Monday, 20 July 2015

Ms sql group by with min or max

Top sites by search query "ms sql group by with min or max"

PostgreSQL vs. MS SQL Server


  http://www.pg-versus-ms.com/
The computers on the International Space Station (the most expensive single man-made object in existence) were moved from Windows to Linux in 2013 "in an attempt to improve stability and reliability". A data analytics platform has to be able to look at data from a wide variety of systems and produce outputs that can be read by a wide variety of systems

sql - Optimizing large database query (25+ million rows, using max() and GROUP BY) - Database Administrators Stack Exchange


  http://dba.stackexchange.com/questions/75963/optimizing-large-database-query-25-million-rows-using-max-and-group-by
There is also DISTINCT ON as another possible query technique, but it's hardly going to be faster than your original query, so not the answer you are looking for

  http://www.brentozar.com/archive/2011/09/sysadmins-guide-microsoft-sql-server-memory/
Some of these changes (like AWE) will only take effect upon restart of the SQL Server service, while others (like decreasing Max Server Memory) will take effect instantly. I see a lot of SQL Servers running on boxes with just 4-16GB of memory, trying to support 100GB of databases, and the sysadmin just needs a quick, easy, and risk-free fix

SQL TWIST - This Week in SQL Server Technology


  http://sqltwist.com/
If you ever needed to determine how many VLFs are within a database you can run DBCC LOGINFO from within the context database and the total number of rows returned would give you your VLF account. Essentially having too many VLFs can affect performance of any activity that reads from the transaction log such as Replication, AlwaysOn Availability Groups, Mirroring, Database Recovery etc

MySQL :: MySQL 5.6 Reference Manual :: 12.19.1 GROUP BY (Aggregate) Functions


  http://dev.mysql.com/doc/refman/5.6/en/group-by-functions.html
But if it's not indexed, SQL would have to evaluate each row individually anyway.You can take the idea a stage further by using a WHERE clause on the query too. By using the LIMIT keyword, we can proceed directly to (at worst) a scan over half the values (also required where sequence numbers are assigned) to fetch the median value or the two middle values

Using the GROUP BY Clause to Group SQL Query Results


  http://databases.about.com/od/sql/a/Group_By_SQL.htm
SQL also provides you with the ability to group query results based upon row-level attributes in order to apply aggregate functions using the GROUP BY clause

SQL Server Forums - Min and Max of Date per Day


  http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=144162
The start time of the process will be the datetime of the first task in that process and the finish time will be the datetime of the final task within that process

  http://www.microsoft.com/en-us/server-cloud/products/sql-server/
Faster insights on any data Get to insights faster with a complete BI platform that speeds up how you access, analyze, clean and shape both internal and external data. Back to top SQL Server 2014 in the news Gartner Read Gartner's Magic Quadrant for Advanced Analytics Platforms Read the story Gartner Read Gartner's Magic Quadrant for Business Intelligence and Analytics Platforms Read the story Gartner Read Gartner's Magic Quadrant for Data Warehouse and Data Management Solutions for Analytics 2015 Read the story TechRadar.pro Microsoft SQL Server 2014 review: The database heads into memory for Microsoft's latest release Read the review Back to top SQL Server blog Announcing Spark for Azure HDInsight public preview 10 Jul 2015 04:10 PM by T.K

  http://www.microsoft.com/en-us/server-cloud/products/sql-server-editions/
Learn more Standard SQL Server Standard provides core data management and business intelligence capabilities for non-critical workloads with minimal IT resources. Back to top Other editions Compact edition Microsoft SQL Server Compact edition is a free, embedded database that software developers can use for building ASP.NET websites and Windows desktop applications

T-SQL problem...selecting TOP 1 of each GROUP in GROUP BY? - Microsoft SQL Server


  http://bytes.com/topic/sql-server/answers/144835-t-sql-problem-selecting-top-1-each-group-group
The problem is of course that if I add 'top 1' after select, it only brings back 1 record full stop, rather than 1 for each group! Now, I have previously come up with a similar query that DOES do this successfully, but it relies on a criteria (such as a unique identifier) -unfortunately, the nature of the table I'm using for this current job means that it actually doesn't have a primary key, as it's simply a staging area for raw data, and can even have completely identical records in it. I think the only way I'm going to be able to do it is to literally use the 'TOP' command somehow, but am not sure how to adapt the above to implement it...I'd be very grateful for any advice

  http://stackoverflow.com/questions/723054/extra-fields-with-sql-min-group-by
Will the employee name (and any other employee fields) be from the same row? Namely the row with the MIN(salary)? I know there could very possibly be two employees with the same (and lowest) salary, but all I'm concerned with (now) is getting all the information on the (or a single) cheapest employee

SQL Server: GROUP BY Clause


  http://www.techonthenet.com/sql_server/group_by.php
Description The SQL Server (Transact-SQL) GROUP BY clause is used in a SELECT statement to collect data across multiple records and group the results by one or more columns

SQL: GROUP BY Clause


  http://www.techonthenet.com/sql/group_by.php
Description The SQL GROUP BY clause can be used in a SELECT statement to collect data across multiple records and group the results by one or more columns

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