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It does not mean that the database will retrieve exactly to indicate that Oracle Database prohibits any changes to the table or view that would produce rows that are not included in the subquery.

When used in the subquery of a DML statement, you can specify this clause in a subquery in the can be a subquery, a column, a function, or a collection constructor.

You can use the schema qualifier to select from a table, view, or materialized view in a schema other than your own.

If you omit to retrieve past data from a table, view, or materialized view.

The output of a pivot operation typically includes more columns and fewer rows than the starting data set.

lets you write cross-tabulation queries that rotate rows into columns, aggregating data in the process of the rotation.You can optionally provide an alias for each pivot column value.If there is no alias, the column heading becomes a quoted identifier. When you specify a subquery, all values found by the subquery are used for pivoting.This clause implements SQL-driven Flashback, which lets you specify a different system change number or timestamp for each object in the select list.You can also implement session-level Flashback using the to retrieve multiple versions of the rows returned by the query.