Question: How to define my DBTIME2-column with required precision and scale (13/4)? With this settings, MSSQL 2008 can to work (read/write) with my DBTIME2-column. I change the Precision to 16 and Scale to 7 (as in SQLNCLI) "LENGTH" at compile time: 5, at execute time: 4. OLE DB "LCPI.IBProvider.3" "IBP_TEST_FB25_v3". When I try to work with this DBTIME2-column through linked server, MSSQL 2008 returns the error: In Oracle 10 g, you can write to external tables.I added to my OLEDB provider (for IB/FB) the support of DBTYPE_DBTIME2 (from MSSQL Native Client)įB/IB supports a data type "TIME" with four digit in fraction of second. Oracle 9 i introduced external tables read-only from the Oracle database. OCP: Oracle 10g New Features for Administrators Study Guide: Exam 1Z0-040. One can think of an external table as a view that allows running SQL queries against files on a filesystem.
Data is loaded from a file via an access driver (normally ORACLE_LOADER) when the table is accessed. An external table is a table that is NOT stored within the Oracle database. You can also use external tables to query data in text files that are not in an Informix database. You use external tables to load and unload data to or from your database.
External tables (in Informix įor example) can also be thought of as views. Views also function as relational tables, but their data are calculated at query time. The data in a table does not have to be physically stored in the database. Besides the actual data rows, tables generally have associated with them some metadata, such as constraints on the table or on the values within particular columns. "Table" is another term for "relation" although there is the difference in that a table is usually a multiset (bag) of rows where a relation is a set and does not allow duplicates. A specific choice of columns which uniquely identify rows is called the primary key. Each row is identified by one or more values appearing in a particular column subset. A table has a specified number of columns, but can have any number of rows.
In relational databases, and flat file databases, a table is a set of data elements (values) using a model of vertical columns (identifiable by name) and horizontal rows, the cell being the unit where a row and column intersect.