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SQLite table constraint - unique on multiple columns
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edited May 18 at 7:31
Martin Tournoij
22.1k1717 gold badges8585 silver badges116116 bronze badges
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Rails auto-assigning id that already exists
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edited Jun 17 '12 at 5:07
answered Jun 17 '12 at 4:43
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Convert varchar to uniqueidentifier in SQL Server
...n defined as varchar(50) which stores uniqueidentifiers in the format 'a89b1acd95016ae6b9c8aabb07da2010' (no hyphens)
6 Ans...
Add hover text without javascript like we hover on a user's reputation
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edited Dec 12 '18 at 20:52
Shubham Chaudhary
32.4k88 gold badges6464 silver badges7676 bronze badges
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How to check if field is null or empty in MySQL?
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194
Either use
SELECT IF(field1 IS NULL or field1 = '', 'empty', field1) as field1
from tablenam...
Simple basic explanation of a Distributed Hash Table (DHT)
...hese problems is a logical ring of n nodes, each taking responsibility for 1/n of the keyspace. Once you add a node to the network, it finds a place on the ring to sit between two other nodes, and takes responsibility for some of the keys in its sibling nodes. The beauty of this approach is that non...
How to get an enum which is created in attrs.xml in code
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101
There does not seem to be an automated way to get a Java enum from an attribute enum - in Java...
image.onload event and browser cache
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As you're generating the image dynamically, set the onload property before the src.
var img =...
Read password from stdin
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281
>>> import getpass
>>> pw = getpass.getpass()
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Turning off some legends in a ggplot
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edited Dec 25 '15 at 20:47
answered Jan 30 '13 at 12:55
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