DBMS Constraints & Aggregates Quiz

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DBMS constraints & aggregates

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Pratikesh Devarasetty

India

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Froggy Jumps DBMS Constraints & Aggregates QuizVersión en línea DBMS constraints & aggregates por 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

Froggy Jumps

DBMS Constraints & Aggregates QuizVersión en línea

DBMS constraints & aggregates

por Pratikesh Devarasetty

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

FOREIGN KEY

PRIMARY KEY

UNIQUE

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

FOREIGN KEY

PRIMARY KEY

UNIQUE

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

FOREIGN KEY

PRIMARY KEY

UNIQUE

Which is TRUE about FOREIGN KEY?

It must always be UNIQUE

It automatically creates indexes

It can contain NULL values

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

NOT NULL

CHECK

UNIQUE

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

FOREIGN KEY

CHECK

DEFAULT

Which scenario causes AVG(column) to return NULL

Column has one NULL value

Column has only NULL values

Column has 0 and NULL values

Which aggregate function counts rows, ignoring NULLs by default?

SUM

MAX

COUNT

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

MIN

AVG

SUM

Which expression is always equivalent to AVG(column)?

SUM(column) / COUNT(*)

SUM(column) / COUNT(column)

SUM(column) / COUNT(DISTINCT column)

Which constraint combination is equivalent to a PRIMARY KEY

UNIQUE + DEFAULT

CHECK + NOT NULL

UNIQUE + NOT NULL

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

ORDER BY

GROUP BY

WHERE

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DBMS Constraints & Aggregates Quiz

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Creada por

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DBMS Constraints & Aggregates QuizVersión en línea

por 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?

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