Maximum size is determined by the national character set definition, with an upper limit of:ģ2767 bytes if MAX_STRING_SIZE = EXTENDED The number of bytes can be up to two times size for AL16UTF16 encoding and three times size for UTF8 encoding. Variable-length Unicode character string having maximum length size characters. CHAR indicates that the column will have character semantics. Refer to "Extended Data Types" for more information on the MAX_STRING_SIZE initialization parameter.īYTE indicates that the column will have byte length semantics. Maximum size is:ģ2767 bytes or characters if MAX_STRING_SIZE = EXTENDEDĤ000 bytes or characters if MAX_STRING_SIZE = STANDARD Variable-length character string having maximum length size bytes or characters.
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Table 2-1 Built-in Data Type Summary Code For descriptions, refer to "Oracle-Supplied Types".ĭescription of the illustration ''oracle_supplied_types.gif''ĭescription of the illustration ''any_types.gif''įor descriptions of the Any types, refer to "Any Types".ĭescription of the illustration ''xml_types.gif''įor descriptions of the XML types, refer to "XML Types".ĭescription of the illustration ''spatial_types.gif''įor descriptions of the spatial types, refer to "Spatial Types".ĭescription of the illustration ''media_types.gif''ĭescription of the illustration ''still_image_object_types.gif''įor descriptions of the media types, refer to "Media Types". The Oracle-supplied data types appear in the figures that follows. "ANSI, DB2, and SQL/DS Data Types" discusses the mapping of ANSI-supported data types to Oracle built-in data types.ĭescription of the illustration ''ansi_supported_datatypes.gif''įor descriptions of user-defined types, refer to "User-Defined Types". The ANSI-supported data types appear in the figure that follows. For descriptions, refer to "Oracle Built-in Data Types".ĭescription of the illustration ''oracle_built_in_datatypes.gif''ĭescription of the illustration ''character_datatypes.gif''ĭescription of the illustration ''number_datatypes.gif''ĭescription of the illustration ''long_and_raw_datatypes.gif''ĭescription of the illustration ''datetime_datatypes.gif''ĭescription of the illustration ''large_object_datatypes.gif''ĭescription of the illustration ''rowid_datatypes.gif'' The Oracle built-in data types appear in the figures that follows. For information on external data types, including how Oracle converts between them and built-in data types or user-defined types, see Pro*COBOL Programmer's Guide, and Pro*C/C++ Programmer's Guide.ĭescription of the illustration ''datatypes.gif'' Do not confuse built-in data types and user-defined types with external data types. These data types are called external data types and are associated with host variables. The Oracle precompilers recognize other data types in embedded SQL programs.
Those restrictions are documented in the context of the relevant SQL syntax. LOBs are subject to some restrictions that do not affect other scalar types because of their size. A large object (LOB) is a special form of scalar data type representing a large scalar value of binary or character data. A scalar type contains an atomic value, whereas a nonscalar (sometimes called a "collection") contains a set of values. The text of this section is divided into the following sections:Ī data type is either scalar or nonscalar. The syntax of Oracle data types appears in the diagrams that follow. Oracle Database provides a number of built-in data types as well as several categories for user-defined types that can be used as data types. For example, if you insert '01-JAN-98' into a DATE column, then Oracle treats the '01-JAN-98' character string as a DATE value after verifying that it translates to a valid date. Each value subsequently placed in a column assumes the data type of the column.
For example, DATE columns cannot accept the value February 29 (except for a leap year) or the values 2 or 'SHOE'. These data types define the domain of values that each column can contain or each argument can have. When you create a procedure or stored function, you must specify a data type for each of its arguments. When you create a table or cluster, you must specify a data type for each of its columns.
For example, you can add values of NUMBER data type, but not values of RAW data type. These properties cause Oracle to treat values of one data type differently from values of another. The data type of a value associates a fixed set of properties with the value. Each value manipulated by Oracle Database has a data type.
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