How to select a row with MAX (column value) and DISTINCT through another column in SQL?

My desk is: id home datetime player resource ---|-----|------------|--------|--------- 1 | 10 | 04/03/2009 | john | 399 2 | 11 | 04/03/2009 | juliet | 244 5 | 12 | 04/03/2009 | borat | 555 3 | 10 | 03/03/2009 | john | 300 4 | 11 | 03/03/2009 | juliet | 200 6 | 12 | 03/03/2009 | borat | 500 7 | 13 | 24/12/2008 | b ...

Posted by elflacodepr on Sun, 22 Dec 2019 00:55:52 -0800

Precise code formatting, fast style switching?All you need is SQL Prompt!

SQL Prompt not only formats the code exactly as you want, but also helps you quickly switch to other styles or apply exceptions to parts of SQL scripts that don't require specific styles. SQL Prompt automatically retrieves object names, syntax, and code snippets from the database to provide users with appropriate code choices.Automatic script ...

Posted by Confessions on Sat, 21 Dec 2019 11:17:52 -0800

Configuring transparent gateway to access MS SQL SERVER Under Oracle

Configuration setting The server operating system IP address SQL SERVER Windows 2003 10.9.5.47 Oracle DB Linux 5.8 10.9.5.90 Oracle Gateways 1. Install transparent gateway After Oracle 11G, Gateways under linux ...

Posted by xnowandtheworldx on Sat, 21 Dec 2019 10:42:10 -0800

Light ORM sqlrepoex (6) JOIN

The example uses the latest SqlRepoEx 2.0.2 Available at: https://github.com/AzThinker/SqlRepoEx2.0Demo Or: https://gitee.com/azthinker/SqlRepoEx2.0Demo Demo module: GettingStartedNorthwind   1. Create a new console program; 2. Download SqlRepoEx.MsSql.Static through Nuget package management 3. According to the Orders, Customers and Employees t ...

Posted by Misery_Kitty on Fri, 20 Dec 2019 09:49:10 -0800

Python 3 operates MySQL database

Operating MySQL database in Python 3 To use mysql database in Python 3, you need to install the mysql Library pip install pymysql Operating MySQL Guide bag import pymysql Step 1: open the database connection db = pymysql.connect(host="Database address", user="user name", password="Password", ...

Posted by kks_krishna on Fri, 20 Dec 2019 06:16:01 -0800

Oracle learn Lesson 6

Pseudocolumn rowid: the physical location of the current data in the database Features: no table, can be found --View employee's job number, name, salary, and physical location id select employee_id,first_name,salary,rowid from employees;   rownum: number the query results that meet the query criteria (starting from 1) ...

Posted by shadysaiyan on Thu, 19 Dec 2019 12:48:20 -0800

Partitioning tables with online redefinition -- Based on rowid

RDBMS 11.2.0.4  Before, the table was redefined online. The primary key mode is mainly used. This time, because there is no primary key on the table, it is done through rowid. The following is a simple example, which does not involve indexes, etc. (in fact, the index is also very simple, just set it to the tmp table and take i ...

Posted by dubt2nv on Thu, 19 Dec 2019 11:58:13 -0800

Uploading and downloading pictures of wechat applet

As we all know, small programs have a large number of APIs, file (picture) upload is one of them Let me share my personal usage. What I have done is to publish and mix images and text like space log First is the selection of pictures. Using wx.chooseImage, the selected pictures are stored in an array for easy upload chooseImage: ...

Posted by udendra on Thu, 19 Dec 2019 11:03:21 -0800

[android learning notes] fuzzy search for ORM Lite learning like

[Objective] to achieve fuzzy search of multiple fields in the table. [method] ORM Lite like Method: like(columnName,pattern) uses the% wildcard to match, specifies the row data, and returns the matching result Usage demonstration: mDao.queryBuilder().where().like("LastName", "A%").query(); match the LastN ...

Posted by sungpeng on Thu, 19 Dec 2019 08:58:38 -0800

apache dbutils calls stored procedures based on oracle Database

Preface Apache Commons dbutils version 1.7 shows the calls that support stored procedures. Please pay attention to the version issue when using this code. 1.7 version update method int execute(String sql, Object… params) executes SQL statements, including stored procedure calls, which do not return any result sets. ...

Posted by xux on Thu, 19 Dec 2019 07:33:59 -0800