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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 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 The primary - foreign key relations are implemented to
- cross-reference database tables.
- clean-up the database.
- to index the database.
7/25 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.
8/25 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.
9/25 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.
10/25 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
11/25 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
12/25 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)
13/25 How do you create an index on the 'EmployeeName' column of the 'Employees' table for faster queries?
- CREATE INDEX ON Employees (EmployeeName)
- INDEX Employees ADD EmployeeName
- ADD INDEX EmployeeName ON Employees
- CREATE Employees INDEX EmployeeName
14/25 How can you lock a table 'Employees' for read and write operations to maintain data integrity?
- LOCK TABLE Employees READ, WRITE
- SET LOCK ON Employees
- EMPLOYEES LOCK SET READ, WRITE
- TABLE Employees SET LOCK
15/25 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)
16/25 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.
17/25 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.
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 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 of the following is NOT a valid aggregate function in SQL?
- SUM()
- AVERAGE()
- MAX()
- COUNT()
21/25 Which SQL clause is used to specify a condition while fetching data from a single table or joining multiple tables?
- HAVING
- WHERE
- ON
- AND
22/25 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
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 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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