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What is the difference between a HAVING CLAUSE and a WHERE CLAUSE?
HAVING CLAUSE
- HAVING CLAUSE is used only with SELECT statement.
- It is normally used in a GROUP BY clause in a query.
- If GROUP BY isn't used, HAVING works like a WHERE clause.
WHERE Clause
- It is applied to every row before they become a part of GROUP BY function in a query.
Briefly describe concurrency execution? Lock - based protocols Locks There are several modes in which a data item may be locked in this section we restrict our attention
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Need for Client Server Computing- Client/Server (C/S) architecture includes running the application on multiple machines in which every machine with its component software tackles
Define what Immediate database modification technique uses? Ans: Both undo and redo.
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
Text Processing: Use readLines to read SOU.txt into R. Create a vector called Pres containing the names of the presidents giving each speech. To do this, rst identify the lin
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Niles Video Inc. wants to create a website for online sales of movies (DVD and videotapes). People will be allowed to register as customers on the website and to update their store
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