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How to request a random row in SQL?
...andom row from a database table. It goes through methods for doing this in MySQL, PostgreSQL, Microsoft SQL Server, IBM DB2 and Oracle (the following is copied from that link):
Select a random row with MySQL:
SELECT column FROM table
ORDER BY RAND()
LIMIT 1
Select a random row with PostgreSQL:
...
What's the best way to store co-ordinates (longitude/latitude, from Google Maps) in SQL Server?
...
I don't know the answer for SQL Server but...
In MySQL save it as FLOAT( 10, 6 )
This is the official recommendation from the Google developer documentation.
CREATE TABLE `coords` (
`lat` FLOAT( 10, 6 ) NOT NULL ,
`lng` FLOAT( 10, 6 ) NOT NULL ,
) ENGINE = MYISAM ;
...
ab load testing
...how everything performs together: including complex PHP code, and multiple MySQL queries...
For example here is the results of testing a fresh install of Wordpress on the same system and WAMP environment (I'm using WampDeveloper, but there are also Xampp, WampServer, and others)...
Requests per se...
pip broke. how to fix DistributionNotFound error?
...
The root of the problem are often outdated scripts in the bin (Linux) or Scripts (Windows) subdirectory. I'll explain this using problem I encountered myself as an example.
I had virtualenv version 1.10 installed in my user site...
How to get process ID of background process?
...done
Then just run it as: ./bgkill.sh with proper permissions of course
root@umsstd22 [P]:~# ./bgkill.sh
PID=23757
dPidLst= 23758 23759
UNO
DOS
UID PID PPID C STIME TTY TIME CMD
root 3937 3935 0 11:07 pts/5 00:00:00 -bash
root 23757 3937 0 11:55 pts/5 00:00:00...
Map enum in JPA with fixed values?
...nverter.
Create an enumerated class like so:
public enum NodeType {
ROOT("root-node"),
BRANCH("branch-node"),
LEAF("leaf-node");
private final String code;
private NodeType(String code) {
this.code = code;
}
public String getCode() {
return code;
...
Can I try/catch a warning?
...t a lot of time debugging a problem in a system where someone had written @mysql_query( '...' ) and the problem was that mysql support was not loaded into PHP and it threw a silent fatal error. It will be safe for those things that are part of the PHP core but please use it with care.
bob@mypc:~$ p...
How can I get the current user's username in Bash?
...ernative to whoami is id -u -n.
id -u will return the user id (e.g. 0 for root).
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Git Push Error: insufficient permission for adding an object to repository database
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I must had issued git push using root account in my working directory. I found the owner of some git repository files is root (-r--r--r--. 1 root root 6380 5月 25 12:39 9b44bd22f81b9a8d0a244fd16f7787a1b1d424) according this answer.
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Error - trustAnchors parameter must be non-empty
... by itself can be used as a workaround, as well.
# 0. First make yourself root with 'sudo bash'.
# 1. Save an empty JKS file with the default 'changeit' password for Java cacerts.
# Use 'printf' instead of 'echo' for Dockerfile RUN compatibility.
/usr/bin/printf '\xfe\xed\xfe\xed\x00\x00\x00\x0...