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DataBase Fundamentals new

DataBase Fundamentals new

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Which JOIN returns ...

(match the appropriate)

all rows from both tables and matches them where possible

all rows from the left table and matching rows from the right table

all rows from the right table and matching rows from the left table

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What is a JOIN in a relational DBMS?

A way to combine data from multiple tables

✅

A way to delete data from a table

❌

A way to update data in a table

❌

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Which of the following functions is used to return the current date and time in PostgreSQL?

NOW()

CURRENT_TIME()

DATE()

CURRENT_DATE()

Which of the following operators is used to concatenate two or more strings in PostgreSQL?

Which of the following functions is used ...

(match the appropriate)

to round a number to a specified number of decimal places in PostgreSQL

to get the position of a substring within a string in PostgreSQL

to extract a substring from a string in PostgreSQL

to get the current date and time in PostgreSQL

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Which of the following functions is used ...

(match the appropriate)

to convert a string to uppercase in PostgreSQL

to convert a string to a number in PostgreSQL

to convert a string to a date in PostgreSQL

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Which of the following functions ...

(match the appropriate)

is used to concatenate two or more strings in PostgreSQL

is used to extract a substring from a string in PostgreSQL

returns the absolute value of a number in PostgreSQL

is used to calculate the length of a string in PostgreSQL

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The SQL operator used to retrieve the data in a column of a table, based on a specified pattern is

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Which of the following is a valid syntax for using multiple columns in the GROUP BY clause?

GROUP BY column1 AND column2

❌

GROUP BY column1, column2

✅

GROUP column1 AND column2

❌

GROUP column1, column2

❌

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Which aggregate function returns ...

(match the appropriate)

the highest value of a column

the average value in a column

the lowest value of a column

the total sum of numeric values in a column

the total number of rows in the table

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