I have used a site to practice my SQL, (usually before a job interview) which I found very useful.
It is http://sqlzoo.net/
You can select the type of SQL (from MySQL, Oracle, SQL Server, Access, Postgres)
The Site gives lots of exercises, each getting progressively more difficult and covers topics from Simple Select Statements through to using the metadat of a database.
I have no affiliation whatsoever with the website, I just think that it is a useful tool for both refreshing and practicing SQL.
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