Previously, you saw that the complexity of the generated job, and thus the number of stages composing the job, increases when you use columnar tests or functions with a rule.
从前,看到所生成任务的复杂性,组成任务的阶段数量,在使用具有柱状测试或者函数的规则时会增长。
2
To avoid too much complexity, DB2 imposes a simple rule: an UPDATE, DELETE or INSERT (data-change-operation) shall never happen in a join unless embedded in a correlated function.