sequelize etc

1) [DB].findOne({key:value})
디비에서 하나만 찾으세요.

const exUser = await db.User.findOne({
	where: {
    	userId: req.body.userId,
    },
});

2) [DB].create({key: value})
디비에 내용을 넣으세요.

const newUser = await db.User.create({
	nickname: req.body.nickname,
});