alter table iot_product_version add cloumn CHANNEL_MODEL_VERSION varchar16 DEFAULT NULL COMMENT 通道版本 预发对吗这个sql语句

No, there is a spelling mistake in the query. "cloumn" should be "column". The correct query is:

ALTER TABLE iot_product_version ADD COLUMN CHANNEL_MODEL_VERSION varchar(16) DEFAULT NULL COMMENT '通道版本';

This query adds a new column named "CHANNEL_MODEL_VERSION" to the "iot_product_version" table with a data type of varchar(16) and a default value of NULL. It also adds a comment to describe the column's purpose.