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Oracle SQL Complete Course / Hierarchical & Analytic SQL

CONNECT_BY_ROOT

Learn CONNECT_BY_ROOT in Oracle SQL through the exact construct, a dedicated example, a boundary case, and a mastery check.

10 min read • Intermediate

CONNECT_BY_ROOT 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 CONNECT_BY_ROOT rather than on generic Oracle SQL syntax.

Topic-specific example

oraclesql-03-05.sql
sql Try It Live 
SELECT CONNECT_BY_ROOT name root_name,name FROM categories START WITH parent_id IS NULL CONNECT BY PRIOR id=parent_id;
Edge case / engineering note

Test CONNECT_BY_ROOT 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.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

CONNECT_BY_ROOT Mastery Check →
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SYS_CONNECT_BY_PATH
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ROW_NUMBER analytic