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How to join date ranges in SQL Server?
You could first do a self-join on the exchange rates which are ordered by date so that you have the start and the end date of each exchange rate, without any overlap or gap in the dates (maybe add that as view to your database – in my case I’m just using a common table expression).
How to join d.id to date range?
SELECT name, date (start_date), date (end_date), d.id as Day_Date FROM f_table1 a RIGHT JOIN d_table2 d on d.id between date (a.start_date) and date (a.end_date) Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Provide details and share your research! But avoid …
When to do a left join in SQL?
You need to do a left join in order to show all the periods available even if there are no history entries associated with that period. The criteria would be if the History date was between the period. You would also need to check if the To date was null and include it into your results
Are there constraints on the range of dates?
Note that there is a constraint on the data rows – there are (a) no gaps in the coverage of the range of dates and (b) no overlaps in the coverage. Enforcing those constraints is not completely trivial (polite understatement – meiosis).
Can you combine two tables on the same date?
I just got great help from Gord Thompson on a similar question ( Combine two tables by joining on the same date or closest prior date (not just exact matches)) but now realize my data is not what I expected. It turns out I can have Lead_Dates later than Product_Interest_Dates and this is causing the previous SQL code to drop those cases.
How to add or subtract dates in SQL Server?
If your system supports adding or subtracting 1 from a date value to obtain the next or previous day (and has a single row table called ‘Dual’), then a variation on this will work (without using any OLAP functions):
Can a lead date be later than the closest date?
It turns out I can have Lead_Dates later than Product_Interest_Dates and this is causing the previous SQL code to drop those cases. More specifically: I want two create a single table where, for each CustomerID, each Product_Interest is connected to a the Lead_Source that is the closest date ( either before or after ).