINCT, HAVINGand GROUP BY.

For the project I'm working on, I had to add some logic to my SQL queries, to concatenate various field and compare them.

Here is, as a reminder, how I've managed to I've managed to get the time spent by comparing two dates :


And is practice is never as easy as theory, I didn't really had a timestamp but two string fields instead (one dateand one time), so here's how I combined them

TIMESTAMPDIFF(SECOND, CONCAT(, " ", Timestamp.time), CONCAT(, " ", Timestamp.time)) AS timeSpent

Tags : #mysql #having #group-by #distinct #timestampdiff #concat

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