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SQL - using alias in Group By
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SQL is implemented as if a query was executed in the following order:
FROM clause
WHERE clause
GROUP BY clause
HAVING clause
SELECT clause
ORDER BY clause
For most relational database systems, this order explains which names (columns or aliases) are valid because they must have been ...
How to generate a range of numbers between two numbers?
....n + 100*hundreds.n + 1000*thousands.n BETWEEN @userinput1 AND @userinput2
ORDER BY 1
Demo
A shorter alternative, that is not as easy to understand:
WITH x AS (SELECT n FROM (VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9)) v(n))
SELECT ones.n + 10*tens.n + 100*hundreds.n + 1000*thousands.n
FROM ...
How to sort a HashSet?
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A HashSet does not guarantee any order of its elements. If you need this guarantee, consider using a TreeSet to hold your elements.
However if you just need your elements sorted for this one occurrence, then just temporarily create a List and sort that:
Se...
Rename a dictionary key
... old name key; and without iterating through dict key/value?
In case of OrderedDict, do the same, while keeping that key's position.
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In Functional Programming, what is a functor?
...ule that provides:
The type of key to be used in the binary tree
A total-ordering function on keys
Once you've done this, you can use the same balanced binary tree implementation forever. (The type of value stored in the tree is usually left polymorphic—the tree doesn't need to look at values...
How do I see the last 10 commits in reverse-chronological order with SVN?
...t X number of commits along with commit messages, in reverse-chronological order (newest commit first)?
4 Answers
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Simple way to calculate median with MySQL
... @rownum:=0) r
WHERE d.val is NOT NULL
-- put some where clause here
ORDER BY d.val
) as dd
WHERE dd.row_number IN ( FLOOR((@total_rows+1)/2), FLOOR((@total_rows+2)/2) );
Steve Cohen points out, that after the first pass, @rownum will contain the total number of rows. This can be used to de...
How does tuple comparison work in Python?
...(1,2) is false because the type is not the same).
Collections that support order comparison are ordered the same as their first unequal elements (for example, [1,2,x] <= [1,2,y] has the same value as x <= y). If a corresponding element does not exist, the shorter collection is ordered first (f...
In Python, how can you load YAML mappings as OrderedDicts?
I'd like to get PyYAML 's loader to load mappings (and ordered mappings) into the Python 2.7+ OrderedDict type, instead of the vanilla dict and the list of pairs it currently uses.
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Convert from enum ordinal to enum type
...ng for me. It returns out the ordinal value is not guaranteed to match the order in which the enumerated types are added. I don't know that is what this answer is advocating, but I wanted to warn people nonetheless
– IcedDante
Jul 14 '15 at 0:06
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