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SQL Basics

1/25 With SQL, how do you select all the columns from a table named "Products"?
- SELECT [all] FROM Products
- SELECT All Products
- SELECT *.Products
- SELECT * FROM Products
2/25 What SQL keyword is applied for sorting the result-set?
- SORT BY
- ORDER
- ORDER BY
- SORT
3/25 What SQL statement is used for inserting new data in a database?
- ADD RECORD
- ADD INTO
- INSERT INTO
- ADD NEW
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 Which of the following statements is true about embedded SQL?
- Hard-coded SQL statements in a program language such as Java.
- The process of making an application capable of generating specific SQL code on the fly.
- Hard-coded SQL statements in a procedure.
- Hard-coded SQL statements in a trigger.
- Embedded SQL is applied for returning data that will be used in the main query as a condition.
6/25 How else can the table columns be called?
- Attributes
- Fields
- Records
7/25 Which of the SQL statements below deletes all the rows in a table called PricesData?
- DELETE ALL PricesData
- DELETE PricesData
- DELETE FROM PricesData
- DELETE rows FROM PricesData
8/25 Can the SELECT clause list have a computed value like in the example below? SELECT CustomerName, UnitPrice * NumberofUnits FROM Sale.
- No
- Yes
9/25 Which of the following is an open standard application programming interface(API) for accessing a database?
- Topic Map Query Language
- Open Database Connectivity
- Open Data-Link Interface
- Universal Data Access
10/25 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
11/25 Which SQL statement adds a 'Salary' column to the 'Employees' table?
- ALTER TABLE Employees ADD COLUMN Salary int
- UPDATE TABLE Employees ADD Salary int
- MODIFY TABLE Employees ADD Salary int
- INSERT INTO Employees (Salary) VALUES (int)
12/25 What is the purpose of constraints in SQL?
- To limit the type of data that can be stored in a column.
- To join tables together based on a condition.
- To sort the data in ascending or descending order.
- To group data based on column values.
13/25 How do you use the GROUP BY clause in conjunction with aggregate functions?
- SELECT COUNT(EmployeeID), Department FROM Employees GROUP BY Department
- GROUP Employees BY Department WITH COUNT(EmployeeID)
- SELECT Department, COUNT(EmployeeID) FROM Employees GROUP BY EmployeeID
- SELECT Department FROM Employees GROUP BY COUNT(EmployeeID)
14/25 What does the SQL clause 'LIMIT 10' do when added to a SELECT statement?
- Limits the result to the first 10 rows.
- Selects only the 10th row.
- Limits each column to 10 characters.
- Throws an error as 'LIMIT' is not a valid SQL clause.
15/25 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.
16/25 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
17/25 How do you perform a LEFT JOIN between 'Employees' and 'Departments' tables on the 'DepartmentID' column?
- SELECT * FROM Employees LEFT JOIN Departments ON Employees.DepartmentID = Departments.DepartmentID
- JOIN Employees, Departments USING (DepartmentID)
- SELECT * FROM Employees, Departments WHERE Employees.DepartmentID = Departments.DepartmentID
- SELECT * FROM Employees JOIN Departments ON DepartmentID
18/25 How do you rename a column 'EmployeeName' to 'FullName' in the 'Employees' table?
- ALTER TABLE Employees RENAME COLUMN EmployeeName TO FullName
- UPDATE TABLE Employees CHANGE EmployeeName FullName
- ALTER TABLE Employees MODIFY COLUMN EmployeeName AS FullName
- RENAME COLUMN EmployeeName TO FullName IN Employees
19/25 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
20/25 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
21/25 What is the purpose of the 'GROUP BY' clause in SQL?
- To group rows that have the same values in specified columns into summary rows
- To group the output of a SQL query by the values of a specific column
- To sort the result set of a query by the specified column values
- To filter rows based on the condition specified by the aggregate function
22/25 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
23/25 How do you find the minimum value in a column named 'Price' from the 'Products' table?
- SELECT MIN(Price) FROM Products
- FIND MINIMUM(Price) IN Products
- SELECT LOWEST(Price) FROM Products
- GET MIN(Price) FROM Products
24/25 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
25/25 What does the SQL 'CROSS JOIN' clause do?
- Joins two tables in such a way that each row of the first table is combined with each row of the second table
- Joins only the matching rows between two tables
- Creates a join that can be filtered using a WHERE clause
- Combines rows from two tables based on a related column
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