MySQL
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  1. What MySQL returns if we use UNIX_TIMESTAMP() function with no argument?

  2. What is the use of MySQL FROM_UNIXTIME() function?

  3. In MySQL, how can we use FROM_UNIXTIME() function with format string?

  4. What is the significance of using multiple columns in MySQL GROUP BY clause?

  5. What happens if the output of MySQL TIMEDIFF() function surpass the range value of TIME field?

  6. How Groups function can be used in MySQL SELECT clause?

  7. What is the difference between UNIX TIMESTAMPS and MySQL TIMESTAMPS?

  8. How can we use group functions with non-group fields in MySQL SELECT query?

  9. In MySQL, how can we represent the time value as an integer?

  10. What MySQL will return on adding microseconds in the timestamp value for converting it into an integer?

  11. What is the proper way to retrieve the value stored in INT column as MySQL TIMESTAMP?

  12. On passing an out-of-range value in UNIX_TIMESTAMP() or FROM_UNIXTIME() function, what MySQL will return?

  13. Why should we not use group functions with non-group fields without GROUP BY clause in MySQL SELECT query?

  14. How can we know the repetition of a value in column with the help of group function COUNT(*) and GROUP BY clause?

  15. How can we sort MySQL output in ascending order?

  16. What MySQL returns if I write only one value in the enclosed set of unit values for compound INTERVAL unit?

  17. What MySQL returns if I use enclosed set of unit values with INTERVAL keyword?

  18. How to sort MySQL output on the basis of the column which is not in the result set?

  19. What MySQL returns if we include time components along with date component as an argument to DATEDIFF() function?

  20. How can we use MySQL SELECT statement to count number of rows in a table?
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