Nested Table in Oracle PL SQL Interview Questions And Answers For Experienced & Freshers | Interview Preparation

Nested Table in Oracle PL SQL Interview Questions And Answers For Experienced & Freshers | Interview Preparation

Oracle 8.0 introduced nested table.
Nested table is unbound table which is used to store number of data items in a single unit.

In index by table we are not allow to add or remove indexes and it does not store permanently in database.
To overcome this problem oracle introduced extension of the index by table called nested table.
Nested tables stores permanently in oracle database by using SQL language and in PLSQL by using extend collection method.
In index by table we are allow to add or remove indexes. 

In nested table by default indexes are integers and also these indexes always start with 1.

Nested table having exists, extend, trim, first, last, prior, next, count, delete(index), delete(one index, another index), delete these collection methods.

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