DBMS Constraints & Aggregates Quiz

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DBMS constraints & aggregates

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Pratikesh Devarasetty

India

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1	Pratikesh Devarasetty 16 Avril 2026	% 100	01:15
2	Krish D Shah 17 Avril 2026	% 100	02:46

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DBMS Constraints & Aggregates Quiz


Froggy Jumps DBMS Constraints & Aggregates QuizVersion en ligne DBMS constraints & aggregates par Pratikesh Devarasetty 1 Which constraint uniquely identifies each row in a table and cannot be NULL? a FOREIGN KEY b PRIMARY KEY c UNIQUE 2 Which constraint uniquely identifies each row in a table and cannot be NULL? a FOREIGN KEY b PRIMARY KEY c UNIQUE 3 Which constraint uniquely identifies each row in a table and cannot be NULL? a FOREIGN KEY b PRIMARY KEY c UNIQUE 4 Which is TRUE about FOREIGN KEY? a It must always be UNIQUE b It automatically creates indexes c It can contain NULL values 5 Which constraint prevents duplicate values in a column, not considering NULLs? a NOT NULL b CHECK c UNIQUE 6 Which constraint defines a condition that must be true for all rows? a FOREIGN KEY b CHECK c DEFAULT 7 Which scenario causes AVG(column) to return NULL a Column has one NULL value b Column has only NULL values c Column has 0 and NULL values 8 Which aggregate function counts rows, ignoring NULLs by default? a SUM b MAX c COUNT 9 Which aggregate function gives the average value of a numeric column? a MIN b AVG c SUM 10 Which expression is always equivalent to AVG(column)? a SUM(column) / COUNT(*) b SUM(column) / COUNT(column) c SUM(column) / COUNT(DISTINCT column) 11 Which constraint combination is equivalent to a PRIMARY KEY a UNIQUE + DEFAULT b CHECK + NOT NULL c UNIQUE + NOT NULL 12 Which clause groups rows for aggregate calculations, often with HAVING for filters? a ORDER BY b GROUP BY c WHERE

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DBMS Constraints & Aggregates Quiz

Froggy Jumps

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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DBMS Constraints & Aggregates QuizVersion en ligne

par Pratikesh Devarasetty

Which constraint uniquely identifies each row in a table and cannot be NULL?

Which constraint uniquely identifies each row in a table and cannot be NULL?

Which constraint uniquely identifies each row in a table and cannot be NULL?

Which is TRUE about FOREIGN KEY?

Which constraint prevents duplicate values in a column, not considering NULLs?

Which constraint defines a condition that must be true for all rows?

Which scenario causes AVG(column) to return NULL

Which aggregate function counts rows, ignoring NULLs by default?

Which aggregate function gives the average value of a numeric column?

Which expression is always equivalent to AVG(column)?

Which constraint combination is equivalent to a PRIMARY KEY

Which clause groups rows for aggregate calculations, often with HAVING for filters?