SQL Practice Questions: Test Your Knowledge!

Which SQL clause is used to specify the number of rows to return?

FETCH

LIMIT

TOP

ROWNUM

What is the purpose of the SQL LAST_VALUE function?

To retrieve the first value within a partition

To retrieve the last value within a partition

To retrieve the nth value within a partition

To retrieve the average value within a partition

What is the purpose of the SQL IFNULL function?

To return a specified value if an expression is NULL, otherwise it returns the expression

To check if an expression is NULL

To return the first non-null value in a list of expressions

To replace NULL values with a specified value

What is the purpose of the SQL PIVOT operator?

To rotate rows into columns

To filter rows based on a condition

To join two or more tables

To aggregate data using multiple columns

What is the purpose of the SQL INSERT INTO statement?

To add new rows to a table

To update existing rows in a table

To delete rows from a table

To create a new table

Which SQL keyword is used to add a new column to an existing table?

ADD COLUMN

ALTER TABLE

MODIFY COLUMN

INSERT COLUMN

Which SQL function is used to perform a cumulative sum or running total?

SUM

RUNNING_TOTAL

CUMULATIVE_SUM

RUNNING_SUM

What is the purpose of data replication in the ETL process?

To create multiple copies of data for backup and disaster recovery

To remove duplicate records

To transform data from one format to another

To delete old data permanently

What is the purpose of the SQL EXPLAIN statement?

To show the execution plan of a query

To describe the structure of a table

To list all tables in a database

To display the privileges of a user

Which SQL statement is used to create a stored procedure?

CREATE PROCEDURE

MAKE PROCEDURE

BUILD PROCEDURE

NEW PROCEDURE

What is the purpose of data replication in the ETL process?

To create a backup of the source data

To create a copy of the target data for disaster recovery

To create a copy of the data for distribution to other systems

To create a copy of the data for testing purposes

What is the purpose of the JOIN clause in SQL?

To combine rows from two or more tables based on a related column

To filter the rows based on a condition

To sort the result set

To group the result set by one or more columns

Which SQL operator is used to perform pattern matching?

MATCH

PATTERN

COMPARE

What does the SQL LEAD function do?

Accesses data from a subsequent row in the result set

Accesses data from a previous row in the result set

Calculates the running total of a set of values

Ranks rows within a partition

What is the purpose of the PERCENT_RANK function in SQL?

To calculate the percentile rank of a value within a partition

To calculate the cumulative distribution of a value within a partition

To calculate the relative rank of a value within a partition

To calculate the moving average of a numeric column within a partition

Which SQL function returns the day of the month from a date value?

DAY()

MONTH()

YEAR()

DATE()

Which SQL clause is used to sort the result set in ascending or descending order?

SORT BY

ARRANGE BY

ORDER BY

SEQUENCE BY

Which SQL statement is used to create a table with a columnstore index?

CREATE TABLE WITH COLUMNSTORE INDEX

COLUMNSTORE INDEX TABLE

CREATE COLUMNSTORE TABLE

TABLE WITH COLUMNSTORE INDEX

What is the purpose of the LIKE operator in SQL?

To check if a value is equal to a specified value

To compare two values for equality

To perform mathematical calculations

To perform pattern matching on string values

Which SQL operator is used to combine multiple conditions and return true if all of the conditions are true?

NOT

ANY

AND

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