What are the characteristics of the COALESCE function in Oracle?

1 year ago
Liam
1 minute

The COALESCE function in Oracle has the following characteristics:

  1. The COALESCE function is used to return the value of the first non-null expression.
  2. The COALESCE function can take multiple parameters separated by commas.
  3. The parameters of the COALESCE function can be of any data type, including NULL.
  4. The COALESCE function will evaluate the parameters in order and return the value of the first non-null parameter.
  5. If all parameters are NULL, the COALESCE function will return NULL.
  6. The COALESCE function can be nested to handle multiple expressions that may be NULL.
  7. The COALESCE function can be used within a query to handle any NULL values in the query results.
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