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select * vs select column
If I just need 2/3 columns and I query SELECT * instead of providing those columns in select query, is there any performance degradation regarding more/less I/O or memory?
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jQuery get value of select onChange
I was under the impression that I could get the value of a select input by doing this $(this).val(); and applying the onchange parameter to the select field.
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'too many values to unpack', iterating over a dict. key=>string, value=>list
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Can't be iterating directly in dictionary. So you can through converting into tuple.
first_names = ['foo', 'bar']
last_names = ['gravy', 'snowman']
fields = {
'first_names': first_names,
'last_name': last_names,
}
tup_field=tuple(fields.items())
for names in fields.i...
Prevent text selection after double click
...lick event on a span in my web app. A side-effect is that the double click selects text on the page. How can I prevent this selection from happening?
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jQuery to retrieve and set selected option value of html select element
I am attempting to retrieve and set the selected value of a select element (drop down list) with jQuery.
9 Answers
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How to find third or nth maximum salary from salary table?
...you want a single) or DENSE_RANK(for all related rows):
WITH CTE AS
(
SELECT EmpID, EmpName, EmpSalary,
RN = ROW_NUMBER() OVER (ORDER BY EmpSalary DESC)
FROM dbo.Salary
)
SELECT EmpID, EmpName, EmpSalary
FROM CTE
WHERE RN = @NthRow
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jquery input select all on focus
I'm using this code to try and select all of the text in the field when a user focuses on the field. What happens is, it selects all for a second, then its unselected and the typing cursor is left where I clicked...
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jQuery If DIV Doesn't Have Class “x”
...y I need to do an if statement to see if $this doesn't contain the class '.selected'.
7 Answers
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sql query to return differences between two tables
...colum C, here are the records, which are present in table A but not in B:
SELECT A.*
FROM A
LEFT JOIN B ON (A.C = B.C)
WHERE B.C IS NULL
To get all the differences with a single query, a full join must be used, like this:
SELECT A.*, B.*
FROM A
FULL JOIN B ON (A.C = B.C)
WHERE A.C IS NUL...
How to add a custom right-click menu to a webpage?
.... It's very useful and the same jQuery used in this answer could easily be converted to standard JavaScript commands. It may not be 100% inline with the request in the original question, but it's definitely 95% inline with it.
– The Duke Of Marshall שלום
Ap...