Indows soft solutions experience 2 years in my sql
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The document contains 29 questions about various MySQL concepts including: 1. BLOBs store binary large objects and are used to store files like images or documents. 2. VARCHAR is variable length while CHAR is fixed length, VARCHAR is better if lengths vary but CHAR is better if fixed or mostly fixed. 3. A self referencing foreign key is a foreign key that references its own table's primary key, used to represent hierarchies.
Indows soft solutions experience 2 years in my sql
- 1. 1.Describe BLOB in MySQL. What is it used for? 2. How are VARCHAR and CHAR different. Talk about cases where you will use one over other. 3. What is self referencing foreign key? Give an example. 4. What is the difference between Data Definition Language (DDL) and Data Manipulation Language (DML)? 5. What is the difference between TRUNCATE and DELETE? 6. Both TIMESTAMP and DATETIME are used to store data and time. Explain difference between them and when should one be used? 7. Explain GRANT command in MySQL 8. Explain the use of FEDERATED tables in MySQL 9. How can ENUM be used in MySQL. Give an example. 10. What are different TEXT data types in MySQL. What is difference between TEXT and VARCHAR? 11. What different stored objects are supported in MySQL? 12. What is AUTO INCREMENT in MySQL? Explain with an example. 13. What is Stored Function in MySQL. How are they different from Stored Procedure? 14. What is difference between BLOB and TEXT in MySQL? 15. What is the difference between commands create database and create schema in MySQL? 16. What is the use of DELIMETER command in MySQL? 17. A multiple column index is created over firstName, lastName, city columns of a Customer table. Will this index be used for SELECT queries based on only first_name, only last_name or only city values? 18. Compare MySQL and PostgresSQL
- 2. 19. Provide an example of UPSERT logic using MySQL 20. What are differences between MyISAM and InnoDB database engines commonly used in MySQL? 21.What are some major differences between MySQL and Oracle database? 22. What does OPTIMIZE TABLE command do in MySQL? 23. What is autocommit in MySQL? Can you run a transaction without disabling autocommit? 24. What is cursor used in MySQL? What are properties of MySQL cursor? 25. What is database engine or storage engine? Mention few storage engines supported by MySQL and their use. 26. Which partitioning types does MySQL support? 27. How many tables can a trigger associate to in MySQL? Can a trigger be associated to a view? 28. What is difference between horizontal and vertical partitioning? Does MySQL supportboth horizontal and vertical partitioning? 29. What is the use of SAVEPOINT in MySQL