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What is the difference between partitioning and bucketing a table in Hive ?
...ten used for distributing load horizontally, this has performance benefit, and helps in organizing data in a logical fashion. Example: if we are dealing with a large employee table and often run queries with WHERE clauses that restrict the results to a particular country or department . For a faster...
How to properly create composite primary keys - MYSQL
... gross oversimplification of an intense setup I am working with. table_1 and table_2 both have auto-increment surrogate primary keys as the ID. info is a table that contains information about both table_1 and table_2 .
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Wildcards in jQuery selectors
... to use a wildcard to get the id of all the elements whose id begin with "jander". I tried $('#jander*') , $('#jander%') but it doesn't work..
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SQL JOIN and different types of JOINs
What is a SQL JOIN and what are different types?
6 Answers
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jQuery Determine if a matched class has a given id
...hat it won't apply to all #foo elements (though there should only be one), and it won't apply to all .bar elements (though there may be many). It will only reference elements that qualify on both attributes.
jQuery also has a great .is method that lets your determine whether an element has certain ...
Remove by _id in MongoDB console
...jectId.
Also, note that in some drivers/tools, remove() is now deprecated and deleteOne or deleteMany should be used instead.
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Does the join order matter in SQL?
Disregarding performance, will I get the same result from query A and B below? How about C and D?
4 Answers
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How can I change CSS display none or block property using jQuery?
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The correct way to do this is to use show and hide:
$('#id').hide();
$('#id').show();
An alternate way is to use the jQuery css method:
$("#id").css("display", "none");
$("#id").css("display", "block");
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Overriding id on create in ActiveRecord
...me belongs_to semantics in ActiveRecord, but instead of having a migration and creating a table, and incurring the overhead of the database on every call, you just store your data in yml files. The foreign keys in the database reference the in-memory ids in the yml.
ActiveHash is great for picklis...
Query EC2 tags from within instance
... use a combination of the AWS metadata tool (to retrieve your instance ID) and the new Tag API to retrieve the tags for the current instance.
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