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When to use “ON UPDATE CASCADE”
...keys is a good & clean alternative to enums in my opinion (at least in MySQL DB flavors). For example, consider a table colors with rows blue, purple, yellow, and a table products with a product_color column, being FK'ed to the colors table. That restricts the choices like an enum, but unlike an...
What is the best way to get all the divisors of a number?
... Shimi has said, you should only be running your loop from 1 to the square root of n. Then to find the pair, do n / i, and this will cover the whole problem space.
As was also noted, this is a NP, or 'difficult' problem. Exhaustive search, the way you are doing it, is about as good as it gets for g...
SQL Query Where Field DOES NOT Contain $x
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Extract hostname name from string
I would like to match just the root of a URL and not the whole URL from a text string. Given:
27 Answers
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Load view from an external xib file in storyboard
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Yeah I had set the class of the root view instead of the file owner and it was causing an infinite loop.
– devios1
Feb 24 '17 at 0:31
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Generate Java classes from .XSD files…?
....annotation.* package. See code listing 1 for Item.java
From the code
@XmlRootElement(name="Item") indicates that I want to be the root element.
@XmlType(propOrder = {"name", "price"}) indicates the order that I want the element to be arranged in XML output.
@XmlAttribute(name="id", ...) indicates...
SQL join: selecting the last records in a one-to-many relationship
... features of your RDBMS to analyze the optimization plan. E.g. EXPLAIN on MySQL.
Some people use subqueries instead of the solution I show above, but I find my solution makes it easier to resolve ties.
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Git resolve conflict using --ours/--theirs for all files
...checkout --[ours/theirs] . will do what you want, as long as you're at the root of all conflicts. ours/theirs only affects unmerged files so you shouldn't have to grep/find/etc conflicts specifically.
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Dynamically change color to lighter or darker by percentage CSS (Javascript)
...format, then use calc() to manipulate them.
Here's a basic example:
:root {
--link-color-h: 211;
--link-color-s: 100%;
--link-color-l: 50%;
--link-color-hsl: var(--link-color-h), var(--link-color-s), var(--link-color-l);
--link-color: hsl(var(--link-color-hsl));
--link-colo...
Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.5 or one of
...at the last minute I tried 'mvn install'. This worked, which suggests the root cause is a problem with the servers for the default repository.
– Donal Lafferty
Jul 31 '13 at 12:35
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