Tags » Primary Key

Week 8 - Muddiest Point

Vector space model is something that I have heard of before, but it was just in brief passing. We never spent a large amount of time on it. 82 more words

Muddiest Point

Week 3 - Muddiest Point

So I have used a content management system to develop and maintain the website for the office I used to work at. I understand the basic concept that the CMS is used to organize and disseminate information amongst its various other features. 122 more words

Muddiest Point

實習 -day 18

2017/8/8 (二)

絕對不是因為我偷懶所以好幾天沒寫實習日記,而是那幾天都沒有做什麼所以看Python、R當做功課。

因為李總好像以為我們要幫Vincent做很多事(Eric是幫Vincent做滿多事的啦),而且他原本想要我們做的事情我們都沒有做過,雖然我真的沒有做過很多事但我覺得如果李總派下來我們還是會想辦法完成,畢竟每個工作如果都有做過那就不用來學了啊。結果李總就說我們還是研究車辨軟體就好了,讀參數設定的文件,看要怎麼設定才能辨到最多車牌。 131 more words

實習

Normalization in Data Modelling

Functional Dependency

Functional dependency (FD) is a set of constraints between two attributes in a relation. Functional dependency says that if two tuples have same values for attributes A1, A2,…, An, then those two tuples must have to have same values for attributes B1, B2, …, Bn. 1,188 more words

Cassandra node vs partition: A simple explanation

As explained in How does Cassandra store data? – A simple explanation Cassandra uses partitioning key (the first part of primary key) to store a record into a partition on a node. 141 more words

Cassandra

Migrating SQL applications to Cassandra – Pattern #4

Pattern #4: Get rid of all OR operators from sql where clauses. For example, consider an SQL requirement to authenticate user by comparing the string entered by the user with either username… 76 more words

Cassandra

Cassandra Primary Key = ((Partitioning Key), Clustering Key): A simple explanation

Cassandra primary key (a unique identifier for a row) is made up of two parts – 1) one or more partitioning columns and 2) zero or more clustering columns. 526 more words

Cassandra