SQL编程学习的相关内容

文章 2023-01-14 来自：开发者社区

spark2 sql读取数据源编程学习样例2：函数实现详解

这里接着上篇，继续阅读代码，下面我们看看runBasicParquetExample函数的功能实现runBasicParquetExample函数private def runBasicParquetExample(spark: SparkSession): Unit = { // $example on:basic_parquet_example$ // Encoders for ...

文章 2023-01-14 来自：开发者社区

spark2 sql读取数据源编程学习样例1

作为一个开发人员，我们学习spark sql，最终的目标通过spark sql完成我们想做的事情，那么我们该如何实现。这里根据官网，给出代码样例，并且对代码做一些诠释和说明。/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See...

文章 2017-11-08 来自：开发者社区

PL/SQL编程的简单学习

PL/SQL简单学习 1.PL/SQL块的组成部分： ① 声明部分：该部分包含了变量和常量的定义，以及变量和常量的初始值定义，这部分由关键字declare开始，如果PL/SQL块中不需要声明变量或常量，该部分可以省略。 ② 执行部分：执行部分是PL/SQL的执行指定部分，由关键字begin开始，关键字end结尾。所有可执行的SQL都放在这一部分，该部分不能省略，end关键字后面使用...

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更新时间 2023-04-11 15:43:48

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