更新现有记录而不删除 mysql 中的字段

代码如下

  app.put("/update/:id", (req, res) => {
    const userID = req.params.id;
    const sql = "UPDATE quotes SET `first_name` = ?, `last_name` = ?, `company` = ?, `email` = ?, `phone` = ? WHERE id = ?"
    const values = [my values]
    db.query(sql, [...values, userID], (err, data) => {
        if (err) return res.send(err)
        return res.json(data)
    })
})

这是收到的错误

  {
    "code": "ER_BAD_NULL_ERROR",
    "errno": 1048,
    "sqlState": "23000",
    "sqlMessage": "Column 'first_name' cannot be null",
    "sql": "UPDATE quotes SET `first_name` = NULL, `last_name` = NULL, `company` = NULL, `email` = NULL, `phone` = NULL WHERE id = '2'"
}

希望每当更新时，例如，它不会影响其他字段并保持其记录原样first_name