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What is the difference, if any, between these methods of indexing into a php array:
$array[$index]
$array["$index"]
$array["{$index}"]
Thanks!
Started by svec on
, 10 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
If $index is a number, for example 10, the first line will evaluate to $array[10 that $array["$....
If $index is a string there is no difference because $index, "$index", and "{$index}" all evaluate to the same string.
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** Dup: http://stackoverflow.com/questions/226002/whats-the-difference-between-x-x-vs-x **
So, even though I know you would never actually do this in code, I'm still curious:
public static void main(String[] args) { int index = 0; System.out.println(index...
Started by SCdF on
, 9 posts
by 9 people.
Answer Snippets (Read the full thread at stackoverflow):
Value++; is post and then its value is asigned....
Then the value (0) is assigned to index.
So index++ has a value of 0, although as a side effect index is incremented.
The assignment occurs after the expression has been evaluated.
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Can someone tell me what is the difference between these two:
ALTER TABLE x1 ADD INDEX(a); ALTER TABLE x1 ADD INDEX(b);
AND
ALTER TABLE x1 ADD INDEX(a,b);
I know this goes down to the very basics but sometimes I find the former seems to be a little faster...
Started by Legend on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Source....
It is possible or greater indexed column.
With your second option, the following query will not use the index:
SELECT * FROM x1 WHERE b = 'something';
The order in which columns are listed in the index definition is important.
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Ask your Facebook Friends
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Hi,
what are the main differences between a clustered index and an index seek?
Started by bigint on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
A clustered index is a kind of index where each leaf node of the index is the row in the corresponding....
A non-clustered index is a kind of index where each leaf node of the index points to a row in the corresponding table.
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Say, I have a table TABLE(col1,col2,col3)
and, I want create a index INDEX(col1=table.col1+table.col2)
Started by lovespring on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Documentation is here:
http://dev.mysql.com.
;== define index here ) engine=innodb;
or something like that.
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Can anyone tell me when an index is a bad index?
Started by Anoop on
, 9 posts
by 9 people.
Answer Snippets (Read the full thread at stackoverflow):
If the index....
The index is to help us to search the rows faster.
In contrary you might suffer performance hit.
If the field is never used, it is a bad index (if you feel unecessary things are bad of performance that indeces are for.
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Say I have a controller with an Index Method and a Update Method. After the Update is done I want to redirect to Index(). Should I use return RedirectToAction("Index") or can I just call return Index()? Is there a difference?
public ActionResult Index...
Started by TT on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Other things to consider:
Redirect action after.
Of the URL that corresponds to the Index action.
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Echo '<option value='+$index+'>'+$county[$index];
It is PHP code. It doesn't output what I want. Any idea?
Started by Steven on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
$index....
And the .= operators if you want: String Operators
Try this:
echo '<option value=' .
Operator not the +
echo '<option value='.$index.'>'.$county[$index];
You can read more about the .
To concatenate text in PHP use the.
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In the SSW rules to better SQL Server Database there is an example of a full database maintenance plan: SSW . In the example they run both a Reorganize Index and then a Rebuild Index and then Update Statistics. Is there any point to this? I thought Reorganize...
Started by beta tester ben on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
It means that you will get a completely new index, but with reorganize you can....
However if the pages are not in a contiguous it drops the index and rebuilds it from scratch.
The existing index(es) and defragments the existing pages.
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In a SQL Server Execution plan plans what is the difference between an Index Scan and an Index Seek
I'm on sql server 2005
Started by cindi on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
With an Index....
This can be efficient for small tables.
A good explanation can be found here
With an Index Scan, all rows in the index are being scanned to find a matching row.
As they are more efficient in the way it looks data up .
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