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SQL Basics

1/25 What SQL keyword is applied for sorting the result-set?
- SORT BY
- ORDER
- ORDER BY
- SORT
2/25 Which SQL statement is used to delete data from a table?
- TRUNCATE
- DELETE
- REMOVE
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 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.
7/25 How else can the table columns be called?
- Attributes
- Fields
- Records
8/25 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
9/25 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
10/25 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
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 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
13/25 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)
14/25 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.
15/25 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
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 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
18/25 Which SQL clause is used to filter the results of a GROUP BY operation?
- FILTER BY
- HAVING
- WHERE
- GROUP WHERE
19/25 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
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 What is the primary purpose of the SQL 'INNER JOIN' clause?
- To combine rows from two or more tables based on a related column between them
- To retrieve rows that exist in one table but not in another
- To select all rows from both tables regardless of the match between columns
- To update records in one table based on values in another table
22/25 Which SQL function is used to return the largest value of the selected column?
- MAX()
- BIG()
- UPPER()
- TOP()
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 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 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
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