CREATE TEMPORARY? TABLE _table ( (_column _type column_constraint), (_column _type column_constraint)* table_constraint?)
table_constraint: PRIMARY KEY
                      # Example：CONSTRAINT pk_example PRIMARY KEY (column1, column2)
                  | UNIQUE
                      # Example：CONSTRAINT uk_example UNIQUE (column1)
                  | FOREIGN KEY
                      # Example：CONSTRAINT fk_example FOREIGN KEY (column1) REFERENCES other_table(column2)
                  | CHECK
                      # Example：CONSTRAINT chk_example CHECK (column1 > 0)
column_constraint: NOT NULL
                      # Example：column_name VARCHAR2(50) NOT NULL
                   | PRIMARY KEY
                      # Example：column_name NUMBER(10) PRIMARY KEY
                   | UNIQUE
                      # Example：column_name VARCHAR2(50) UNIQUE
                   | CHECK
                      # Example：column_name NUMBER CHECK (column_name > 0)
                   | FOREIGN KEY
                      # Example：column_name NUMBER(10) REFERENCES other_table(other_column)
                   | DEFAULT
                      # Example：column_name VARCHAR2(50) DEFAULT 'default_value'