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What is connect by clause?
The CONNECT BY clause specifies the relationship between rows in a hierarchy. You can use CONNECT BY to select rows in a hierarchical order by joining the table to itself and processing the hierarchical data. For example, you can use it to recursively loop through an organization chart and list data.
How does connect by level work?
The CONNECT BY clause defines the hierarchical relationship between the parent rows and the child rows of the hierarchy. DUAL is a dummy table automatically generated by Oracle database along with data dictionary. Explanation: Above query will execute Level having initial value 1 from dual, which is dummy table.
What is connect by function in SQL?
The CONNECT BY clause specifies conditions for performing recursive operations in hierarchical queries. The CONNECT BY clause is an extension to the ANSI/ISO standard for SQL. This syntax fragment is part of the Hierarchical Clause.
