标签: mongodb nosql
可能重复: Update MongoDB field using value of another field
对于数据库迁移,我总是发现在SQL中发布类似的东西很有帮助:
UPDATE users SET full_name = users.first_name || " " || users.last_name(PL / SQL) 要么 UPDATE users SET full_name = CONCAT( users.first_name, users.last_name )(MySQL)
UPDATE users SET full_name = users.first_name || " " || users.last_name
UPDATE users SET full_name = CONCAT( users.first_name, users.last_name )
如何在不首先获取所有文档并通过迭代更新它们的情况下在MongoDB中执行此操作?