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Mysolitaire Jewels Interview Questions and Answers

Updated 15 Aug 2024
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Q1. Can you explain the concept of ACID properties in DBMS?
Ans.

ACID properties in DBMS ensure data integrity and consistency in transactions.

  • ACID stands for Atomicity, Consistency, Isolation, Durability.

  • Atomicity ensures that either all operations in a transaction are completed successfully or none are.

  • Consistency ensures that the database remains in a valid state before and after the transaction.

  • Isolation ensures that multiple transactions can run concurrently without affecting each other.

  • Durability ensures that once a transaction is co...read more

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Q2. Can you explain how the HTTP protocol works?
Ans.

HTTP is a protocol used for transferring data over the internet.

  • HTTP stands for Hypertext Transfer Protocol.

  • It is a request-response protocol where a client sends a request to a server and the server responds with the requested data.

  • HTTP uses methods like GET, POST, PUT, DELETE to specify the action to be performed.

  • Headers are used to provide additional information about the request or response.

  • Status codes like 200 (OK), 404 (Not Found) are used to indicate the outcome of th...read more

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Q3. What are the different types of joins in SQL?
Ans.

Different types of joins in SQL include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

  • INNER JOIN: Returns rows when there is a match in both tables.

  • LEFT JOIN: Returns all rows from the left table and the matched rows from the right table.

  • RIGHT JOIN: Returns all rows from the right table and the matched rows from the left table.

  • FULL JOIN: Returns rows when there is a match in one of the tables.

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Q4. What is session state in HTTP?
Ans.

Session state in HTTP refers to the data stored on the server about a user's interactions during a session.

  • Session state allows the server to remember information about a user's interactions during a session.

  • It is typically stored in server-side memory or a database.

  • Session state is used to maintain user authentication, shopping cart contents, and other user-specific data.

  • Cookies are often used to maintain session state by storing a session ID on the client side.

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Discover Mysolitaire Jewels interview dos and don'ts from real experiences
Q5. What are constraints in SQL?
Ans.

Constraints in SQL are rules that are enforced on data columns in a table.

  • Constraints ensure data integrity by enforcing rules on data columns

  • Common constraints include NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK

  • Example: NOT NULL constraint ensures a column cannot have a NULL value

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Q6. What are triggers in SQL?
Ans.

Triggers in SQL are special stored procedures that are automatically executed when certain events occur in a database.

  • Triggers can be used to enforce business rules, maintain referential integrity, and automate tasks.

  • There are two main types of triggers: Before Triggers and After Triggers.

  • Example: A trigger can be set to automatically update a 'last_modified' column whenever a row is updated in a table.

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Q7. How to create python in session

Ans.

To create a Python session, you can use the 'requests' library to make HTTP requests and maintain session state.

  • Import the 'requests' library

  • Create a session object using 'requests.Session()'

  • Use the session object to make HTTP requests, which will automatically handle cookies and other session data

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Q8. How to update new PHP version

Ans.

To update PHP version, download the latest version from php.net, backup your files, update php.ini, and restart the server.

  • Download the latest PHP version from php.net

  • Backup your files before updating

  • Update php.ini configuration file

  • Restart the server to apply changes

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