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Framework vs. Toolkit vs. Library [duplicate]
...s relating to collections of related code, which have both historical (pre-1994/5 for the purposes of this answer) and current implications, and the reader should be aware of both, particularly when reading classic texts on computing/programming from the historic era.
Library
Both historically, an...
Export specific rows from a PostgreSQL table as INSERT SQL script
...the same to another table of the same structure anywhere with:
COPY other_tbl FROM '/path/to/file.csv';
COPY writes and read files local to the server, unlike client programs like pg_dump or psql which read and write files local to the client. If both run on the same machine, it doesn't matter mu...
Correct way to delete cookies server-side
...d link above, we find this given as an example of the format:
Sun, 06 Nov 1994 08:49:37 GMT
and find that the syntax definition...
requires that dates be written in day month year format, not month day year format as used by the question asker.
Specifically, it defines rfc1123-date as follows:...
Accessing outside variable using anonymous function as params
...hat function is executing.
Code:
$result = '';
fetch("SELECT title FROM tbl", function($r) use (&$result) {
$result .= $r['title'];
});
But beware (taken from one of comments in previous link):
use() parameters are early binding - they use the variable's value at
the point where t...
How to sum a variable by group
...
library(plyr)
ddply(tbl, .(Category), summarise, sum = sum(Frequency))
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How can I return pivot table output in MySQL?
...OUNT(action = 'PRINT' AND pagecount = 3 OR NULL) AS "Print 3 pages"
FROM tbl
GROUP BY company_name;
SQL Fiddle.
How?
TRUE OR NULL yields TRUE.
FALSE OR NULL yields NULL.
NULL OR NULL yields NULL.
And COUNT only counts non-null values. Voilá.
...
PostgreSQL function for last inserted ID
...
SELECT CURRVAL(pg_get_serial_sequence('my_tbl_name','id_col_name'))
You need to supply the table name and column name of course.
This will be for the current session / connection
http://www.postgresql.org/docs/8.3/static/functions-sequence.html
...
Relational table naming convention [closed]
... it is a column. The same goes for tables. Don't name tables EMPLOYEE_T or TBL_EMPLOYEES because the second it is replaced with a view, things get really confusing.
Don't embed type information in names, such as "vc_firstname" for varchar, or "flavour_enum". Also don't embed constraints in column n...
How do you set a default value for a MySQL Datetime column?
...I am using version 5.6.22, but still I got error as follows : CREATE TABLE tbl ( InsertDate DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP, UpdateDate TIMESTAMP NULL ON UPDATE CURRENT_TIMESTAMP(6) ); Error Code: 1294. Invalid ON UPDATE clause for 'UpdateDate' column
– Manish S...
What is the difference between a port and a socket?
...eferences
TCP-IP Illustrated Volume 1 The Protocols, W. Richard Stevens, 1994 Addison Wesley
RFC793, Information Sciences Institute, University of Southern California for DARPA
RFC147, The Definition of a Socket, Joel M. Winett, Lincoln Laboratory
...