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Given a date table and a data table that contains identifies and a date:

Ident Date
A 1/05/2025
A 3/02/2025
A 4/15/2025

Given a date table and a data table that contains identifies and a date:

Ident Date
A 1/05/2025
A 3/02/2025
A 4/15/2025

Get a result like:

Year Month Ident Date
2025 01 A 1/05/2025
2025 02
2025 03 A 3/02/2025
2025 04 A 4/15/2025
2025 05
2025 06
2025 07

Etc.

So, like how linking dated information to a Date dimension table in Power Bi will give you similar results where year/month with no data shows the year/month and blank.

  • t-sql
  • snowflake-cloud-data-platform
Share Improve this question edited Mar 27 at 17:06 user1911400 asked Mar 27 at 13:07 user1911400user1911400 33 bronze badges 7
  • 2 Based on the formatting of your date value, it suggests it's a string based data type, not a date; I hope it's not. – Thom A Commented Mar 27 at 13:16
  • 1 Why can you not JOIN on the YEAR and MONTH of the date value? Or is the problem that you're getting poor performance and want better™? – Thom A Commented Mar 27 at 13:17
  • T-SQL is a SQL dialect that is used by multiple products including Sybase, SQL Server, and Azure Synapse. What is the (R)DBMS product you are using here? Edit your question to tag that product, and (if relevant) the version tag for the product as well. – Thom A Commented Mar 27 at 13:21
  • Can you have multiple values for a single month? – Thom A Commented Mar 27 at 13:36
  • 1 I don't see enough sample data yet to accurately produce a query. The sample should be enough to (just barely) cover each possible edge case, such as multiple values in the same month, as well as define start and end boundaries. Omissions because they won't exist in data should be indicated in the text. – Joel Coehoorn Commented Mar 27 at 13:43
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1 Answer 1

Reset to default 0

As mentioned in comments, I am assuming there is limited set of data given in the question.
You already mentioned there is a date dimension in PowerBI which can be used.In the query below I have created a temporary date dimension for the year 2025 for each month.This date dimension can be joined with your table on year and month.

Sample query is in Snowflake since you mentioned it is going to be implemented in Snowflake.

WITH date_range AS (
    SELECT DATEADD(MONTH, seq4(), '2025-01-01') AS month_start
    FROM TABLE(GENERATOR(ROWCOUNT => 12)) -- 2025 for 12 months
)
,date_dim AS 
(SELECT YEAR(month_start) AS Year,MONTH(month_start) AS Month
FROM date_range
)
SELECT 
d.Year,d.Month,t.Ident,t.Date
FROM date_dim d
LEFT JOIN  t
ON d.Year = YEAR(t.Date)
AND d.Month = MONTH(t.Date)
ORDER BY d.Year, d.Month;

Output

本文标签： t sqlUse Date table as a scaffold for dated informationStack Overflow

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