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SYS_CONNECT_BY_PATH
Learn SYS_CONNECT_BY_PATH in Oracle SQL through the exact construct, a dedicated example, a boundary case, and a mastery check.
SYS_CONNECT_BY_PATH is an atomic Oracle SQL lesson inside Hierarchical & Analytic SQL. 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 SYS_CONNECT_BY_PATH rather than on generic Oracle SQL syntax.
Topic-specific example
SELECT SYS_CONNECT_BY_PATH(name,'/') path FROM categories START WITH parent_id IS NULL CONNECT BY PRIOR id=parent_id;
Test SYS_CONNECT_BY_PATH 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.