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Editorial Team
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Asked: 2026-05-23T02:24:13+00:00

I am currently writing a query to generate a weekly report from every Monday

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I am currently writing a query to generate a weekly report from every Monday to the next Sunday. 

SELECT top 10 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield), '19000101') as EveryMonday, 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield)+1, '19000101')-1 as EverySunday, count(items)
FROM myitemtable
GROUP BY 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield), '19000101') as EveryMonday, 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield)+1, '19000101')-1 as EverySunday

vs

SELECT count(items)
FROM myitemtable
WHERE mydatefield >= '2011/05/30 00.00.000' and mydatefield <= '2011/06/05 23.59.59'

What is wrong with the above query. The counts add up to a different number in the first and second queries.

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1 Answer

  1. Editorial Team

    Without particularly understanding the query (since I normally write in a far more standard variant of SQL than tsql uses), my gut reaction when looking at your query was that this could be a timezone problem. But, what you need to do is verify the answers you are getting are what you expect. To do this, run:

    SELECT mydatefield,
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield), '19000101') as EveryMonday, 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield)+1, '19000101')-1 as EverySunday
FROM myitemtable
WHERE mydatefield >= '2011/05/30 00.00.000' and mydatefield <= '2011/06/05 23.59.59'

    if this is too much data, here is another option:

    SELECT min(mydatefield),max(mydatefield),count(*),
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield), '19000101') as EveryMonday, 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield)+1, '19000101')-1 as EverySunday
FROM myitemtable
WHERE mydatefield >= '2011/05/30 00.00.000' and mydatefield <= '2011/06/05 23.59.59'
GROUP BY 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield), '19000101') as EveryMonday, 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield)+1, '19000101')-1 as EverySunday

    and the related:

    SELECT min(mydatefield),max(mydatefield),count(*),
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield), '19000101') as EveryMonday, 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield)+1, '19000101')-1 as EverySunday
FROM myitemtable
GROUP BY 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield), '19000101') as EveryMonday, 
 DATEADD(WEEK, DATEDIFF(WEEK, '19000101', mydatefield)+1, '19000101')-1 as EverySunday

    Running these queries should help you understand if the “EveryMonday” and “EverySunday” queries are generating the values you expect. Seeing the min/max dates will help you understand when the mismatches are occurring.

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