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Boolean is a PL/SQL data type used to declare variables that can take one of the following values: TRUE, FALSE or NULL.

[edit] Example

  v_bool BOOLEAN := FALSE;
  v_bool := TRUE;

Please note that "boolean" cannot be used as the datatype of a column (BOOLEAN is a PL/SQL-only type). Use something like this instead:

... col1 NUMBER(1,0) CHECK (col1 IN (1,0)),
... col2 VARCHAR2(1) CHECK (col2 IN ('T','F')),
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