Sql server group by count null

Rolled back tag change as the DBMS is always relevant Show 8 more comments. Active Oldest Votes. Improve this answer. No, the 1 comes from the fact that when you full outer join to b, every row in b will have a row in your resultset, meaning the count of rows for that date will really be 1, even if you don't have any data from table a for that row. I was about 10 seconds ahead of you! Thanks though! If you had no events on a given day in your table, wouldn't this omit that date? Yes, but as mentioned in the original question I did validate that all the dates are there, plus this table is MASSIVE and there are tens of thousands of logged events per day.

Add a comment. IndexedDate group by coalesce IndexedDate , dateadd d, mycounter, mindt option maxrecursion 0 ; We basically need two main figures, the starting date and the date range.

The we build a quick counter for the number of days in the date range. Here is a functional example. EoinS EoinS 4, 1 1 gold badge 15 15 silver badges 29 29 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. It will be removed in a future version.

Avoid using this syntax in new development work, and plan to modify applications that currently use this syntax. Specifies to include all groups in the results regardless of whether they meet the search criteria in the WHERE clause. Groups that don't meet the search criteria have NULL for the aggregation. After the query finishes, the redistributed table is dropped.

The original table is not changed. By default, MPP already redistributes data as necessary to improve performance for aggregations. The maximum number of groups is 2 Both CUBE and the grouping set produce a grand total row and duplicate grouping sets are not eliminated. This example uses the backwards compatible syntax. It generates 2 13 grouping sets and will fail. This limit originates from the limit of 8, bytes on the intermediate worktable that is needed to hold intermediate query results.

ColumnN , which are semantically equivalent. ColumnN , which are not semantically equivalent. Grouping sets are not allowed inside grouping sets. An, C1, C2, ALL is the default and is implicit. It is also only allowed in the backwards compatible syntax. In the next query, we will count how many employees are in each department, including the "NULL" department:. This makes it look like NULL is one department with two employees.

There is another confusing point in the previous result: the way the NULL is represented by a blank line is not clear. Let's see the following query:. Let's try executing some queries using NULL values as parameters in aggregate functions. Let's try using the COUNT distinct column aggregate function, which counts all the different values in a column.

How does this treat NULL values? The query returned a "3", but there are four different salaries: , , , and NULL.