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“Diff” an image using ImageMagick
...th layers, 3) remove alpha channels from both layers in the Layers tab, 4) select the G + B channels on one layer, select all and clear the channels with black color, the same with the R + B channels on the second layer, 4) set Screen mode for the upper layer in the Layers tab.
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Android - Launcher Icon Size
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@android developer, you can select "Legacy only" as the icon type if you want to generate icons without specifying the background layer. If you choose "Adaptive and Legacy", the legacy icons will be generated by merging the foreground and background lay...
Can you use hash navigation without affecting history?
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Unless you use :target selectors ... then history functions are useless, as that part of the spec (css interaction with history ops) seems to be not defined currently, and style does not get recomputed on history replace by most/all browsers.
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ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
...al code
mask = ((r["dt"] >= startdate) & (r["dt"] <= enddate))
selected = r[mask]
looks correct. However, if you do want and, then instead of a and b use (a-b).any() or (a-b).all().
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How do I flush the PRINT buffer in TSQL?
...y the following;
-- Replace PRINT function
DECLARE @strMsg NVARCHAR(100)
SELECT @strMsg = 'Here''s your message...'
RAISERROR (@strMsg, 0, 1) WITH NOWAIT
OR
RAISERROR (n'Here''s your message...', 0, 1) WITH NOWAIT
sha...
What are .NET Assemblies?
...Visual Web Developer, you can add a reference to an assembly explicitly by selecting the menu option Website, Add Reference, and selecting the name of the assembly that you need to reference. For example, adding a reference to the System.Messaging.dll assembly results in the web configuration file i...
How to get a subset of a javascript object's properties
... Is there any function to exclude only certain fields instead of selecting? so I have about 50 fields in my json and want everything except just 2 fields.
– Shrikant Prabhu
Jul 3 '18 at 1:01
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Generate table relationship diagram from existing schema (SQL Server) [closed]
...nstalled ) . Just right Click on Database Diagrams and create new diagram. Select the exisiting tables and if you have specified the references in your tables properly. You will be able to see the complete diagram of selected tables.
For further reference see Getting started with SQL Server databas...
Favorite (Clever) Defensive Programming Best Practices [closed]
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SQL
When I have to delete data, I write
select *
--delete
From mytable
Where ...
When I run it, I will know if I forgot or botched the where clause. I have a safety. If everything is fine, I highlight everything after the '--' comment tokens, and run...
Best way to store time (hh:mm) in a database
...t a glance and performing calculations on them are straightforward.
E.g.
SELECT DATEDIFF(MINUTE, event_start, event_end)
ISO8601 date standard
If using SQLite then you don't have this, so instead use a Text field and store it in ISO8601 format eg.
"2013-01-27T12:30:00+0000"
Notes:
This use...