（六）作出处罚决定的公安机关的名称和作出决定的日期。
Since Mongo is a NoSQL database, it has its own JavaScript-like query language to work with data. As Postgres is an SQL database, it needed to adopt SQL to allow for working with JSON data - it has its own rich set of JSON functions and operators. Let's compare two contenders by going through lots of practical examples.
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neat, right? and this is just the tip of the iceberg. there are so many more use cases where these operators shine, and i encourage you to play around with them in the web app and see what you can come up with. you can also see the resulting automaton for each regex, and how the different components contribute to the state machine (msagl helped me a lot here).
Hard difficulty hints, answers for March 3 PipsNumber (2): Everything in this space must add up to 2. The answer is 2-4, placed horizontally.