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自定義字段toubi是什么格式的字段？

求和運算最好改成int數字類型字段

$builder->selectSum()

Writes a “SELECT SUM(field)” portion for your query. As with selectMax(), You can optionally include a second parameter to rename the resulting field.

$builder->selectSum('age');$query = $builder->get(); // Produces: SELECT SUM(age) as age FROM mytable

手冊語法：https://codeigniter4.github.io/userguide/database/query_builder.html?highlight=