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How to select the last record of a table in SQL?
...he best we can do is something like
Sql Server
SELECT TOP 1 * FROM Table ORDER BY ID DESC
MySql
SELECT * FROM Table ORDER BY ID DESC LIMIT 1
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Evaluate expression given as a string
... capture output and all warnings, errors and other messages along with the raw results:
> pander::evals("5+5")
[[1]]
$src
[1] "5 + 5"
$result
[1] 10
$output
[1] "[1] 10"
$type
[1] "numeric"
$msg
$msg$messages
NULL
$msg$warnings
NULL
$msg$errors
NULL
$stdout
NULL
attr(,"class")
[1] "eval...
Is there a way to access the “previous row” value in a SELECT statement?
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SQL has no built in notion of order, so you need to order by some column for this to be meaningful. Something like this:
select t1.value - t2.value from table t1, table t2
where t1.primaryKey = t2.primaryKey - 1
If you know how to order things but not...
Convert a Unicode string to a string in Python (containing extra symbols)
...\x9c10'
>>> s.encode('utf16')
'\xff\xfe\x9c\x001\x000\x00'
This raw string of bytes can be written to a file. However, note that when reading it back, you must know what encoding it is in and decode it using that same encoding.
When writing to files, you can get rid of this manual encode...
Difference between one-to-many and many-to-one relationship
... I am afraid that doesn't make scenes! (NOT SURE BUT) i think the order represents dependency! Doesn't it?? E.G, A User to Role may be 1 to many but not many to one because one cannot get references of the user that use the role! Does that make sense?
– Amanuel Nega
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jQuery: more than one handler for same event
...dler does not override an older handler.
The handlers will execute in the order in which they were bound.
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SQL Server indexes - ascending or descending, what difference does it make?
...'t a lookup be just as fast either way? What difference does it make which order I choose?
3 Answers
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Optimistic vs. Pessimistic locking
I understand the differences between optimistic and pessimistic locking. Now could someone explain to me when I would use either one in general?
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What is the difference between indexOf() and search()?
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