Recently, I've been reverse-engineering some code that uses PARTITION BY to perform aggregations. In reading through all the documentation I can find about PARTITION BY, it sounds a lot like GROUP BY, maybe with a little extra functionality added in? Are they two versions of the same general...
Themain difference between a full table scan and an index scanis that because data is sorted in the index tree, the query engine knows when it has reached the end of the current it is looking for. It can then send the query, or move on to the next range of data as necessary. For ...
generally in sql server we are using the terms SPID and session_id .can i know what is the difference between them ?Thanks.All replies (1)Tuesday, October 9, 2018 2:06 PM ✅Answeredhttps://dba.stackexchange.com/questions/145032/differences-between-spid-and-session-idPlease use Marked a...
[<Name of Missing Index, sysname,>] in non clustered index [Execute SQL Task] Error: The value type (__ComObject) can only be converted to variables of type Object. [ODBC Driver Manager] Data source name not found and no default driver specified [ODBC SQL Server Driver] Invalid Paramete...
SQL Server: Difference between PARTITION BY and GROUP BY https://stackoverflow.com/questions/2404565/sql-server-difference-between-partition-by-and-group-by They're used in different places.group bymodifies the entire query, like: select customerId, count(*) as orderCount...
Note.In the case of partitioned tables, TRUNCATE TABLE drops the data and index files and re-creates but preserves the partition definitions (.par) file. TRUNCATE TABLE works similarly to DELETE if there are foreign key constraints that reference the table; otherwise, it simply drops and r...
SQL vs NoSQL: Major differences There are many differences between SQL and NoSQL, all of which are important to understand when making a decision about what might be the best data management system for your organization. These include differences in: ...
The main difference between these DMVs is simple but important: sys.dm_db_index_usage_stats records how many times the query optimizer uses an index in a plan. This usage information is recorded again each time the plan is executed. (Compiling a pla...
In your case you have different object of same type. First they have different names, so object will be identified easily. If there are more than one object with the same name than use "Ordinal Identifier - Index". With "Index" property object will be identified. Was this answer ...
Of course, the difference between queries can be computed in SQL (Structure Language Query), using the EXCEPT, EXCEPT ALL or MINUS clause. However, the performance of this approach is highly inadequate, especially when the two queries are closely related to each other. In particular, assume the...