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A beginner's guide to SQL database design [closed]
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Experience counts for a lot, but in terms of table design you can learn a lot from how ORMs like Hibernate and Grails operate to see why they do things. In addition:
Keep different types of data separate - don't store addresses in your order table, link to an address ...
MySQL - How to select data by string length
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select * from table order by length(column);
Documentation on the length() function, as well as all the other string functions, is available here.
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Pandas count(distinct) equivalent
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I believe this is what you want:
table.groupby('YEARMONTH').CLIENTCODE.nunique()
Example:
In [2]: table
Out[2]:
CLIENTCODE YEARMONTH
0 1 201301
1 1 201301
2 2 201301
3 1 201302
4 2 ...
jQuery document.createElement equivalent?
...is.$OuterDiv = $('<div></div>')
.hide()
.append($('<table></table>')
.attr({ cellSpacing : 0 })
.addClass("text")
)
;
Update: I thought I'd update this post since it still gets quite a bit of traffic. In the comments below there's some discussi...
SQLite - replace part of a string
Is it possible using SQL in an SQLite table to replace part of a string?
3 Answers
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What's the best manner of implementing a social activity stream? [closed]
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I have created such system and I took this approach:
Database table with the following columns: id, userId, type, data, time.
userId is the user who generated the activity
type is the type of the activity (i.e. Wrote blog post, added photo, commented on user's photo)
data is a seriali...
Debugging sqlite database on the device
... debuggable, you can use the shell run-as command to run a command or executable as a specific user/application or just switch to the UID of your application so you can access its data directory.
So if you wish to pull your application database from the device you should run the debug build of the...
SQL Case Sensitive String Compare
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Select * from a_table where attribute = 'k' COLLATE Latin1_General_CS_AS
Did the trick.
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Remove menu and status bars in TinyMCE 4
...ne strikethrough superscript subscript | formats | removeformat'},
table: {title: 'Table', items: 'inserttable tableprops deletetable | cell row column'},
tools: {title: 'Tools', items: 'spellchecker code'}
}
});
see TinyMCE for more help.
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ASP.NET Identity's default Password Hasher - How does it work and is it secure?
...s secure
Random salts means that an attacker can’t use a pre-generated table
of hashs to try and break passwords. They would need to generate a
hash table for every salt. (Assuming here that the hacker has also compromised your salt)
If 2 passwords are identical they will
have different hashes. ...