MySQL
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  1. How many groups of data types are supported by MySQL?

  2. What happens if I will delete a row from MySQL parent table?

  3. How can we drop UNIQUE constraint from a MySQL table?

  4. How can we create multicolumn UNIQUE indexes?

  5. How can we remove multicolumn UNIQUE indexes?

  6. What happens if I will add a UNIQUE constraint on the same column for multiple times?

  7. What do you mean by PRIMARY KEY and how can we use it in MySQL table?

  8. How can I define a column of a MySQL table PRIMARY KEY without using the PRIMARY KEY keyword?

  9. How can we apply the PRIMARY KEY constraint to the field of an existing MySQL table?

  10. How can we remove PRIMARY KEY constraint from a column of an existing MySQL table?

  11. What happens if I will try to drop PRIMARY KEY constraint from the AUTO_INCREMENT column?

  12. How can we set PRIMARY KEY on multiple columns of a MySQL table?

  13. What are MySQL constraints?

  14. What is MySQL NOT NULL constraint and how can we declare a field NOT NULL while creating a table?

  15. How can we apply a NOT NULL constraint to a column of an existing MySQL table?

  16. What happens when we apply NOT NULL constraint, with ALTER TABLE statement, to a column contains NULL values?

  17. How can we remove NOT NULL constraint from a column of an existing MySQL table?

  18. How to insert NULL keyword as a value in a character type column of MySQL table having NOT NULL constraint?

  19. What is MySQL UNIQUE constraint and how can we apply it to the field of a table?

  20. How can we apply UNIQUE constraint to the field of an existing MySQL table?
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