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SQL Basics

1/25 What SQL keyword is applied for sorting the result-set?
- SORT BY
- ORDER
- ORDER BY
- SORT
2/25 What SQL statement is used to extract data from a database?
- GET
- OPEN
- EXTRACT
- SELECT
3/25 Once AUTOCOMMIT is set on, changes will be made automatically at the end of every SQL statement.
- True
- False
4/25 Which of the following is true about CASE SQL statement?
- A way to establish an IF-THEN-ELSE in SQL.
- A way to establish a loop in SQL.
- A way to establish a data definition in SQL.
- All of the above.
5/25 What does AVG SQL return?
- The maximum value from a column.
- The sum of values in a column.
- The average of the values in a group.
6/25 How do you use a subquery to find names of customers who have placed orders in an 'Orders' table?
- SELECT Name FROM Customers WHERE CustomerID IN (SELECT CustomerID FROM Orders)
- SELECT CustomerID FROM Orders WHERE Name IN (SELECT Name FROM Customers)
- SELECT Name FROM Customers WHERE EXISTS (SELECT CustomerID FROM Orders)
- SELECT Name FROM Customers JOIN Orders ON Customers.CustomerID = Orders.CustomerID
7/25 Which SQL data type is used to store fixed-length character strings?
- VARCHAR
- TEXT
- CHAR
- STRING
8/25 What is the purpose of the 'LIKE' operator in SQL?
- To compare a value to similar values using wildcard operators.
- To check for exact matches in a column.
- To perform mathematical operations.
- To limit the number of rows returned in a query.
9/25 Which of the following is a valid SQL aggregate function?
- COLLECT()
- COMBINE()
- SUM()
- CONNECT()
10/25 In SQL, what does the 'BETWEEN' operator do?
- Checks whether a value lies within a specified range.
- Compares two values for equality.
- Sorts the result set between two columns.
- Divides the result set into two parts.
11/25 Which SQL statement is used to return the number of records in the 'Employees' table?
- COUNT(Employees)
- SELECT COUNT(*) FROM Employees
- GET NUMBER OF Employees
- SELECT ROWS FROM Employees
12/25 What is the result of the following query: SELECT COUNT(DISTINCT EmployeeName) FROM Employees?
- The total number of rows in the Employees table
- The number of unique employee names in the Employees table
- A syntax error
- The first unique employee name in the Employees table
13/25 Which SQL clause is used to filter the results of a GROUP BY operation?
- FILTER BY
- HAVING
- WHERE
- GROUP WHERE
14/25 What does the following SQL statement do: SELECT EmployeeName, SUM(Salary) OVER (PARTITION BY DepartmentID) FROM Employees?
- Summarizes the total salary for each department
- Displays an error as the syntax is incorrect
- Displays the sum of salaries within each department for each employee
- Calculates the overall sum of salaries in the Employees table
15/25 How do you delete a table named 'TemporaryData' only if it exists in the database?
- DROP TABLE IF EXISTS TemporaryData
- DELETE TABLE TemporaryData IF EXISTS
- REMOVE TABLE TemporaryData WHEN EXISTS
- DROP TABLE TemporaryData ONLY IF EXISTS
16/25 What is the primary purpose of the SQL 'INNER JOIN' clause?
- To combine rows from two or more tables based on a related column between them
- To retrieve rows that exist in one table but not in another
- To select all rows from both tables regardless of the match between columns
- To update records in one table based on values in another table
17/25 How do you find the total number of entries in a table named 'Orders'?
- FIND COUNT(*) FROM Orders
- SELECT COUNT(*) FROM Orders
- COUNT ALL FROM Orders
- TOTAL COUNT(*) IN Orders
18/25 In SQL, which command is used to change the structure of a table such as adding a column or changing a column type?
- MODIFY TABLE
- CHANGE TABLE
- ALTER TABLE
- UPDATE TABLE
19/25 How can you retrieve unique values from the column 'EmployeeName' of the 'Employees' table?
- SELECT DISTINCT EmployeeName FROM Employees
- SELECT UNIQUE EmployeeName FROM Employees
- GET ALL UNIQUE EmployeeName FROM Employees
- SELECT EmployeeName FROM Employees DISTINCT
20/25 Which of the following is a valid type of SQL join?
- CROSS JOIN
- REVERSE JOIN
- OUTER JOIN
- LINK JOIN
- RIGHT JOIN
21/25 Which SQL statement is used to return only distinct (different) values?
- SELECT UNIQUE column_name FROM table_name
- SELECT DISTINCT column_name FROM table_name
- SELECT DIFFERENT column_name FROM table_name
- SELECT column_name FROM table_name DISTINCT
22/25 In SQL, what is a subquery?
- A query within another query
- A function used to pass parameters to a query
- A method to rename a query
- A special operator to join queries
23/25 How do you select all records from a table named 'Customers' where the 'CustomerName' starts with 'A'?
- SELECT * FROM Customers WHERE CustomerName LIKE 'A%'
- SELECT * FROM Customers WHERE CustomerName = 'A*'
- SELECT * FROM Customers WHERE CustomerName STARTS WITH 'A'
- SELECT * FROM Customers WHERE CustomerName BEGINS WITH 'A'
24/25 Which SQL clause is used to sort the result set in ascending or descending order?
- SORT BY
- ORDER BY
- ARRANGE BY
- SEQUENCE BY
25/25 What is the function of the 'HAVING' clause in SQL?
- To specify a search condition for a group or an aggregate function used in SELECT statement
- To filter records before the GROUP BY clause
- To join multiple tables based on a condition
- To specify the order of records
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