In general, OCI applications do not work with internal data type representations of data, but with host language data types that are predefined by the language in which they are written. Examples of internal data types include NUMBER, CHAR, and DATE (see Table 5-1). Internally, Oracle represents data in particular formats known as internal data types. Inside a database, values are stored in columns in tables. The OCI application may retrieve data from database tables through SQL SELECT queries, or it may modify existing data in tables through INSERT, UPDATE, or DELETE statements. One of the main functions of an OCI program is to communicate with an Oracle database.
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