Why use user-defined functions (UDFs)? Modular programming. You can create the function once, store it in the database, and call it any number of times in your program. User-defined functions can be modified in
How to: Use Scalar-Valued User-Defined Functions Describes how to implement a function that returns scalar values. How to: Use Table-Valued User-Defined Functions Describes how to implement a function that returns table values. How to: Call User-Defined Functions Inline Describes how to make inl...
You can create user-defined functions (UDFs) and libraries of UDFs for use with HDInsight queries and transformations. Typically, the UDFs are written in Java and they can be referenced and used in a Hive or Pig script, or (less common) in custom map/reduce code. You can write UDFs in...
publicclassMyFunctions{publicstaticintvalThreshold(intid){switch(id) {case1:return15;case2:return11;case3:return18;default:return0; } } } A user-defined project function can be used like any other expression in a projection, as shown in the following example. ...
DLI supports the following three types of user-defined functions (UDFs):Regular UDF: takes in one or more input parameters and returns a single result.User-defined table-
1. 用户自定义函数 SQL Server 2000 编程员指南(一) ... FROM 表名 4用户自定义函数User-Defined Functions7 索引化视图 Indexed Views ... news.51kaoshi.cn|基于115个网页 2. 使用者定义的函式 gawk 手册 ... ... 第八章 内建函式( Built-in Functions) 第九章使用者定义的函式(User-defined Func...
1.Hive之UDFs(User-Defined Functions ) 1.1 Hive UDFs (User Defined Functions) 可以在SQL处理比较繁琐或者无法胜任时,解决比较复杂数据处理手段。 1.2 Hive的功能函数有哪些? 内置操作(UDO) 内置功能(UDF) 内置聚合功能(UDAF) 内置的表-生成功能(UDTF) ...
User-defined functions can take any number of parameters, and optional parameters are supported. Optional parameters are specified using theoptionaltag in the IDL file. Overloading functions based on type or return value is not allowed. When resolving function names, the OLE DB for OLAP provider...
User-defined functions can't return multiple result sets. Use a stored procedure if you need to return multiple result sets. Error handling is restricted in a user-defined function. A UDF doesn't supportTRY...CATCH,@ERRORorRAISERROR.
User-defined functions written in either Transact-SQL or .NET Framework can return both scalar and table values. Properties of Functions There are several properties of user-defined functions that determine the ability of the SQL Server Database Engine to index the results of the function, either...