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Because of a rich feature set and amazing integration with DB providers.

Good starting point: https://www.jetbrains.com/pages/intellij-idea-databases/

It even lints your SQL queries written in other languages. Truly gold standard.

And autocompletes, syntax highlight it. I couldn't imagine being without this.

Datagrip, as an extension, lets you work with SQL, highlighting, autocompletion, and more, inside non-SQL files, such as your programming language files. I think they call this 'language injection'.