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The COALESCE() function
The GREATEST() & LEAST() functions
The NULLIF() function
15. Summary


Nicely done! Now it's time to review what we've learned:

  • The IS NULL operator checks if a column value is NULL.
  • The IS NOT NULL operator checks if a column value is not NULL.
  • COALESCE(x, y, ...) returns the first non-NULL argument or replaces a NULL with the value given in the second argument.
  • The GREATEST() and LEAST() functions return the largest and the smallest value among values in the argument list, respectively.
  • The NULLIF(x, y) function returns NULL if x = y. Otherwise, it returns x.

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