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What are the three classes of SQL expression?
SQL expression consists of three clauses:
Select
From
Where
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
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Storage Of Database On Hard Disks At this point, it is worthwhile to note the difference among the terms file Organisation and the access method. A file organisation shows to t
Why are cursors necessary in embedded SQL? A cursor is an object used to store the output of a query for row-by-row processing through the application programs. SQL statements
#question. Draw a picture of a moving source and the waves surrounding it according to what you observed in this experiment. How does the spacing of the wave-fronts in front of the
Explain the function of Object model Object model describes the classes of objects in system, including their attributes and operations which they support. The analysis object
Entity types that do not have any key attribute, and therefore cannot be identified independently, are known as weak entity types. A weak entity can be recognized uniquely only by
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
wh
What is transaction? Transaction is a unit of program implementation that accesses and possibly updated several data items.
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