大约有 19,000 项符合查询结果（耗时：0.0380秒） [XML]
SQL: How to properly check if a record exists
...he Exists operator itself tries to retrieve just the absolute minimum of information, so the addition of TOP 1 does nothing except add 5 characters to the query size. - sqlservercentral.com/blogs/sqlinthewild/2011/04/05/…
– AquaAlex
Jul 20 '16 at 12:16
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Why does typeof array with objects return “object” and not “array”? [duplicate]
... treatment to a certain class of property names. A property name P (in the form of a String value) is an array index if and only if ToString(ToUint32(P)) is equal to P and ToUint32(P) is not equal to 2^32-1. A property whose property name is an array index is also called an element. Every Array obje...
Make browser window blink in task Bar
...ill blink on and off until they move the mouse. This should work cross platform, and even if they just have it in a different tab.
newExcitingAlerts = (function () {
var oldTitle = document.title;
var msg = "New!";
var timeoutId;
var blink = function() { document.title = document.ti...
Nullable type as a generic parameter possible?
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Personal preference, but you can use the short form T? instead of Nullable<T>
– Dunc
Sep 9 '10 at 15:04
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How do I send a POST request as a JSON?
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If you don't specify the header, it will be the default application/x-www-form-urlencoded type.
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MySQL - UPDATE query based on SELECT Query
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The first form (update with join) is going to be a lot more efficient than the second. The first would do a single join, whereas the second would execute the select query for every row of tableA.
– ColinM
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What is the use of ByteBuffer in Java? [closed]
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The ByteBuffer class is important because it forms a basis for the use of channels in Java. ByteBuffer class defines six categories of operations upon byte buffers, as stated in the Java 7 documentation:
Absolute and relative get and put methods that read and wri...
How to replace a set of tokens in a Java String?
... templating engine or anything like that for this. You can use the String.format method, like so:
String template = "Hello %s Please find attached %s which is due on %s";
String message = String.format(template, name, invoiceNumber, dueDate);
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What does the ^ operator do in Java?
... multiply your result so far by 10 before adding the next digit.
In table form:
step result digit result*10+digit
1 init=0 8 8
2 8 6 86
3 86 7 867
4 867 5 8675
5 8675 3 ...
How to loop over directories in Linux?
...rnal tools in your case:
for dir in /tmp/*/ # list directories in the form "/tmp/dirname/"
do
dir=${dir%*/} # remove the trailing "/"
echo ${dir##*/} # print everything after the final "/"
done
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