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Properly escape a double quote in CSV
... \n".
You can use below online tool to escape "" and , operators.
https://www.freeformatter.com/csv-escape.html#ad-output
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How do I rename a column in a SQLite database table?
...N fails with an error and no changes are applied.
Image source: https://www.sqlite.org/images/syntax/alter-table-stmt.gif
Example:
CREATE TABLE tab AS SELECT 1 AS c;
SELECT * FROM tab;
ALTER TABLE tab RENAME COLUMN c to c_new;
SELECT * FROM tab;
db-fiddle.com demo
Android Support
As of...
git remote add with other SSH port
...
url = ssh://evanc@www.foo.com:11720/aaa/bbb/ccc ...
PostgreSQL: Difference between text and varchar (character varying)
...l varlena (variable length array).
Check this article from Depesz: http://www.depesz.com/index.php/2010/03/02/charx-vs-varcharx-vs-varchar-vs-text/
A couple of highlights:
To sum it all up:
char(n) – takes too much space when dealing with values shorter than n (pads them to n), and c...
Why unsigned integer is not available in PostgreSQL?
...d types. However I would suggest to use domains for unsigned types.
http://www.postgresql.org/docs/9.4/static/sql-createdomain.html
CREATE DOMAIN name [ AS ] data_type
[ COLLATE collation ]
[ DEFAULT expression ]
[ constraint [ ... ] ]
where constraint is:
[ CONSTRAINT constraint_name...
What is a dependency property?
...
The only explanation I found helpful and well written is this one: http://www.wpftutorial.net/dependencyproperties.html
Basically, DependencyProperties differ from regular properties in that they're not just setters / getters for fields in the class, but they retrieve their actual values dynamical...
Ajax using https on an http page
...Allow-Origin header from the server
Access-Control-Allow-Origin: https://www.mysite.com
http://en.wikipedia.org/wiki/Cross-Origin_Resource_Sharing
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Make WPF window draggable, no matter what element is clicked
... CodeProject demonstrates one possible solution to implement this:
http://www.codeproject.com/KB/cs/DraggableForm.aspx
Basically a descendant of the Form type is created in which the mouse down, up and move events are handled.
Mouse down: remember position
Mouse move: store new location
Mous...
Using multiple property files (via PropertyPlaceholderConfigurer) in multiple projects/modules
... to others in the context without
throwing an exception
source: http://www.baeldung.com/2012/02/06/properties-with-spring/
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How do I get SUM function in MySQL to return '0' if no values are found?
...table
WHERE ...
To see it in action, please see this sql fiddle: http://www.sqlfiddle.com/#!2/d1542/3/0
More Information:
Given three tables (one with all numbers, one with all nulls, and one with a mixture):
SQL Fiddle
MySQL 5.5.32 Schema Setup:
CREATE TABLE foo
(
id INT NOT NULL AUT...