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If you need to support multiple databases which use different data-types for your field-data, we need to let the database know how to map this attributes using a nested tuple.
Each database index is a 2-tuple, the first part of which is a tuple of the names of the fields, the second part a boolean indicating whether the index should be unique. Since, with our uuid example, the database driver won’t generate a new ID, we need to specify it manually.
When you use this form, a table is physically created as the statement is executed.
The newly created table does not reflect subsequent changes in the underlying tables (in the query-expression).
The specified columns are dropped when the table is created. It is a convenient way to create temporary tables that are subsets or supersets of other tables.If you want to continually access the most current data, then create a view from the query expression instead of a table. While it is possible to recursively reference the target table of a CREATE TABLE AS statement, doing so can cause data integrity problems and incorrect results.Constructions such as the following should be avoided: You can attach integrity constraints when you create a new table.The first form of the CREATE TABLE statement creates tables that automatically map SQL data types to tables that are supported by SAS.Use this form when you want to create a new table with columns that are not present in existing tables.