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I have a table with a column REGDATE, a registration date (YYYY-MM-DD HH:MM:SS). I would like to show an histogram (ExtJS) in order to understand in which period of the years users are signing up. I would like to do this for the past twelve months with respect to the current date and to group dates by week.
Any hints?
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How to Get Last 12 Months Sales Data in SQL. mysql> select * from sales where order_date> now() - INTERVAL 12 month; In the above query, we use system function now() to get current datetime. Then we use INTERVAL clause to filter those records where order_date falls after an interval of 12 months before present datetime ...
You can group month and year with the help of function DATE_FORMAT() in MySQL. The GROUP BY clause is also used.
Here's the SQL query to get records from last 7 days in MySQL. In the above query we select those records where order_date falls after a past interval of 7 days. We use system function now() to get the latest datetime value, and INTERVAL clause to calculate a date 7 days in the past.
FWIW in PostgreSQL, Karaszi has an answer that works, but there is a faster query:
SELECT date_trunc('week', REGDATE) AS "Week" , count(*) AS "No. of users" FROM <<TABLE>> WHERE REGDATE > now() - interval '12 months' GROUP BY 1 ORDER BY 1; I based this off the work of Ben Goodacre
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