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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 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
5/25 Which SQL data type is used to store fixed-length character strings?
- VARCHAR
- TEXT
- CHAR
- STRING
6/25 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)
7/25 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
8/25 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)
9/25 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
10/25 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
11/25 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.
12/25 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.
13/25 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
14/25 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
15/25 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
16/25 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
17/25 In SQL, which command is used to change the structure of a table such as adding a column or changing a column type?
- MODIFY TABLE
- CHANGE TABLE
- ALTER TABLE
- UPDATE TABLE
18/25 What does the SQL 'UNION' operator do?
- Joins the contents of two tables side by side
- Combines the results of two or more SELECT statements into a single result set
- Updates one table based on the contents of another
- Deletes records in one table based on the contents of another
19/25 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
20/25 Which of the following is a valid type of SQL join?
- CROSS JOIN
- REVERSE JOIN
- OUTER JOIN
- LINK JOIN
- RIGHT JOIN
21/25 In SQL, what is a subquery?
- A query within another query
- A function used to pass parameters to a query
- A method to rename a query
- A special operator to join queries
22/25 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'
23/25 How can you insert multiple rows into a table named 'Orders'?
- INSERT INTO Orders VALUES (value1, value2), (value3, value4)
- INSERT MULTIPLE INTO Orders VALUES (value1, value2), (value3, value4)
- ADD INTO Orders VALUES (value1, value2), (value3, value4)
- INSERT INTO Orders VALUES (value1, value2) AND (value3, value4)
24/25 Which SQL clause is used to sort the result set in ascending or descending order?
- SORT BY
- ORDER BY
- ARRANGE BY
- SEQUENCE BY
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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