Shulou(Shulou.com)06/01 Report--

The view comes from the base table. If the view uses some functions, such as sum,avg,count, etc., combined data, data that does not exist in the base table, if you change the view, an error will occur.

The create view huthon_view as (select avg (shuxue) from xuesheng) that creates a view to average has already created a huthon_view. If you change the average shuxue, it will make a mistake that the article comes from www.dc3688.com.

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