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SQL Basics

1/25 Which SQL statement is applied for updating data in a database?
- UPDATE
- SAVE AS
- MODIFY
- SAVE
2/25 What SQL statement is used for inserting new data in a database?
- ADD RECORD
- ADD INTO
- INSERT INTO
- ADD NEW
3/25 The primary - foreign key relations are implemented to
- cross-reference database tables.
- clean-up the database.
- to index the database.
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 Which of the following statements is true about systems information in an RDBMS?
- RDBMS stores database definition information in system-created tables.
- Such information can be accessed with SQL.
- Often, such information cannot be updated by a user.
- All of the above.
7/25 How else can the table columns be called?
- Attributes
- Fields
- Records
8/25 What does the TRUNCATE TABLE do?
- Deletes all rows from a table
- Deletes the table
- Checks if the table has primary key specified
9/25 Which of the terms below is used to describe a database that occupies magnetic storage in the terabyte range, as well as to describe a database that contains billons of table rows?
- Very Large Database
- Cold Fusion
- Holographic storage
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 How do you create a new table named 'Employees' with columns 'EmployeeID' (integer) and 'EmployeeName' (varchar)?
- CREATE TABLE Employees (EmployeeID int, EmployeeName varchar)
- NEW TABLE Employees (EmployeeID int, EmployeeName string)
- CREATE Employees (EmployeeID integer, EmployeeName text)
- TABLE Employees ADD (EmployeeID int, EmployeeName varchar)
12/25 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)
13/25 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.
14/25 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)
15/25 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.
16/25 Which of the following is a valid SQL aggregate function?
- COLLECT()
- COMBINE()
- SUM()
- CONNECT()
17/25 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.
18/25 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.
19/25 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
20/25 Which SQL clause is used to filter the results of a GROUP BY operation?
- FILTER BY
- HAVING
- WHERE
- GROUP WHERE
21/25 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
22/25 Which SQL clause is used to sort the result set in ascending or descending order?
- SORT BY
- ORDER BY
- ARRANGE BY
- SEQUENCE BY
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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