MySQL
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  1. How can SELECT, without reference to any table, be used to calculate expression in MySQL?

  2. How can we create and use a MySQL trigger?

  3. How can we discard a MySQL statement in the middle of its processing?

  4. What are the advantages, disadvantages and restrictions of using MySQL triggers?

  5. What is the use of the LIMIT keyword in MySQL query?

  6. What is the meaning of ‘empty set’ in MySQL result set?

  7. What will happen to MySQL current transaction, if in the middle of that transaction, the DDL statement is executed?

  8. What will happen to the current MySQL transaction if a START TRANSACTION command is executed in the middle of that current transaction?

  9. Why in MySQL, we cannot use arithmetic operators like ‘=’, ‘<’ or ‘<>’ with NULL?

  10. What is the benefit of MySQL ‘IS NULL’ and ‘IS NOT NULL’?

  11. How it is possible to insert a zero or an empty string into a MySQL column which is defined as NOT NULL?

  12. Why it shows 0 instead of empty string whenever I insert an empty string into a MySQL column which is declared as NOT NULL?

  13. How can we check the current MySQL transaction isolation level?

  14. What role data type plays when I insert an empty string into a MySQL column which is declared as NOT NULL?

  15. How can I get the output of multiple MySQL tables from a single query?

  16. How can we use MySQL SELECT without FROM clause?

  17. How changes, made in the current transaction, can be permanently recordedin MySQL database?

  18. How changes, made in the current transaction, can be permanently eliminated from MySQL database?

  19. What happens if I use both \G and semicolon (;) termination symbol with a single MySQL statement?

  20. How can I combine built-in-commands (\g and \G), used for executing a MySQL statement, with termination symbol semicolon (;) to get output without any error?

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