Ready to host your own groupings? You should be feeling pretty confident with your ability to dish up SQL data by now. We think you’re ready to work the room and welcome a new guest to your queries: the GROUP BY clause. This chapter covers techniques for building and analyzing groups of table data. And if those groups must meet certain criteria to make it onto your RSVP list, there’s always HAVING to filter your group results. We’ll even teach you a classic mnemonic to be sure the clauses at your get-together take a seat in their assigned SQL order. The table’s set, the data’s ready, and we’ve sent the group invites—come on in.
Group aggregates ASAP
You and Josh built up quite the data handling reputation with Dataville’s Town Council when you helped his mom, Stacy, gather employment information. In fact, Josh just received a pressing email from his mom’s fellow council member, Mr. Ortiz:
SUM with WHERE
If Josh just needs to find the total number of people employed at car repair shops, he can add a WHERE clause to his ...
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