¨ SQL also has an UPDATE command for modifying existing tuples in a table
🞑General form:
UPDATE table
SET attel=vall, attr2=va12, . . .
WHERE condition ;
🞑 Must specify the attributes to update
🞑 Attributes being modified must appear in table being updated (obvious)
🞑 The WHERE clause is optional! If unspecified, all rows are updated.
🞑 WHERE condition can contain nested queries, etc
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
Section 112.1: Avoiding Reading and Writing Data Simultaneously Sometimes, you want your…
Section111.1:IsHighResolution The IsHighResolution property indicates whether the timer is based on a…
Section110.1:MultithreadedTimersSystem.Threading.Timer-Simplestmultithreadedtimer.Containstwomethodsandoneconstructor. Example: A timer calls the DataWrite method, which writes "multithread executed…"…
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…
No Comments
Recent Posts
- Chapter112:Threading 12/05/2024
- Chapter111:Stopwatches 11/05/2024
- Chapter110:Timers 10/05/2024