Sometimes the LINQ, Query Expressions or Fetch just doesn't give you the ability to quickly query your data in the way you want to. A good example of this is the lack of left outer join support if you want a where clause to filter results based on th…

Raw SQL Queries Entity Framework allows you to query using LINQ with your entity classes. However, there may be times that you want to run queries using raw SQL directly against the database. This includes calling stored procedures, which can be help…

原文 Executing Raw SQL Queries using Entity Framework While working with Entity Framework developers mostly use LINQ to Entities to query database. However, at times you may need to execute raw queries against the database. A common scenario is when yo…

video from youtube: http://www.youtube.com/watch?v=79NWqv3aPRI one blog post: Monitor All SQL Queries in MySQL http://www.howtogeek.com/howto/database/monitor-all-sql-queries-in-mysql/ more: Using the New MySQL Query Profiler http://web.archive.org/w…

使用MySQL执行update的时候报错:   MySQL     在使用mysql执行update的时候,如果不是用主键当where语句,会报如下错误,使用主键用于where语句中正常. 异常内容:Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle t…

Entity Framework Core allows you to drop down to raw SQL queries when working with a relational database. This can be useful if the query you want to perform can't be expressed using LINQ, or if using a LINQ query is resulting in inefficient SQL bein…

Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Queries and reconnect. 这是因为MySql运行在safe-updates模式下,该模式会导致非主键条件下无法执行u…

https://www.codeproject.com/Articles/43305/Tracing-SQL-Queries-in-Real-Time-for-MySQL-Databas     Assembly and MySQL Introduction One of the more interesting things for any person is to see how the internal engines from the server software work. The…

In this Document   Abstract   History   Details   Previous Releases   Release 12   Multi-Org Session Context   Backwards Compatibility Applies to: Oracle Project Foundation - Version 12.0.0 to 12.1.3 [Release 12.0 to 12.1] Information in this documen…

In this Document   Abstract   History   Details   Previous Releases   Release 12   Multi-Org Session Context   Backwards Compatibility APPLIES TO: Oracle Project Foundation - Version 12.0.0 to 12.1.3 [Release 12.0 to 12.1] Information in this documen…

免费Sql Server 格式化插件 http://www.apexsql.com/sql_tools_refactor.aspx http://architectshack.com/PoorMansTSqlFormatter.ashx#Download_5   收费: http://www.red-gate.com/products/sql-development/sql-prompt/ http://www.ssmsboost.com/   整体感觉ApexSql还是不错的!…

Elasticsearchis a great search engine, flexible, fast and fun. So how can I get started with it? This post will go through how to get contents from a SQL database into Elasticsearch. Elasticsearch has a set of pluggable services called rivers. A rive…

引用自:http://rusanu.com/2013/08/01/understanding-how-sql-server-executes-a-query/ Understanding how SQL Server executes a query August 1st, 2013 If you are a developer writing applications that use SQL Server and you are wondering what exactly happens…

或者说,同事. 需要帮助她打印出来sql 调试输出到页面sql 在这里,我们使用插件或一个的方式来启动配置文件wordpress的debug 在插件文件夹 wordpress/wp-content/plugins/ 新建一个文件叫bt_debug_sql.php <?php /* Plugin Name:    Bt Debug Sql. Plugin URI:     http://www.btroot.com Description:    Show the sql at the front…

或者说,同事. 需要帮她打印出来sql 调试输出到页面sql 在这里,我们使用插件或一个的方式来启动配置文件wordpress的debug 在插件文件夹 wordpress/wp-content/plugins/ 新建一个文件叫bt_debug_sql.php <?php /* Plugin Name:    Bt Debug Sql. Plugin URI:     http://www.btroot.com Description:    Show the sql at the frontp…

转自:https://wso2.com/library/articles/2018/02/stream-processing-101-from-sql-to-streaming-sql-in-ten-minutes/ We have entered an era where competitive advantage comes from analyzing, understanding, and responding to an organization’s data. When doing…

有关关系型数据库跟Mongod的语法对比 In addition to the charts that follow, you might want to consider the Frequently Asked Questions section for a selection of common questions about MongoDB. Terminology and Concepts The following table presents the various SQL ter…

Appendices Published: April 27, 2005 On This Page Appendix A: SQL Server for Oracle Professionals Appendix B: Getting the Best Out of SQL Server 2000 and Windows Appendix C: Baselining Appendix D: Installing Common Drivers and Applications Installing…

https://www.codeproject.com/Articles/630346/Understanding-how-SQL-Server-executes-a-query https://www.codeproject.com/Articles/732812/How-to-analyse-SQL-Server-performance     This article will help you write better database code and will help you ge…

http://support.microsoft.com/kb/224453 Summary In this article, the term "connection" refers to a single logged-on session of the database. Each connection appears as a Session ID (SPID). Each of these SPIDs is often referred to as a process, al…

Spark SQL 之 DataFrame 转载请注明出处:http://www.cnblogs.com/BYRans/ 概述(Overview) Spark SQL是Spark的一个组件,用于结构化数据的计算.Spark SQL提供了一个称为DataFrames的编程抽象,DataFrames可以充当分布式SQL查询引擎. DataFrames DataFrame是一个分布式的数据集合,该数据集合以命名列的方式进行整合.DataFrame可以理解为关系数据库中的一张表,也可以理解为R/Pyth…

Spark版本:1.6.2 概览 Spark SQL用于处理结构化数据,与Spark RDD API不同,它提供更多关于数据结构信息和计算任务运行信息的接口,Spark SQL内部使用这些额外的信息完成特殊优化.可以通过SQL.DataFrames API.Datasets API与Spark SQL进行交互,无论使用何种方式,SparkSQL使用统一的执行引擎记性处理.用户可以根据自己喜好,在不同API中选择合适的进行处理.本章中所有用例均可以在spark-shell.pyspark shel…

在play中用函数式框架slick来操作数据库是一件很爽的事情.但有时因为某些特殊场景又不得不用原生的sql了. 还好slick支持这种写法,可以看看slick官方文档,Slick Plain SQL queries http://slick.lightbend.com/doc/3.1.1/sql-to-slick.html#slick-plain-sql-queries 下面说说我的场景,我的一个系统中有一个表格,由于用这个系统的也都是技术人员,为了方便就直接在表格上面开放了一个sql查询框,…

Spark SQL 官方文档-中文翻译 Spark版本:Spark 1.5.2 转载请注明出处:http://www.cnblogs.com/BYRans/ 1 概述(Overview) 2 DataFrames 2.1 入口:SQLContext(Starting Point: SQLContext) 2.2 创建DataFrames(Creating DataFrames) 2.3 DataFrame操作(DataFrame Operations) 2.4 运行SQL查询程序(Running…

一.错误 rror Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Queries and reconnect. 二.原因 处于安全考虑,防止因意外操作而删除大量的数据而做的设计. 例如: 需要将…

Where did we come from? With the 0.9.0-milestone1 release, Apache Flink added an API to process relational data with SQL-like expressions called the Table API. The central concept of this API is a Table, a structured data set or stream on which relat…

P6 Professional Installation and Configuration Guide (Microsoft SQL Server Database) 16 R1       May 2016 Contents About This Guide...................................................................................... 11 Shared Topics in This Guide .…

I tried to upgrade AX 2012 R3 Retail channel database from CU9 to CU11 for client. after generated new CreateDatabase.dll with upgraded Retail SDK, ran the Channel Configuration Utility, but got error. So I tried the sql queries from CreateDatabase p…

Find and exploit SQL Injections with free Netsparker SQL Injection Scanner SQL Injection Cheat Sheet, Document Version 1.4 About SQL Injection Cheat Sheet Currently only for MySQL and Microsoft SQL Server, some ORACLE and some PostgreSQL. Most of sam…

SQL injection is a code injection technique, used to attack data-driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker).[1] SQL injection must exploit…