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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 to extract data from a database?
- GET
- OPEN
- EXTRACT
- SELECT
3/25 Which SQL statement is applied for returning only different values?
- SELECT UNIQUE
- SELECT INDENTITY
- SELECT DIFFERENT
- SELECT DISTINCT
4/25 Which SQL statement is used to delete data from a table?
- TRUNCATE
- DELETE
- REMOVE
5/25 The primary - foreign key relations are implemented to
- cross-reference database tables.
- clean-up the database.
- to index the database.
6/25 Once AUTOCOMMIT is set on, changes will be made automatically at the end of every SQL statement.
- True
- False
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 Can the SELECT clause list have a computed value like in the example below? SELECT CustomerName, UnitPrice * NumberofUnits FROM Sale.
- No
- Yes
10/25 What does the TRUNCATE TABLE do?
- Deletes all rows from a table
- Deletes the table
- Checks if the table has primary key specified
11/25 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
12/25 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
13/25 Which SQL data type is used to store fixed-length character strings?
- VARCHAR
- TEXT
- CHAR
- STRING
14/25 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)
15/25 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.
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 Which of the following is a valid SQL aggregate function?
- COLLECT()
- COMBINE()
- SUM()
- CONNECT()
18/25 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
19/25 Which SQL function is used to return the current date and time?
- GETDATE()
- CURRENT_TIMESTAMP
- NOW()
- DATETIME()
- TIMESTAMP()
20/25 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
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 How can you retrieve unique values from the column 'EmployeeName' of the 'Employees' table?
- SELECT DISTINCT EmployeeName FROM Employees
- SELECT UNIQUE EmployeeName FROM Employees
- GET ALL UNIQUE EmployeeName FROM Employees
- SELECT EmployeeName FROM Employees DISTINCT
23/25 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
24/25 In SQL, which command is used to add a new column to an existing table?
- ADD COLUMN column_name TO table_name
- INSERT COLUMN column_name INTO table_name
- ALTER TABLE table_name ADD column_name column_type
- UPDATE TABLE table_name SET ADD column_name column_type
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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