Sql Interview Question and Answers

16. Define Joins?
  A Join combines columns and data from two or more tables (and in rare cases, of one table with itself).
 
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17. What are the types of Joins?
 
  • Equi joins
  • Cartesian Joins
  • Outer Joins
  • Self Joins.
 
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18. Define Equi Joins?
  A Equi Join is a join in which the join comparison operator is an equality. When two tables are joined together using equality or values in one or more columns, they make an Equi Join.
 
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19. Define Cartesian Join?
  Joining two tables without a whereclause produces a Cartesian join which combines every row in one table with every row in another table.
 
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20. What are three SQL keywords used to change or set someone's permissions?
  GRANT, DENY, and REVOKE
 
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