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What does @: (at symbol colon) mean in a Makefile?
...his always happens
this always happens
Now, the action part of a rule can be any shell command, including :. Bash help explains this as well as anywhere:
$ help :
:: :
Null command.
No effect; the command does nothing.
Exit Status:
Always succeeds.
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How can I see the specific value of the sql_mode?
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It's only blank for you because you have not set the sql_mode. If you set it, then that query will show you the details:
mysql> SELECT @@sql_mode;
+------------+
| @@sql_mode |
+------------+
| |
+------------+
1 row in set (0.00 sec)
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arrow operator (->) in function heading
I came across the following code:
2 Answers
2
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Undoing a commit in TortoiseSVN
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Don't forget to commit afterwards, because it just merges locally.
– pihentagy
Apr 26 '11 at 10:38
5
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How can I break an outer loop with PHP?
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In the case of 2 nested loops:
break 2;
http://php.net/manual/en/control-structures.break.php
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Index on multiple columns in Ruby on Rails
...arting at the beginning. i.e. if you index on [:user_id, :article_id], you can perform a fast query on user_id or user_id AND article_id, but NOT on article_id.
Your migration add_index line should look something like this:
add_index :user_views, [:user_id, :article_id]
Question regarding 'u...
When editing Microsoft Office VBA, how can I disable the popup “Compile error” messages?
...you want to paste into that line. But, if that partial line isn't syntactically valid, the VBA editor interrupts your work by popping up a "Compile error" message that has to be dismissed.
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MySQL join with where clause
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You need to put it in the join clause, not the where:
SELECT *
FROM categories
LEFT JOIN user_category_subscriptions ON
user_category_subscriptions.category_id = categories.category_id
and user_category_subscriptions.user_id =1
See, with an inner join, putting a clause in the join ...
looping through an NSMutableDictionary
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you can use
[myDict enumerateKeysAndObjectsUsingBlock: ^(id key, id obj, BOOL *stop) {
// do something with key and obj
}];
if your target OS supports blocks.
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HTML/CSS: Make a div “invisible” to clicks?
...ransparent <div> over some text. However, this means that the text can't be clicked (eg, to click links or select it). Would it be possible to simply make this div "invisible" to clicks and other mouse events?
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