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Null-safe Comparison in SQL. Even though I know the concept of 3-valued logic in SQL, I trip over it from time to time. For example, say, we have some. Table in MySQL might look like the following. CREATE TABLE tags ( id BIGINT NOT NULL AUTO INCREMENT, name VARCHAR(20), tag group id BIGINT, PRIMARY KEY (id) );. Imagine we have the following rows in the table. INSERT INTO tags (name, tag group id) VALUES ('mysql', 1), ('psql', 1), ('sqlite', 1), ('android', 2), ('ios', 2), ('emacs', NULL);. Finally, I hav...

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Null-safe Comparison in SQL. Even though I know the concept of 3-valued logic in SQL, I trip over it from time to time. For example, say, we have some. Table in MySQL might look like the following. CREATE TABLE tags ( id BIGINT NOT NULL AUTO INCREMENT, name VARCHAR(20), tag group id BIGINT, PRIMARY KEY (id) );. Imagine we have the following rows in the table. INSERT INTO tags (name, tag group id) VALUES ('mysql', 1), ('psql', 1), ('sqlite', 1), ('android', 2), ('ios', 2), ('emacs', NULL);. Finally, I hav...
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Null-safe Comparison in SQL. Even though I know the concept of 3-valued logic in SQL, I trip over it from time to time. For example, say, we have some. Table in MySQL might look like the following. CREATE TABLE tags ( id BIGINT NOT NULL AUTO INCREMENT, name VARCHAR(20), tag group id BIGINT, PRIMARY KEY (id) );. Imagine we have the following rows in the table. INSERT INTO tags (name, tag group id) VALUES ('mysql', 1), ('psql', 1), ('sqlite', 1), ('android', 2), ('ios', 2), ('emacs', NULL);. Finally, I hav...

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Domon » Private Class Methods in Ruby

http://domon.cc/2013/12/25/private-class-methods-in-ruby

Private Class Methods in Ruby. To make a class method private, we just have to place a. Keyword before it, like this:. Class Foo private def self.bar "bar" end end. Negative, it is still public:. Pry(main) Foo.bar = "bar". To make it private, we have to call. Class Foo def self.bar "bar" end private class method :bar end. Pry(main) Foo.bar NoMethodError: private method `bar' called for Foo:Class. Before I try to explain it, I’d like to introduce another way to create a private class method:.

2

Domon » Shame Driven Development

http://domon.cc/2012/12/12/shame-driven-development

Several days ago, I saw a code challenge. It challenges users to write a ruby program that mimics the basic functionalities of the UNIX. Command. Users are encouraged to not rely on. Or other libraries. Expected time of writing this program is 15 minutes. Cal 12 2012 December 2012 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31. That should be an easy exercise. Almost, if not every, programmer has written a. Now, say, in 15 minutes? Cal 9 1752 Sept...

3

Domon » About

http://domon.cc/about

Hi, I'm Domon. My name is Chun-wei Kuo. But friends usually call me "Domon". I am a software engineer currrently living in Taiwan. I have some years of experience in web development using Ruby on Rails. For more information about my background, please check my profile on LinkedIn. You can also find some of my code at Github. Follow me on Twitter. If you feel inclined. :).

4

Domon » Equality of Active Record Objects

http://domon.cc/2012/05/25/equality-of-active-record-objects

Equality of Active Record Objects. There was once a caching problem in a project I am working on. Of some posts is used as cache keys. According to the document. Will return different numbers if any attribute changes. But the cache just won’t refresh. To figure out that problem, let’s start with two posts (in rails console):. They are the same post:. 3] pry(main) p1 = p2 = true. If we change an attribute of. 4] pry(main) p1.title = "hi" = "hi". 5] pry(main) p1 = p2 = true. They also have the same hash:.

5

Domon » When Your Ctrl-C Gets Trapped

http://domon.cc/2013/07/14/when-your-ctrl-c-gets-trapped

When Your Ctrl-C Gets Trapped. Have you ever met a program that no matter how hard you hit. It just wouldn’t stop? I was a little annoyed by such behavior of the bc. Basic calculator) program on Mac (or FreeBSD):. Bc -q (interrupt) use quit to exit. In fact, when hitting. We are just sending a. To the program. The program may trap. The signal and probably ignore it. To achieve that in Ruby is simple:. Some processes even wouldn’t stop when we try to kill. In such cases, the. Kill -s KILL pid.

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Domon » Home

Null-safe Comparison in SQL. Even though I know the concept of 3-valued logic in SQL, I trip over it from time to time. For example, say, we have some. Table in MySQL might look like the following. CREATE TABLE tags ( id BIGINT NOT NULL AUTO INCREMENT, name VARCHAR(20), tag group id BIGINT, PRIMARY KEY (id) );. Imagine we have the following rows in the table. INSERT INTO tags (name, tag group id) VALUES ('mysql', 1), ('psql', 1), ('sqlite', 1), ('android', 2), ('ios', 2), ('emacs', NULL);. Finally, I hav...

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