oracle sql没有，pl/sql 有
BOOLEAN
You use the BOOLEAN datatype to store the logical values TRUE, FALSE, and NULL
(which stands for a missing, unknown, or inapplicable value). Only logic operations
are allowed on BOOLEAN variables.The BOOLEAN datatype takes no parameters. Only the values TRUE, FALSE, and
NULL can be assigned to a BOOLEAN variable. You cannot insert the values TRUE
and FALSE into a database column. Also, you cannot select or fetch column values
into a BOOLEAN variable.取自<<PL/SQL USER GUIDE AND REFERENCE>>
BOOLEAN
You use the BOOLEAN datatype to store the logical values TRUE, FALSE, and NULL
(which stands for a missing, unknown, or inapplicable value). Only logic operations
are allowed on BOOLEAN variables.The BOOLEAN datatype takes no parameters. Only the values TRUE, FALSE, and
NULL can be assigned to a BOOLEAN variable. You cannot insert the values TRUE
and FALSE into a database column. Also, you cannot select or fetch column values
into a BOOLEAN variable.取自<<PL/SQL USER GUIDE AND REFERENCE>>
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