Airbnb has open sourced Airpal, the tool it built to help employees get to data they need to use, reports Gigaom. The software is built on the open source Presto SQL engine, which was created by ...

Really simple SQL question...How do I write a query that checks if something exists in a table, and if it does, it updates, if it doesn't, it inserts it into the table?<BR><BR>Like ...