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SKASC 16 & 17: MINUS Operator in SQL

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Questions and Answers

What is the data type of the returned values when both component queries select values of data type VARCHAR2?

DATE

VARCHAR2 (correct)

CHAR

NUMBER

In the example SELECT statements provided, what is displayed for the 'location' column?

department ID

NULL (correct)

hire date

location ID

What does the UNION operator do when used between the SELECT statements in the examples?

Concatenates the results from both queries

Combines the results and removes duplicate rows (correct)

Performs an inner join operation on the results

Only displays results from the second query

What is the purpose of the COLUMN a_dummy NOPRINT statement in the provided SQL example?

To hide the 'a_dummy' column when printing query results Signup and view all the answers

How many operators are there in SET Operators as mentioned in the text?

2 Signup and view all the answers

What determines the data type of the returned values when both component queries select values of data type VARCHAR2?

The data type remains VARCHAR2 Signup and view all the answers

What is displayed when using the UNION operator to combine the SELECT statements for all employees?

employee_id, job_id, and 0 Signup and view all the answers

What is the purpose of using the SET Operators mentioned in the text?

To combine results from multiple queries Signup and view all the answers

What does the 'ORDER BY a_dummy' clause achieve in the SQL example provided?

It sorts the result set in ascending order of a_dummy values Signup and view all the answers

Which statement accurately describes the UNION operator?

UNION concatenates columns from different tables vertically Signup and view all the answers

In the example SELECT statements, what is the purpose of 'TO_NUMBER(null)' and 'TO_DATE(null)'?

Converting NULL values to specific data types Signup and view all the answers

'COLUMN a_dummy NOPRINT' is used for what purpose?

To hide the 'a_dummy' column from query results Signup and view all the answers

'SELECT department_id, location, hire_date FROM employees UNION...' retrieves which columns?

'department_id', 'location_id', and 'hire_date' Signup and view all the answers

'UNION' is an operator that performs what function between datasets?

'Concatenation' Signup and view all the answers

SKASC 16 & 17: MINUS Operator in SQL

Choose a study mode

Podcast

Questions and Answers

What is the data type of the returned values when both component queries select values of data type VARCHAR2?

In the example SELECT statements provided, what is displayed for the 'location' column?

What does the UNION operator do when used between the SELECT statements in the examples?

What is the purpose of the COLUMN a_dummy NOPRINT statement in the provided SQL example?

How many operators are there in SET Operators as mentioned in the text?

What determines the data type of the returned values when both component queries select values of data type VARCHAR2?

What is displayed when using the UNION operator to combine the SELECT statements for all employees?

What is the purpose of using the SET Operators mentioned in the text?

What does the 'ORDER BY a_dummy' clause achieve in the SQL example provided?

Which statement accurately describes the UNION operator?

In the example SELECT statements, what is the purpose of 'TO_NUMBER(null)' and 'TO_DATE(null)'?

'COLUMN a_dummy NOPRINT' is used for what purpose?

'SELECT department_id, location, hire_date FROM employees UNION...' retrieves which columns?

'UNION' is an operator that performs what function between datasets?

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SKASC 16 &amp; 17: MINUS Operator in SQL

Choose a study mode

Podcast

Questions and Answers

What is the data type of the returned values when both component queries select values of data type VARCHAR2?

In the example SELECT statements provided, what is displayed for the 'location' column?

What does the UNION operator do when used between the SELECT statements in the examples?

What is the purpose of the COLUMN a_dummy NOPRINT statement in the provided SQL example?

How many operators are there in SET Operators as mentioned in the text?

What determines the data type of the returned values when both component queries select values of data type VARCHAR2?

What is displayed when using the UNION operator to combine the SELECT statements for all employees?

What is the purpose of using the SET Operators mentioned in the text?

What does the 'ORDER BY a_dummy' clause achieve in the SQL example provided?

Which statement accurately describes the UNION operator?

In the example SELECT statements, what is the purpose of 'TO_NUMBER(null)' and 'TO_DATE(null)'?

'COLUMN a_dummy NOPRINT' is used for what purpose?

'SELECT department_id, location, hire_date FROM employees UNION...' retrieves which columns?

'UNION' is an operator that performs what function between datasets?

More Like This

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SKASC 16 & 17: MINUS Operator in SQL