INTERVIEW QUESTIONS ORACLE SQL PLUS DETAILS

Question: Explain the different types of joins

Answer: Join is a query which retrieves related columns or rows from multiple tables.Self Join - Joining the table with itself.Equi Join - Joining two tables by equating two common columns.Non-Equi Join - Joining two tables by equating two common columns.Outer Join - Joining two tables in such a way that query can also retrieve rows that do not have corresponding join value in the other table.

Join is a query which retrieves related columns or rows from multiple tables.Self Join - Joining the table with itself.Equi Join - Joining two tables by equating two common columns.Non-Equi Join - Joining two tables by equating two common columns.Outer Join - Joining two tables in such a way that query can also retrieve rows that do not have corresponding join value in the other table. Source: CoolInterview.com

Equi Join "="
Non Equi Join "<, >, <>""
Outer Join (Left, right, full)
self join
Cartesian Product
Anti Join ("NOT IN", "NOT EXISTS") Source: CoolInterview.com

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