¨ Can also perform grouping on a relation before
computing aggregates
🞑 Specify a GROUP BY A1,A2,… clause at end of query
¨ Example:
“Find the average loan amount for each branch.”
SELECT branch_name, AVG(amount) AS avg_amt
FROM loan GROUP BY branch_name;
🞑 First, tuples in loan are grouped by branch_name
🞑 Then, aggregate functions are applied to each group
| branch_name | avg_amt |
| Central Downtown Mianus North Town Perryridge Redwood Round Hill | 570.000000 1250.000000 500.000000 7500.000000 1400.000000 2000.000000 900.000000 |
About us and this blog
We are a digital marketing company with a focus on helping our customers achieve great results across several key areas.
Request a free quote
We offer professional SEO services that help websites increase their organic search score drastically in order to compete for the highest rankings even when it comes to highly competitive keywords.
Subscribe to our newsletter!
More from our blog
See all posts
Section109.1:UsingStreams Astreamisanobjectthatprovidesalow-levelmeanstotransferdata.Theythemselvesdonotactasdata containers. Thedatathatwedealwithisinformofbytearray(byte[]).Thefunctionsforreadingandwritingareallbyte orientated, e.g. WriteByte(). Therearenofunctionsfordealingwithintegers,stringsetc.Thismakesthestreamverygeneral-purpose,butless simpletoworkwithif,say,youjustwanttotransfertext.Streamscanbeparticularlyveryhelpfulwhenyouare dealing with large…
Section108.1:CheckedandUnchecked C#statementsexecutesineithercheckedoruncheckedcontext.Inacheckedcontext,arithmeticoverflowraisesan exception. In an unchecked context, arithmetic overflow is ignored and…
Section107.1:Asimpleindexer classFoo { privatestring[]cities=new[]{"Paris","London","Berlin"}; publicstringthis[intindex] { get{ returncities[index]; } set{ cities[index]=value; }…
Section106.1:System.Stringclass InC#(and.NET)astringisrepresentedbyclassSystem.String.Thestringkeywordisanaliasforthisclass. The System.String class is immutable, i.e once created its state…
Section105.1:TypesofPolymorphism Polymorphism means that a operation can also be applied to values…
Section104.1:CustomActionFilters We write custom action filters for various reasons. We may have…
Byusingasynchronoussocketsaservercanlisteningforincomingconnectionsanddosomeotherlogicinthe mean time in contrast to synchronous socket when they are listening…
AccessingnetworksharefileusingPInvoke. Section102.1:Codetoaccessnetworksharedfile publicclassNetworkConnection:IDisposable { string_networkName; publicNetworkConnection(stringnetworkName, NetworkCredentialcredentials) { _networkName=networkName; varnetResource=newNetResource() { Scope=ResourceScope.GlobalNetwork,…
No Comments
Recent Posts
- Chapter109:Stream 09/05/2024
- Chapter108:CheckedandUnchecked 08/05/2024
- Chapter107:Indexer 07/05/2024