Update table after converting data from another table in SQL Server?

Question

i have two tables, i want to update column of one table with column of another table where date is equal in both tables. Here problems is date in two tables is different.

SELECT UploadedDateTime = LEFT(CAST(UploadedDateTime AS DATETIME), 11),
        COUNT(DISTINCT ClientID) AS 'DocsCount' 
FROM ClientUploadedTaxDocuments
WHERE CONVERT(DATETIME, CONVERT(NVARCHAR(10), UploadedDateTime, 101)) > '1/1/2014' 
GROUP BY LEFT(CAST(UploadedDateTime AS DATETIME), 11)
ORDER BY LEFT(CAST(UploadedDateTime AS DATETIME), 11) 

out put of above query is,

1..

select * from FilesReceivedReport

2..

here i want to update Y2014(Column of 2nd table) with DocsCount(Column of 1st table) where date is equal.

Thanks

Answer 1

First, give the first selected column some nice name. Add "AS date", so it becomes

SELECT UploadedDateTime = LEFT(CAST(UploadedDateTime AS DATETIME), 11) AS 'Date',
    COUNT(DISTINCT ClientID) AS 'DocsCount' 
FROM ClientUploadedTaxDocuments
WHERE CONVERT(DATETIME, CONVERT(NVARCHAR(10), UploadedDateTime, 101)) > '1/1/2014' 
GROUP BY LEFT(CAST(UploadedDateTime AS DATETIME), 11)
ORDER BY LEFT(CAST(UploadedDateTime AS DATETIME), 11) 

Then, try something like this:

UPDATE f set Y2014 = s.DocsCount FROM FilesReceivedReport AS f
INNER JOIN (your_complicated_select) AS s
ON f.D == s.Date