How does Oracle determine if a field value is empty?

2 years ago
Liam
1 minute

In Oracle, you can determine if a field value is empty using the following methods:

  1. Using the IS NULL operator:
    SELECT * FROM table_name WHERE column_name IS NULL;
    This will retrieve all records where the value of the column_name field is empty.
  2. The IS NOT NULL operator is used to select all records in which the column_name field is not empty.
  3. Using the NVL function:
    The NVL function can return a default value when the field value is empty, which can be used to determine if the field value is empty.
    SELECT * FROM table_name WHERE NVL(column_name, ”) = ”;
    This will return all records where the column_name field value is empty.
  4. You can use a CASE statement to check if a field value is empty and perform operations based on the result. The query will return a result set with the column_name and result fields, with the result column indicating whether the field value is empty.
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