Liang Tan
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A pin a day is a groat a year
LeetCode daily Challenge LeetCode daily Challenge
2020- 11 - 02: 349. Intersection of Two ArraysProblem link. Method 1: HashTableUsing two HashSet. put one array numbers
2020-11-01 algorithm
Java Python Data Structure Algorithm Design
Reservoir Sampling Reservoir Sampling
1.Introduction.Reservoir Sampling is an online algorithm designed for picking up small amount of sample with uniform pro
2020-05-14 Liang Tan
Python Big Data sampling algorithm
Nearest point search in PostGIS Nearest point search in PostGIS
A frequently retrieving task is to find the nearest candidate to the target candidate based on speific feature. 1. Naive
2020-05-14 Liang Tan
PostGIS PostgreSQL R-tree SQL Data Structure and algorithm
Create time-series spatial databases With TimeScaleDB and PostGIS Create time-series spatial databases With TimeScaleDB and PostGIS
1. Introduction:This post will go through some basic concepts and examples. All the experiments are running on the Ubant
2020-03-17 Liang Tan
SQL, PostgreSQL, Time-series Database, spatial databases, data storage
Learning SQL BY Task Series (1) Movie Rating Learning SQL BY Task Series (1) Movie Rating
1. Problem Description:You are given serveral tables as follows: Table: Movies +---------------+---------+ | Column N
2020-03-10 Liang Tan
SQL
Learning Netty from scratch - 1. Blocking, Non-Blocking &&　Synchronous, Asynchronous Learning Netty from scratch - 1. Blocking, Non-Blocking &&　Synchronous, Asynchronous
Let’s try to understand these 4 concept by an example. Suppose, You want to boil some water. Suppose you are Process A,
2019-08-10 Liang Tan
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