SQL Operators Quiz and Query Skills Test

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Questions and Answers

What is the primary function of the SQL NOT operator in a query?

To sort the results in descending order
To filter only those rows that do not meet the conditions mentioned in the WHERE clause (correct)
To filter rows that meet the conditions mentioned in the WHERE clause
To combine two or more conditions in the WHERE clause

What is the purpose of the SQL BETWEEN operator?

To test if an expression is within a range of values (correct)
To sort the results in ascending order
To combine multiple conditions in a WHERE clause
To filter out rows that meet the conditions mentioned in the WHERE clause

What is the correct syntax for using the NOT operator in a query?

SELECT column_name(s) FROM table_name WHERE condition;
SELECT column_name(s) FROM table_name WHERE NOT condition; (correct)
SELECT column_name(s) FROM table_name WHERE NOT;
SELECT column_name(s) FROM table_name WHERE condition NOT;

What is the result of combining NOT and AND operators in a query?

The query returns only those rows that meet both the conditions mentioned in the WHERE clause (A) Signup and view all the answers

What is the difference between the SQL AND and OR operators?

The AND operator is used to combine multiple conditions, while the OR operator is used to filter out rows that do not meet the conditions (B) Signup and view all the answers

What is the purpose of the SQL logical operators in a query?

To combine multiple conditions in a WHERE clause for filtering rows (A) Signup and view all the answers

What is the purpose of the WHERE clause in SQL?

To filter records based on a specified condition. (A) Signup and view all the answers

Which of the following is NOT a component of a WHERE clause?

Aggregate functions. (B) Signup and view all the answers

What happens when the condition in the WHERE clause returns false?

No records are returned. (A) Signup and view all the answers

Which SQL clause is used to sort records in ascending or descending order?

ORDER BY clause. (C) Signup and view all the answers

What is the purpose of the HAVING clause in SQL?

To specify conditions for groups of records. (D) Signup and view all the answers

How many kinds of SQL Clauses are there in MySQL Server?

5 (B) Signup and view all the answers

What is the purpose of the UNIQUE operator in SQL?

To search every row of a specified table for uniqueness (no duplicates) (C) Signup and view all the answers

What is the function of the NOT operator in SQL?

To reverse the meaning of the logical operator with which it is used (A) Signup and view all the answers

What is the purpose of the IS NULL operator in SQL?

To compare a value with a NULL value (C) Signup and view all the answers

Which SQL clause is used to request specific information from a database table?

MySQL queries (A) Signup and view all the answers

What is the purpose of the OR operator in SQL?

To combine multiple conditions in an SQL statement's WHERE clause (D) Signup and view all the answers

What is the purpose of arithmetic operators in SQL?

To perform calculations and manipulate data in SQL statements (B) Signup and view all the answers

What is the purpose of the SQL IN operator?

To select data that matches a list of values. (D) Signup and view all the answers

What is the result of the query SELECT * FROM Employee Where sal IN(50000,60000,70000)?

All employees with salaries equal to 50000, 60000, or 70000. (C) Signup and view all the answers

What is the difference between the SQL IN operator and the BETWEEN operator?

The IN operator is used for a list of values, while the BETWEEN operator is used for a range of values. (B) Signup and view all the answers

What is the purpose of the SQL BETWEEN operator?

To select data from a specific date range. (B) Signup and view all the answers

What happens when a field in a table is optional and no value is inserted?

The field will be saved with a NULL value. (D) Signup and view all the answers

What is a NULL value in a database?

A field with no value. (C) Signup and view all the answers

What is the purpose of the SQL WHERE clause?

To specify a condition while fetching data from a single table or joining with multiple tables. (D) Signup and view all the answers

What is the purpose of the SQL AND logical operator?

To combine two or more conditions mentioned in a WHERE clause of a query. (D) Signup and view all the answers

What is the SQL syntax to fetch all records from a table where the 'birthdate' is less than '2000-01-01'?

SELECT * FROM table_name WHERE birthdate < '2000-01-01' (D) Signup and view all the answers

What is the correct SQL query to fetch all records from the 'Employee' table where the 'Salary' is not equal to $60,000?

SELECT * FROM Employee WHERE Salary != 60,000; (B) Signup and view all the answers

What is the purpose of the SQL WHERE clause in an UPDATE statement?

To specify a condition for which records to update. (C) Signup and view all the answers

What is the correct SQL syntax to fetch all records from a table where the 'id' is greater than 2?

SELECT * FROM table_name WHERE id > 2; (D) Signup and view all the answers

Study Notes

SQL WHERE Clause

The SQL WHERE clause is used to specify a condition while fetching data from a single table or joining with multiple tables.
The syntax is: SELECT columns FROM table_name WHERE [condition].
Examples:
- SELECT * FROM info WHERE address = 'Akre';
- SELECT * FROM info WHERE id > 2;
- SELECT * FROM info WHERE id <= 2;
- SELECT * FROM info WHERE birthdate < '2000-01-01';

SQL Operators

SQL Comparison Operators

Examples:
- SELECT * FROM Employee WHERE Salary = 60000;
- SELECT * FROM Employee WHERE Salary != 60000;

SQL Logical Operators

AND Logical Operator:
- Used to combine two or more conditions in a WHERE clause.
- Example: SELECT Customer_name FROM Orders WHERE Items_purchased = 'pencil' OR Items_purchased = 'eraser' AND City = 'London';
NOT Logical Operator:
- Used to filter only those rows that do not meet the conditions mentioned in the WHERE clause.
- Example: SELECT * FROM Orders WHERE NOT Items_purchased = 'pencil';
NOT – AND – OR Logical Operator:
- Example: SELECT * FROM Orders WHERE NOT MONTH(Order_date) = '2' AND Items_purchased = 'Books';

SQL Between Operators

The SQL BETWEEN condition allows testing if an expression is within a range of values (inclusive).
The values can be text, date, or numbers.
Example: SELECT * FROM Orders WHERE OrderDate BETWEEN '2023-01-01' AND '2023-01-07';

SQL IN Operators

The SQL IN operator is used to select data that matches any value in a list.
Example: SELECT * FROM Employee WHERE sal IN (50000, 60000, 70000);
Example: SELECT * FROM info WHERE address IN ('Hawler', 'Duhok');

SQL NULL Values

A NULL value is a field with no value.
If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field.
Then, the field will be saved with a NULL value.

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Test your knowledge of SQL operators such as LIKE, NOT, OR, IS NULL, and UNIQUE. Learn how to use them in SQL statements and practice with this quiz.

SQL Operators

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Questions and Answers

What is the primary function of the SQL NOT operator in a query?

What is the purpose of the SQL BETWEEN operator?

What is the correct syntax for using the NOT operator in a query?

What is the result of combining NOT and AND operators in a query?

What is the difference between the SQL AND and OR operators?

What is the purpose of the SQL logical operators in a query?

What is the purpose of the WHERE clause in SQL?

Which of the following is NOT a component of a WHERE clause?

What happens when the condition in the WHERE clause returns false?

Which SQL clause is used to sort records in ascending or descending order?

What is the purpose of the HAVING clause in SQL?

How many kinds of SQL Clauses are there in MySQL Server?

What is the purpose of the UNIQUE operator in SQL?

What is the function of the NOT operator in SQL?

What is the purpose of the IS NULL operator in SQL?

Which SQL clause is used to request specific information from a database table?

What is the purpose of the OR operator in SQL?

What is the purpose of arithmetic operators in SQL?

What is the purpose of the SQL IN operator?

What is the result of the query SELECT * FROM Employee Where sal IN(50000,60000,70000)?

What is the difference between the SQL IN operator and the BETWEEN operator?

What is the purpose of the SQL BETWEEN operator?

What happens when a field in a table is optional and no value is inserted?

What is a NULL value in a database?

What is the purpose of the SQL WHERE clause?

What is the purpose of the SQL AND logical operator?

What is the SQL syntax to fetch all records from a table where the 'birthdate' is less than '2000-01-01'?

What is the correct SQL query to fetch all records from the 'Employee' table where the 'Salary' is not equal to $60,000?

What is the purpose of the SQL WHERE clause in an UPDATE statement?

What is the correct SQL syntax to fetch all records from a table where the 'id' is greater than 2?

Study Notes

SQL WHERE Clause

SQL Operators

SQL Comparison Operators

SQL Logical Operators

SQL Between Operators

SQL IN Operators

SQL NULL Values

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