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Favourite performance tuning tricks [closed]
...arting the query
Check that all processes are accessing tables in the same order
Are indices being used appropriately?
Joins will only use index if both expressions are exactly the same data type
Index will only be used if the first field(s) on the index are matched in the query
Are clustered i...
Java Regex Capturing Groups
...d since it's any character, it'll match as many characters as there are in order to fulfill the condition for the next groups).
In short, your 1st group .* matches anything as long as the next group \\d+ can match something (in this case, the last digit).
As per the 3rd group, it will match anyt...
LINQPad [extension] methods [closed]
... where d.Contains(".exe") || d.Contains(".dll")
orderby d
select d;
q.Dump();
This will dump all files with file extensions ".exe" or ".dll" contained in C:\windows\system32. The /s switch is used to recurse all subdirectories and /b is used for bare output format. N...
How to see query history in SQL Server Management Studio
...ovic commented, it might be helpful to join on sys.dm_exec_query_stats and order by last_execution_time:
SELECT t.[text], s.last_execution_time
FROM sys.dm_exec_cached_plans AS p
INNER JOIN sys.dm_exec_query_stats AS s
ON p.plan_handle = s.plan_handle
CROSS APPLY sys.dm_exec_sql_text(p.plan_hand...
How can I reverse a NSArray in Objective-C?
...rray with the objects that have not yet been traversed with nextObject, in order:
This array contains all the remaining objects of the enumerator in enumerated order.
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Why use sprintf function in PHP?
...
You can also repeat and reorder the arguments to display. e.g. sprintf('%2$s %1$s, my name is also %1$s.', 'World', 'Hello'); resulting in Hello World, my name is also World.
– Will B.
May 17 '17 at 1:41
...
Get array of object's keys
...ys(foo);
console.log(keys) // ['alpha', 'beta']
// (or maybe some other order, keys are unordered).
This is an ES5 feature. This means it works in all modern browsers but will not work in legacy browsers.
The ES5-shim has a implementation of Object.keys you can steal
...
How can I prevent SQL injection in PHP?
...dcoded in your script and chosen from that set.
For example, to do dynamic ordering:
$orders = array("name", "price", "qty"); // Field names
$key = array_search($_GET['sort'], $orders)); // if we have such a name
$orderby = $orders[$key]; // If not, first one will be set automatically.
$query = "S...
How to get index using LINQ? [duplicate]
...
An IEnumerable is not an ordered set.
Although most IEnumerables are ordered, some (such as Dictionary or HashSet) are not.
Therefore, LINQ does not have an IndexOf method.
However, you can write one yourself:
///<summary>Finds the index of ...
Case insensitive searching in Oracle
...) or lower(column_1), as appropriate, this may force a full table scan. In order to avoid this you can create a function-based index.
create index my_index on my_table ( lower(column_1) );
If you're using LIKE then you have to concatenate a % around the string you're searching for.
select * from...