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Tue Jun 05 10:22:22 HKT 2018

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Mon Feb 19 22:28:20 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:28:16 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:28:14 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:28:10 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:28:07 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:28:03 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:27:59 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:27:58 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:27:56 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:27:54 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:27:51 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:27:50 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:27:47 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:27:46 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:27:41 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Mon Feb 19 22:27:39 HKT 2018 From /gallery/Day+Trip/%E9%BE%8D%E9%96%80%E9%83%8A%E9%81%8A%E5%BE%91


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Sat Feb 17 23:44:47 HKT 2018 From /weblog/learning

Learn fast

#1 – Pegging (or How Mental Magicians can Perfectly Recall Hundreds of Numbers)
#2 – Metaphor (Juliet is the sun… or is she a chemical formula?)
#3 – Total Immersion (Or How a Guy Can Become Fluent in 8 Languages)
#4 – Visceralization (What does a derivative look like?)
#5 – Linking (Or How to Remember a Grocery List Without the Paper)
#6 – The 5-Year Old Method (Try explaining quantum physics to a first grader)
#7 – Ambiance Catalysts (Or How Drinking a Pint Can Improve Your Studying)
#8 – Diagrams (Who said doodling in class was wrong?)
#9 – Speed Reading (Or How to Read 70 Books in a Year)[..]ng-that-most-people-have-never-heard-of/

用 6 個步驟,熟悉一個產業 -[..]g-domain-expertise-in-a-complex-industry[..]-like-the-best-in-the-world-555fa4de5010[..].com/how-to-learn-anything-faster-2016-8

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Fri Feb 16 10:05:31 HKT 2018 From /weblog/learning


In other words, both groups were stressed, but one group channeled the stress as a performance challenge; the other group as a performance threat. It wasn't the stress of a difficult test that caused distress--everyone felt that. It was how subjects interpreted their stress. -[..]mbracing-stress-minimizing-distress.html

Calming when conflict -[..]ks-in-the-human-body-to-make-or-break-us

A Stanford psychologist has a simple mental exercise for tackling student stress -[..]l-exercise-for-tackling-student-anxiety/

The 40% rule is simple: When your mind is telling you that you’re done, that you’re exhausted, that you cannot possibly go any further, you’re only actually 40% done. ( umm... not sure if it really useful all the time ) -[..]the-40-rule-the-simple-secret-to-success

“The ideal situation for improving learning and memory would be to experience no stress and to exercise,” Edwards said. -

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Fri Feb 16 00:27:25 HKT 2018 From /weblog/learning


These 3 Hacks Will Make You Remember More -[..]will-make-you-remember-more-b30a3d9b3136

When trying to memorise new material, it’s easy to assume that the more work you put in, the better you will perform. Yet taking the occasional down time – to do literally nothing – may be exactly what you need. Just dim the lights, sit back, and enjoy 10-15 minutes of quiet contemplation, and you’ll find that your memory of the facts you have just learnt is far better than if you had attempted to use that moment more productively. -[..]effortless-way-to-strengthen-your-memory

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Sun Feb 11 23:34:31 HKT 2018 From /weblog/business


說一個好故事,讓 Pitch 更精彩 -

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Tue Feb 06 00:00:21 HKT 2018 From /weblog/database/performance

Note of SQL performance tuning

Note of this book -

1) Order of "and" and "or" is matter, if no cost-base optimizer

where column1 = 'a' and column2 = 'b' -> where column2 = 'b' and column1 = 'a' if column2 'b' is less likely

2) <> is more expensive than =

3) Can force to use index if SELECT * FROM table WHERE indexed_column > 0

4) UPPER(column) might lose information, use LOWER is better

5) WHERE column = 'WORD' or column = 'word' is always faster than WHERE LOWER(column) = 'word' , even faster version is test if database if case-insensitive: WHERE column = 'WORD' or ('WORD' <> 'word' AND column = 'word')

6) 32bit integer is the fastest datatype for 32bit OS

7) column in (?, ?) is faster than column =? or column = ? for some database, and don't slow in any database

8) For aggregate functions, prevent using having, try to use fewer columns in group by and use subquery if possible

9) In fact, count(1) is not faster than count(*)

10) CAST before aggregate function: SELECT CAST(SUM(column) AS INT) -> SELECT SUM(CAST(column as INT))

11) Use constant as much as possible, e.g.: select * from t1, t2 where t1.c1 = t2.c1 and t1.c1 = 1 -> select * from t1, t2 where t1.c1=1 andn t2.c1=1

12) Information of Join vs Subqueries

13) Information of optimum column type (VARCHAR, TIMESTAMP, WORD size INT and CHAR(1) usually better), shift effect for page

14) prevent NULL for porting issue

15) Low level table physical information

Some related links -[..]9/12/sql-optimization-tipsquestions.html

16) Prevent database level transaction, prevent joining, prevent locking ( like auto increment key ), pretty good suggestion -

17) Reduce dataset for aggregation -[..]-subqueries-to-count-distinct-50x-faster

Few good tips, like avoid cursors -[..]ent/21-rules-for-faster-sql-queries.html

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Mon Feb 05 18:14:08 HKT 2018 From /weblog/entertainment


Prince -[..]-the-artist-you-knew-as-prince/?view=all

elvis-presley -[..]ting-facts-about-elvis-presley/?view=all

george-michael -[..]-not-know-about-george-michael/?view=all

【傾聽音樂】中世紀音樂是宗教的奴僕,還是高貴的婢女 -[..]%98%E8%B2%B4%E7%9A%84%E5%A9%A2%E5%A5%B3/

不曾用西洋曲式寫流行曲的-創作歌手-朱頂鶴 -不曾用西洋曲式寫流行曲的-創作歌手-朱頂鶴/

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Fri Feb 02 10:19:00 HKT 2018 From /weblog/design/interview


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