G - Physics – 06 – F
Patent
G - Physics
06
F
354/112, 354/230
G06F 15/40 (1990.01)
Patent
CA 1290455
AT9-88-010 ABSTRACT OF THE DISCLOSURE In the relational database system of the present invention, an extension to the SQL language is provid- ed to allow a user/application to specify whether a column in a database table contains only single byte character set data, or mixed single byte character set data and double byte character set data. Specifying whether a column contains single byte character set data or mixed data is achieved by specifying the subtype of the character data types including CHAR, VARCHAR, and LONG VARCHAR. The user application can specify the subtype of character data within a column as the column is created or added by specifying FOR SBCS or FOR MIXED in either the CREATE TABLE statement or the ALTER TABLE statement. Along with specifying the subtype as either for single byte data or for mixed data, the us- er/application can further specify the codepage to be used for the column of the table in the database. Internally within the database manager of this inven- tion, the subtype is recorded in terms of the code page attributes of the character data type as stored in the database system catalogs. This encoding scheme provides an efficient method of determining whether a column is only for single byte character set data or mixed data, and at the same time knowing the correct codepage that is to be used for that column simply by querying the code page columns within the database system catalogs.
589435
Chang Philip Y.
Engles Robert W.
Obermann David F.
Trumble Mary K.
Chang Philip Y.
Engles Robert W.
International Business Machines Corporation
Kerr Alexander
Obermann David F.
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