PostgreSQL, HTAP, OLTP, OLAP, Scenario and Performance Testing
PostgreSQL is a database with a long history, which can be traced back to 1973. It was first awarded by the 2014 Computer Turing Prize winner and the originator of relational database. Michael_Stonebraker PostgreSQL has similar functions, performance, architectur ...
Posted on Tue, 18 Dec 2018 04:39:04 -0800 by webrajesh
mysql-8.0.12-winx64.zip version of MySQL Installation-Free Configuration Tutorial under windows
Step 1: Download this version of mysql file from the mysql official website
Step 2: Unzip the file
The third step is to analyze the file structure
Step 4: Configuration
Create a new data folder in the mysql root directory
Posted on Mon, 17 Dec 2018 04:57:04 -0800 by FireDrake
I. Built-in Function Supplement
1. isinstance(obj,cls) checks whether obj is a cls-like object?
obj = Foo()
print(isinstance(obj, Foo)) #The result is True
2. issubclass(sub, super) checks whether the subclass is a derived class of the super class.
class Ba ...
Posted on Mon, 17 Dec 2018 02:12:04 -0800 by Gorf
0x01 Running Environment
dapper version 1.50.2
.net framework 4.5
0x02 Problem Description
The entity object contains attributes such as DateTime?, DateTime, int, int?. When using the dapper method IDbConnect. Query <>() method, it prompts the System.InvalidOperationException exception, which is confirmed as the exception caused by D ...
Posted on Mon, 17 Dec 2018 02:00:04 -0800 by agent47
2018-03-01 Data Structure and Algorithms (4)
1.16 Filter Sequence Elements
The simplest way to filter sequence elements is to use list inference. For example:
>>> mylist = [1, 4, -5, 10, -7, 2, 3, -1]
>>> [n for n in mylist if n > 0]
[1, 4, 10, 2, 3]
>>> [n for n in mylist if n < 0]
[-5, -7, -1]
Posted on Mon, 17 Dec 2018 00:21:04 -0800 by Peredy
Add Golang Learning QQ Group to Learn Progress, Start a Family and Start a Business Job ^-^ Group Number: 96933959
go get github.com/garyburd/redigo/redis
Redis comp ...
Posted on Sun, 16 Dec 2018 19:15:04 -0800 by jgmiddel
1. Auto-encapsulation of 32-bit uuid for insertion data by annotations
2. Automatically encapsulating insertion date by annotation
3. Annotation realizes automatic update date of update data
4. Paging query auto-encapsulation returns the total number of qualified queries
5. Encapsulating data validation for arbitrary requests
6. Encapsulating ...
Posted on Sun, 16 Dec 2018 06:12:04 -0800 by smiley_kool
1.rownum and rowid are pseudo columns, but they are fundamentally different. rownum assigns one to each row based on the results of sql queries
Logical number, different sql will lead to different rownum, but rowid is physical structure, when every record Insert to the database,
There will be a unique physical record. rowid can be said to ex ...
Posted on Sat, 15 Dec 2018 22:33:04 -0800 by cap2cap10
Original text: When will my rebalance complete Author: Bane Radulovic Translator: Wei Xinghua is a senior technical expert of Waterloo Science and Technology. He mainly participates in the R&D and design of the company's integrated machine products, monitoring products, disaster tolerance products and DBaaS platform. He has worked for E ...
Posted on Sat, 15 Dec 2018 01:15:04 -0800 by UnsuitableBadger
Analysis of lock tables and unlock tables in MySQL The grammar functions of lock tables and unlock tables are provided in MySQL, which are not available in ORACLE and SQL Server databases. Believe that people who have just come into contact with MySQL want to have a detailed and in-depth understanding of this function. Next, try to fully anal ...
Posted on Fri, 14 Dec 2018 22:39:05 -0800 by mistcat