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Boolean.hashCode()
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Suppose for a second that we picked composite numbers (non-primes), say 1000 and 2000. When inserting booleans into a hash table, true and false would go into bucket 1000 % N resp 2000 % N (where N is the number of buckets).
Now notice that
1000 % 8 same bucket as 2000 % 8
1000 % 10 same buck...
Postgres: How to do Composite keys?
... NULL,
tag_id SERIAL NOT NULL,
tag1 VARCHAR(20),
tag2 VARCHAR(20),
tag3 VARCHAR(20),
PRIMARY KEY(question_id, tag_id)
);
NOTICE: CREATE TABLE will create implicit sequence "tags_tag_id_seq" for serial column "tags.tag...
How to create a new file together with missing parent directories?
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answered Jun 22 '10 at 6:32
Jon SkeetJon Skeet
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Remove an Existing File from a Git Repo
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edited Nov 9 '10 at 17:50
answered Nov 8 '10 at 16:44
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How does one output bold text in Bash?
...ght sequences to send to the terminal:
bold=$(tput bold)
normal=$(tput sgr0)
then you can use the variables $bold and $normal to format things:
echo "this is ${bold}bold${normal} but this isn't"
gives
this is bold but this isn't
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Android layout replacing a view with another view on run time
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+50
You could replace any view at any time.
int optionId = someExpression ? R.layout.option1 : R.layout.option2;
View C = findViewById(R...
e.printStackTrace equivalent in python
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10
If you're working inside some kind of container such as Jython and therefore cannot just print the trace, you can format_exc instead to get ...
How to find a table having a specific column in postgresql
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edited Aug 29 '13 at 10:46
answered Aug 29 '13 at 10:39
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Eclipse: Can you format code on save?
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205
Under Preferences, choose Java --> Editor --> Save Actions. Check the Perform the select...
How to check if an array field contains a unique value or another array in MongoDB?
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220
Try this out:
db.blogpost.find({ 'tags' : 'tag1'}); //1
db.blogpost.find({ 'tags' : { $all : [ ...