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Discuss the count function?
The COUNT function used returns the number of tuples or values fixed in a query.
The count function comprises two types of syntax: (1) COUNT (*) - returns the number of rows in the result query, (2) COUNT ([DISTINCT] ) - in this means, the NULL values are discarded and if employed then the duplicates are as well discarded in the count.
What are the situations while DBMS should not be used? DBMS should not be used in situations like: (i) No need of security. (ii) Not difficulty to access the data (iii) N
What is the difference between WHERE and HAVING clauses?. Predicates in the WHERE clause applies to every tuple while the predicate in the HAVING clause applies to groups.
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i need to implememnt a treee based mining algorithm. do you have an expert that can do that?
explain the level architectures of the database management system
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
A student entity type has the following attributes,name..
What is RDBMS terminology for a row? A tuple is a RDBMS terminology for a row
what is data link layer
Briefly explain each of the following database terms. Use no more than 2-3 lines for each term. 1. DBMS 2. Update Anomaly 3. Alias (referring to tables in SQL queries)
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