Abstract. Query optimizers in object-relational database management systems require users to provide the execution cost models of user-defined functions(UDFs). Despite this need, however, there has been little work done to provide such a model. Furt
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UDF的开发和测试：teradata数据库UDF开发PDF资料，不错的工具书 SQL provides a set of useful functions, but they might not satisfy all of the particular requirements you have to process your data. User-defined functions (UDFs) allow you to extend SQL by writing your own fun
