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Difference between EXISTS and IN in SQL?
...way to avoid counting:
--this statement needs to check the entire table
select count(*) from [table] where ...
--this statement is true as soon as one match is found
exists ( select * from [table] where ... )
This is most useful where you have if conditional statements, as exists can be a lot ...
Using union and order by clause in mysql
...criteria from a table based on distance for a search on my site.
The first select query returns data related to the exact place search .
The 2nd select query returns data related to distance within 5 kms from the place searched.
The 3rd select query returns data related to distance within 5-15 kms f...
INSERT INTO vs SELECT INTO
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They do different things. Use INSERT when the table exists. Use SELECT INTO when it does not.
Yes. INSERT with no table hints is normally logged. SELECT INTO is minimally logged assuming proper trace flags are set.
In my experience SELECT INTO is most commonly used with intermediate d...
Vim: faster way to select blocks of text in visual mode
I have been using vim for quite some time and am aware that selecting blocks of text in visual mode is as simple as SHIFT + V and moving the arrow key up or down line-by-line until I reach the end of the block of text that I want selected.
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In Bash, how do I add a string after each line in a file?
... @shuhalo According to gnu sed documentation $ also acts as a special character only at the end of the regular expression. So $ regexp grabs the end of each line and s/$/appendix/ substitues the end of a line with a given string. This is my understanding.
– Azatik1000
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How to keep the spaces at the end and/or at the beginning of a String?
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@androiddeveloper, \u indicates a unicode character as an escape sequence (not a unicode char directly in the file). &#nnn; indicates an html entity, which means that you're relying on your xml string being html parsed (it is by default when used in text views)....
Should commit messages be written in present or past tense? [closed]
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"Fix bug X" is 2 characters shorter than "Fixed bug X".
And 3 shorter than "Fixing bug X".
From the point of view of writing-short-commit-messages, the present tense sometimes / usually saves a few characters?
Which I actually think matters ...
Automatically remove Subversion unversioned files
...X, my alternative is as follows, which translates the linebreaks into null chars and uses the -0 option on xargs to handle spaces in filenames: svn status | grep ^\? | cut -c9- | tr '\n' '\0' | xargs -0 rm
– Brian Webster
Apr 15 '11 at 22:19
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jQuery Validate Required Select
I am trying to validate html select element using jQuery Validate plugin. I set "required" rule to true but it always passes validation because zero index is chosed by default. Is there any way to define empty value that is used by required rule?
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Getting command-line password input in Python
...s function requires a proper terminal, so it can turn off echoing of typed characters – see “GetPassWarning: Can not control echo on the terminal” when running from IDLE for further details.
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