SQL Fiddle
If you do not know SQL or basic database concepts, this site is not going to be very useful to you. However, if you are a database developer, there are a few different use-cases of SQL Fiddle intended for you. You want to compare and contrast SQL statements in different database back-ends. SQL Fiddle easily lets you switch which database provider (MySQL, PostgreSQL, MS SQL Server, Oracle, and SQLite) your queries run against. This will allow you to quickly evaluate query porting efforts, or language options available in each environment. You do not have a particular database platform readily available, but you would like to see what a given query would look like in that environment. Using SQL Fiddle, you don't need to bother spinning up a whole installation for your evaluation; just create your database and queries here!
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SolarWinds Database Performance Monitor
Easily assess how much effort you need to put into scaling your database infrastructure. SolarWinds® Database Performance Monitor (DPM) is a SaaS-based platform that helps increase system performance, team efficiency, and infrastructure cost savings by offering full visibility into major open-source databases including MySQL, PostgreSQL, MongoDB, Amazon Aurora, and Redis. Deploy code and compare query and system performance with before and after charts, and quickly search for newly introduced queries. Visualize and correlate query behavior to system metrics to help troubleshoot performance issues and impact.
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TablePlus
Modern, native client with intuitive GUI tools to create, access, query & edit multiple databases: MySQL, PostgreSQL, SQLite, Microsoft SQL Server, Amazon Redshift, MariaDB, CockroachDB, Vertica, Cassandra, Snowflake, Oracle, Redis.
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LINQPad
LINQPad is not just for LINQ queries, but any C#/F#/VB expression, statement block or program. Put an end to those hundreds of Visual Studio Console projects cluttering your source folder and join the revolution of LINQPad scripters and incremental developers. Reference your own assemblies and NuGet packages. Prototype your ideas in LINQPad and then paste working code into Visual Studio. Or call your scripts directly from the command-line. Experience LINQPad’s rich output formatting, optional debugger and autocompletion, and the magic of dynamic development and instant feedback! Tired of querying in antiquated SQL? Well, you don’t have to! With LINQPad, you can interactively query databases in a modern query language: LINQ. LINQPad includes an optimized engine to build typed data contexts on the fly, and includes drivers and formatters for SQL Server, SQL Azure, SQL CE, Oracle, SQLite, PostgreSQL and MySQL.
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