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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 Which SQL statement is applied for returning only different values?
- SELECT UNIQUE
- SELECT INDENTITY
- SELECT DIFFERENT
- SELECT DISTINCT
4/25 What SQL statement is used for inserting new data in a database?
- ADD RECORD
- ADD INTO
- INSERT INTO
- ADD NEW
5/25 Which SQL statement is used to delete data from a table?
- TRUNCATE
- DELETE
- REMOVE
6/25 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.
7/25 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.
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 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.
12/25 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)
13/25 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.
14/25 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
15/25 How can you combine results from multiple SELECT statements in SQL?
- USING UNION
- WITH COMBINE
- USING UNION ALL
- USING JOIN
- USING UNION or UNION ALL
16/25 What is the result of executing a SQL statement that includes a WHERE clause with a non-existent value?
- An error message.
- All records from the table.
- No records (an empty result set).
- The first record in the table.
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 Which SQL function is used to return the current date and time?
- GETDATE()
- CURRENT_TIMESTAMP
- NOW()
- DATETIME()
- TIMESTAMP()
19/25 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
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 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
22/25 What is the purpose of the SQL 'WITH' clause?
- To provide a temporary name to a table or a set of columns
- To define a temporary subquery block that can be used in a SELECT statement
- To specify the conditions for a join
- To initialize variables within an SQL query
23/25 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
24/25 Which of the following is a valid type of SQL join?
- CROSS JOIN
- REVERSE JOIN
- OUTER JOIN
- LINK JOIN
- RIGHT JOIN
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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