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IDENTITY column
Learn IDENTITY column in Oracle SQL through the exact construct, a dedicated example, a boundary case, and a mastery check.
IDENTITY column is an atomic Oracle SQL lesson inside Schema Objects. 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 IDENTITY column rather than on generic Oracle SQL syntax.
Topic-specific example
CREATE TABLE users(id NUMBER GENERATED ALWAYS AS IDENTITY PRIMARY KEY,email VARCHAR2(255));
Test IDENTITY column 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.