Question

I have a table with following columns:

ID startdate enddate

I want the rows of this table to be repeated as many times as the difference between startdate and enddate along with a column which gives all the dates between these two days for each id in the table. So, my new table should be like this:

ID Date

A startdate
A startdate +1 day
A startdate +2 days (till enddate)
B startdate
B startdate + 1 day ....

Please note that I have different start and end dates for different IDs.

I tried the answer for the following question, but this doesn’t work:

Mysql select multiple rows based on one row related date range

Answer 1

You need a numbers table… create a temporary table or dummy table that contains the numbers 1 to X (X being the maximum possible difference between the two dates)

Then join to that table using a date diff

I’m afraid I’m SQL Server and so not sure if the datediff functions work the same way in mysql, but you should get the idea.

SELECT
    DateTable.Id,
    DATEADD(dd, NumbersTable.Number, DateTable.StartDate)
FROM
    DateTable
INNER JOIN
    NumbersTable
ON
    DATEADD(dd, NumbersTable.Number, DateTable.StartDate) <= DateTable.EndDate
ORDER BY
    DateTable.Id,
    DATEADD(dd, NumbersTable.Number, DateTable.StartDate)