GroupBy and Aggregate over date ranges

Problem

Need to be able to group and aggregate over ranges of dates (ie. every month, every 2 months, every year, etc)

Suggested solution

Add datetime operators to the groupBy key. Maybe like:

{ groupBy: { dateCol: { 'year': 1 } } to group by year or { groupBy: { dateCol: { 'month': 2 } } to group by 2-month intervals

Prisma generate could emit these groupBy interfaces for any column that is a datetime.

Additional context

This was commented as a suggestion last year on the original groupBy issue: https://github.com/prisma/prisma-client-js/issues/1#issuecomment-716578358

But it seems it was ignored and the original issue is now closed 😞

[melanke]

This is extremely important. Another usecase: Timeline Chart

[bmcilw1]

I would appreciate this feature too. To make this less abstract I’ll provide a stretch example that’s a good bit beyond what we can do so far. Here’s an example query that I’m currently doing

    return this.prisma.$queryRaw`
      SELECT accountId, COUNT(id) as loginOrResumeCount, DATE(CONVERT_TZ(timestamp,'+00:00','-5:00')) as summaryDate 
      FROM ActivityLog WHERE typeOid = ${ACTIVITY_TYPE.login_or_resume} 
      AND timestamp >= ${startDate} AND timestamp < ${endDate} 
      GROUP BY accountId, summaryDate;`;

To fully support this query, Prisma would need

• Group by support
• Count by column
• Group by DateTime column (this issue)
• Casting of DateTime to Date UTC (I believe should also be supported when dates are added)
• Casting of DateTime to Date taking into account timezone information stored in the DateTime field (only if MySQL/SQL etc. allows you to store a DateTime in a non-UTC format, I’m not sure if it does)?
• Casting of DateTime to the Date boundaries of a passed-in timezone

To really add support for grouping by dates, we probably need to handle each one of these tasks or we’re still going to need to do them with raw queries.