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Using column alias in WHERE clause of MySQL query produces an error
...t has always worked for me though, I think the order of evaluation of the different parts of a statement had to be fixed (first WHERE, then SELECT, then GROUP BY,...) but I don't have a reference for that
– Joni
Nov 21 '14 at 6:44
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Create PostgreSQL ROLE (user) if it doesn't exist
...QL script to create a ROLE in PostgreSQL 9.1, but without raising an error if it already exists?
10 Answers
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Java Can't connect to X11 window server using 'localhost:10.0' as the value of the DISPLAY variable
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You need to specify the -Djava.awt.headless=true parameter at startup time.
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MongoDb query condition on comparing 2 fields
...o execute Javascript code on every record) so combine with indexed queries if you can.
db.T.find( { $where: function() { return this.Grade1 > this.Grade2 } } );
or more compact:
db.T.find( { $where : "this.Grade1 > this.Grade2" } );
UPD for mongodb v.3.6+
you can use $expr as described in re...
Facebook share link without JavaScript
...gs e)
{
var referer = Request.UrlReferrer.ToString();
if(string.IsNullOrEmpty(referer))
{
// some error logic
return;
}
Response.Clear();
Response.Redirect("https://www.facebook.com/sharer/sharer.php?u=" + HttpUtility.UrlE...
嵌套块验证失败：未知的代码块类型: procedures_ifreturn，已拒绝添加 - AI...
...视图
✗ 嵌套块验证失败：未知的代码块类型: procedures_ifreturn，已拒绝添加
✓ 代码块已整理
[
{
"action": "SWITCH_TO_BLOCKS"
},
{
"action": "ADD_BLOCK",
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What are the key differences between Scala and Groovy? [closed]
... closures and interoperate with Java. Other than that, they're extremely different.
Groovy is a "dynamic" language in not only the sense that it is dynamically typed but that it supports dynamic meta-programming.
Scala is a "static" language in that it is statically typed and has virtually no dyn...
How to count objects in PowerShell?
...k with the result as with object:
$m = get-alias | measure
$m.Count
And if you would like to have aliases in some variable also, you can use Tee-Object:
$m = get-alias | tee -Variable aliases | measure
$m.Count
$aliases
Some more info on Measure-Object cmdlet is on Technet.
Do not confuse it...
Draw text in OpenGL ES
...ently developing a small OpenGL game for the Android platform and I wonder if there's an easy way to render text on top of the rendered frame (like a HUD with the player´s score etc). The text would need to use a custom font also.
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XSLT equivalent for JSON [closed]
..., grep and friends let you play with text.
There are install packages for different OS.
3. jj
JJ is a command line utility that provides a fast and simple way to retrieve or update values from JSON documents. It's powered by GJSON and SJSON under the hood.
4. fx
Command-line JSON processing tool...