大约有 40,000 项符合查询结果（耗时：0.0636秒） [XML]
mysql update column with value from another table
...for example:
UPDATE tableB
INNER JOIN tableA ON tableB.name = tableA.name
SET tableB.value = IF(tableA.value > 0, tableA.value, tableB.value)
WHERE tableA.name = 'Joe'
share
|
improve this answ...
How do I navigate in the results of Diff
... etc.
On new (linux) systems the default $PAGER used (even when it is not set) is less (it used to be the less capable more).
In both less and more the ? key gives you a command shortcut list.
share
|
...
Advantages of Binary Search Trees over Hash Tables
...p to 5000 exists.
(what about the keys between 0 and 5000 are an infinite set? for example keys can be decimals)
share
|
improve this answer
|
follow
|
...
How do I match any character across multiple lines in a regular expression?
...pt = ::boost::regbase::normal = 0 which defaults to Perl. Programmers will set a base flag definition #define MOD regex_constants::perl | boost::regex::no_mod_s | boost::regex::no_mod_m for thier regex flags to reflect that. And the arbitor is always the inline modifiers. Where (?-sm)(?s).* resets.
...
Preserve line endings
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
...
Securely storing environment variables in GAE with app.yaml
...e datastore using this class:
from google.appengine.ext import ndb
class Settings(ndb.Model):
name = ndb.StringProperty()
value = ndb.StringProperty()
@staticmethod
def get(name):
NOT_SET_VALUE = "NOT SET"
retval = Settings.query(Settings.name == name).get()
if not retval:
...
Elasticsearch query to return all records
...tems. (where BIGNUMBER equals a number you believe is bigger than your dataset)
BUT, elasticsearch documentation suggests for large result sets, using the scan search type.
EG:
curl -XGET 'localhost:9200/foo/_search?search_type=scan&scroll=10m&size=50' -d '
{
"query" : {
"matc...
The best way to remove duplicate values from NSMutableArray in Objective-C?
...
Your NSSet approach is the best if you're not worried about the order of the objects, but then again, if you're not worried about the order, then why aren't you storing them in an NSSet to begin with?
I wrote the answer below in 20...
How can I get LINQ to return the object which has the max value for a given property? [duplicate]
...e.ReadKey();
}
}
public class Item
{
public int ClientID { get; set; }
public int ID { get; set; }
}
Rearrange the list and get the same result
share
|
improve this answer
...
how to use sed, awk, or gawk to print only what is matched?
...p on the line read, and if it matches prints out the contents of the first set of bracks ($1).
You can do this will multiple file names on the end also. e.g.
perl -ne 'print $1 if /.*abc([0-9]+)xyz.*/' example1.txt example2.txt
...