which data type i must choose for boolean type field?

I wanna create a Boolean field in my oracle table but I seen there is no boolean or byte data type so,which one of the oracle data type I must choose for a boolean value?

answer: I find how Oracle developer do this by wisard:

CREATE TABLE TABLE17
(
  COLUMN1 CHAR(1 BYTE) 开发者_运维问答NOT NULL,
  COLUMN2 VARCHAR2(4000)
)
;

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if you are looking for "y" or "n" you can use CHAR(1)

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You can use char(1) or number(1)

If you use number(1), set 0-False and 1-True as many programming languages 1 & 0 for Boolean