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Nested SQL
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Nested SQL : ウィキペディア英語版
Nested SQL

In relational databases, a nested table is a table that is embedded within another table.
Individual elements can be inserted, updated, and deleted in a nested table. Since individual elements can be modified in a nested table, they are more flexible than an array because elements in an array can only be modified as a whole, not individually.
A nested table doesn't have a maximum size, and an arbitrary number of elements can be stored in it.
A nested table is not in first normal form.
==See also==

*Query optimizer

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Nested SQL」の詳細全文を読む



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