The fetch action definition UI is shown in Figure 4.

获取操作定义 UI 如图 4 所示。

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If a DELETE rule is not explicitly defined, the on DELETE no ACTION definition is used by default.

如果没有明确定义DELETE规则，将默认使用ON DELETE NO ACTION定义。

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Figure 5 shows an example where the ON DELETE NO ACTION definition will allow a delete operation to be performed that the ON DELETE RESTRICT definition would prevent.

图 5 显示了一个示例，其中 ON DELETE NO ACTION 定义允许执行 ON DELETE RESTRICT 定义可能阻止的一个删除操作。

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