为了避免太多的复杂性，DB 2强加了一条简单的规则：除非嵌入在相关的函数里面，否则UPDATE、DELETE或INSERT(数据更改操作)不应该出现在连接中。

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.

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