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Ruby Arrays: select(), collect(), and map()
...re, to check the :qty key, you'd do something like the following:
details.select{ |item| item[:qty] != "" }
That will give you all items where the :qty key isn't an empty string.
official select documentation
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Postgres DB Size Command
..."pg_datbase" system table. Just apply the function to the names, as below.
select t1.datname AS db_name,
pg_size_pretty(pg_database_size(t1.datname)) as db_size
from pg_database t1
order by pg_database_size(t1.datname) desc;
If you intend the output to be consumed by a machine instead of a...
Dump a mysql database to a plaintext (CSV) backup from the command line
... separated) files which can import into Excel, etc, quite easily:
% echo 'SELECT * FROM table' | mysql -B -uxxx -pyyy database
Alternatively, if you've got direct access to the server's file system, use SELECT INTO OUTFILE which can generate real CSV files:
SELECT * INTO OUTFILE 'table.csv'
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Finding # occurrences of a character in a string in Ruby
... Ruby method (1.9...) that can help me find the number of occurrences of a character in a string. I'm looking for all occurrences, not just the first one.
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Use JNI instead of JNA to call native code?
...g to the Java standard output:
native "C++" void printHello() {
const char* helloWorld = "Hello, World!";
`System.out.println(#$(helloWorld));`
}
JANET then translates the backtick-embedded Java into the appropriate JNI calls.
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Disable dragging an image from an HTML page
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But this lead to the weird selection effect in FF atleast. Better still return false;
– Bhumi Singhal
Feb 22 '13 at 10:24
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How do I select the “last child” with a specific class name in CSS? [duplicate]
How do I select the "last child" with the class name: list ?
6 Answers
6
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Is there a way to check if int is legal enum in C#?
...nt, absolutely nothing else
Enum names in C# must begin with an alphabetic character
No valid enum name can being with a minus sign: -
Calling ToString() on an enum returns either the int value if no enum (flag or not) is matched. If an allowed enum value is matched, it will print the name of the ...
Finding duplicate values in MySQL
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Do a SELECT with a GROUP BY clause. Let's say name is the column you want to find duplicates in:
SELECT name, COUNT(*) c FROM table GROUP BY name HAVING c > 1;
This will return a result with the name value in the first colum...
How to create a GUID/UUID in Python
...UUID with the dashes included, while uuid4().hex returns "The UUID as a 32-character hexadecimal string"
– stuartd
Jan 30 '18 at 10:08
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