| 4.14 Tables |
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| A table is a collection of rows having one or more columns. [...] |
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| A table is either a base table, a derived table, or a transient table. A base table is either a persistent base table, a global temporary table, a created local temporary table, or a declared local temporary table. |
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| A derived table is a table derived directly or indirectly from one or more other tables by the evaluation of a <query expression> whose result has an element type that is a row type. The values of a derived table are derived from the values of the underlying tables when the <query expression> is evaluated. |
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| A derived table descriptor describes a derived table. In addition to the components of every table descriptor, a derived table descriptor includes: |
| - The <query expression> that defines how the table is to be derived. |
| - An indication of whether the derived table is updatable or not. |
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