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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 Which SQL statement is applied for updating data in a database?
- UPDATE
- SAVE AS
- MODIFY
- SAVE
3/25 What SQL statement is used for inserting new data in a database?
- ADD RECORD
- ADD INTO
- INSERT INTO
- ADD NEW
4/25 Once AUTOCOMMIT is set on, changes will be made automatically at the end of every SQL statement.
- True
- False
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 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
7/25 What does the TRUNCATE TABLE do?
- Deletes all rows from a table
- Deletes the table
- Checks if the table has primary key specified
8/25 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
9/25 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)
10/25 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.
11/25 What is the purpose of a view in SQL?
- To create a virtual table based on the result-set of an SQL statement.
- To insert new rows into a table.
- To define new data types.
- To permanently store data.
12/25 What does the SQL statement 'BEGIN TRANSACTION' do?
- Starts a new SQL transaction.
- Creates a new table called TRANSACTION.
- Begins a new subquery.
- Starts a new index creation process.
13/25 Which SQL statement is used to set a default value for a column?
- SET DEFAULT
- ALTER TABLE ... SET DEFAULT
- MODIFY COLUMN ... DEFAULT
- UPDATE COLUMN ... SET DEFAULT
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 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
17/25 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
18/25 Which SQL statement is used to change the data type of a column in an existing table?
- ALTER TABLE table_name MODIFY column_name new_data_type
- UPDATE TABLE table_name SET column_name TYPE new_data_type
- CHANGE TABLE table_name column_name new_data_type
- MODIFY TABLE table_name column_name SET TYPE new_data_type
19/25 Which statement is used to add a new row to a table in SQL?
- ADD ROW INTO tableName (column1, column2) VALUES (value1, value2)
- INSERT INTO tableName (column1, column2) VALUES (value1, value2)
- CREATE ROW IN tableName (column1, column2) VALUES (value1, value2)
- APPEND INTO tableName (column1, column2) VALUES (value1, value2)
20/25 Which statement correctly shows the use of an alias in SQL?
- SELECT EmployeeID AS ID FROM Employees
- SELECT EmployeeID RENAME ID FROM Employees
- SELECT EmployeeID -> ID FROM Employees
- SELECT EmployeeID NAME ID FROM Employees
21/25 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
22/25 What does the SQL 'UNION' operator do?
- Joins the contents of two tables side by side
- Combines the results of two or more SELECT statements into a single result set
- Updates one table based on the contents of another
- Deletes records in one table based on the contents of another
23/25 Which of the following is a valid type of SQL join?
- CROSS JOIN
- REVERSE JOIN
- OUTER JOIN
- LINK JOIN
- RIGHT JOIN
24/25 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
25/25 Which SQL clause is used to sort the result set in ascending or descending order?
- SORT BY
- ORDER BY
- ARRANGE BY
- SEQUENCE BY
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