Hierarchical Queries in Oracle PL SQL Interview Questions And Answers For Experience & Freshers | Interview Preparation

Hierarchical Queries in Oracle PL SQL Interview Questions And Answers For Experience & Freshers | Interview Preparation

In all relational databases we can also store hierarchical data. If you want to store hierarchical data then relational table must have minimum three columns and also in these three columns 2 columns must belong to same datatype and also having logical relation.

In oracle if we want to retrieve hierarchical data from a relational table then we are using following three clauses:

1) Level: level is a PSEUDO column which automatically assigns numbers to level in a tree structure. levels are also starting with level number 1.

2) Start with: using start with clause specifies starting condition within tree structure.

3) Connect by: using connect by clause we must specify relationship between hierarchical columns using prior operator.

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