技术SQL sql语句的相关内容

阿里云文档 2024-07-01

DAS中使用的SQL优化技术原理

SQL优化技术能够自动检测并分析数据库中的慢查询问题，识别出执行效率低下的SQL语句。通过深入分析这些SQL的执行计划，技术会提出改进建议或直接进行优化，比如重写SQL语句、调整索引使用等，以减少查询时间，降低资源消耗。

文章 2023-12-20 来自：开发者社区

【大数据技术Hadoop+Spark】Hive基础SQL语法DDL、DML、DQL讲解及演示（附SQL语句）

Hive基础SQL语法1：DDL操作DDL是数据定义语言，与关系数据库操作相似，创建数据库CREATE DATABASE|SCHEMA [IF NOT EXISTS] database_name显示数据库SHOW databases；查看数据库详情DESC DATABASE|SCHEMA database_name切换数据库USE database_name修改数据库ALTER (DATABAS....

文章 2019-06-01 来自：开发者社区

一起谈.NET技术，linq2sql：直接执行sql语句

　　1、ExecuteQuery方法　　看命名，我们很容易联想到ado.net里熟悉的Command的ExecuteNonQuery方法，但是VS的智能提示告诉我们这个方法返回的是一个泛型集合，应该“所思非所得”。下面通过一个简单方法，验证我们的猜想（数据库设计可以参考这一篇）： Code highlighting produced by Actipro CodeHighlighter ...

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更新时间 2024-04-23 09:26:31

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