mysql - Query 语句所取出的字段类型大小总和，这句话的含义？

Question

如果我的查询是这样的

select col_1 from table where col_2='value' order by col_3 desc

那么“Query 语句所取出的字段类型大小总和”包含col_1，col_2，col_3中的那些？

Answer 1

I really don’t understand what you want to express...