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How to order by with union in SQL?
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Just write
Select id,name,age
From Student
Where age < 15
Union
Select id,name,age
From Student
Where Name like "%a%"
Order by name
the order by is applied to the complete resultset
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CROSS JOIN vs INNER JOIN in SQL
..., if you have 100 rows in each table with 1 to 1 match, you get 10.000 results, Innerjoin will only return 100 rows in the same situation.
These 2 examples will return the same result:
Cross join
select * from table1 cross join table2 where table1.id = table2.fk_id
Inner join
select * from tab...
Is there a generator version of `string.split()` in Python?
... comprehension, which would have generated extra memory). This did not result in a noticeable growth of memory (that is, if there was a growth in memory, it was far far less than the 1GB string).
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month name to month number and vice versa in python
...reason, >>> d = dict(v,k for k,v in calendar.month_abbr) File "<stdin>", line 1 SyntaxError: Generator expression must be parenthesized if not sole argument
– Mark_Masoul
Aug 5 '10 at 18:56
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Why is Git better than Subversion?
...tories in every single folder (Git only creates one .git directory). Every script you write, and every grep you do, will need to be written to ignore these .svn directories. You also need an entire command ("svn export") just to get a sane copy of your files.
In SVN, each file & folder can come ...
Character reading from file in Python
...sal newlines mode properly. Use io.open() instead on Python 2.7+ (it is builtin open() on Python 3).
– jfs
Jun 5 '15 at 20:25
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How to take a screenshot programmatically on iOS
...ering a check for retina display use the following code snippet:
#import <QuartzCore/QuartzCore.h>
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
UIGraphicsBeginImageContextWithOptions(self.window.bounds.size, NO, [UIScreen mainScreen].scale);
} else {
UIGraphics...
How to change letter spacing in a Textview?
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what is the default letterSpacing?
– Shivam
May 21 '19 at 14:07
4
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json_decode to array
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@jamesnotjim The default implementation that returns an object could beg the question that objects are better return values than arrays, could it not?
– David Mann
Nov 13 '13 at 2:43
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How to use sed to remove the last n lines of a file
... edited Feb 20 '14 at 11:50
laalto
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answered Nov 14 '12 at 14:26
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