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JSON_VALUE
Learn JSON_VALUE in Oracle SQL through the exact construct, a dedicated example, a boundary case, and a mastery check.
JSON_VALUE is an atomic Oracle SQL lesson inside JSON & XML. The example uses the specific syntax, command, API, instruction, or language rule named by this lesson.
Study the construct itself, then change one relevant input and predict the result before running it. That keeps this lesson focused on JSON_VALUE rather than on generic Oracle SQL syntax.
Topic-specific example
SELECT JSON_VALUE(payload,'$.customer.id') FROM events;
Test JSON_VALUE with an empty result, NULL/missing value, duplicate key, or concurrent operation where relevant; database behavior should be verified at the boundary shown by this example.