Web – Database online tool : sqlfiddle.

This tool can help you to deal with many databases and share it online for help.
For example to share your query to dba.stackexchange.com.
Just start with setting the work environment and Build Schema.
Or just, you can put in your query, run it, and see the output and even the execution plan.
The web interface is simple and intuitive for those who have already worked with database queries.

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