大约有 48,000 项符合查询结果（耗时：0.0383秒） [XML]
Using varchar(MAX) vs TEXT on SQL Server
...es ('b')
insert into @table values ('c')
insert into @table values ('d')
select *
from @table
where a ='a'
This give an error:
The data types text and varchar are incompatible in the equal to operator.
Wheras this does not:
declare @table table (a varchar(max))
Interestingly, LIKE still wo...
How to flatten tree via LINQ?
...IEnumerable<MyNode> Flatten(IEnumerable<MyNode> e) =>
e.SelectMany(c => Flatten(c.Elements)).Concat(new[] { e });
You can then filter by group using Where(...).
To earn some "points for style", convert Flatten to an extension function in a static class.
public static IEnume...
WPF ToolBar: how to remove grip and overflow
...e for the ToolBarPanel, Menu, or ToolBar.
Right click on the ToolBar and select Edit Template
From Edit Template, select Edit a Copy
I recommend adding the copy to a Resource Dictionary
Click Ok
You'll now be editing the control template for the ToolBarPanel, and can set the visibility to Collap...
Why does SSL handshake give 'Could not generate DH keypair' exception?
...DHE_.... The later would happen if I added BouncyCastle. If TLS_ECDHE_ was selected, MOST OF the time it worked, but not ALWAYS, so adding even BouncyCastle provider was unreliable (failed with same error, every other time or so). I guess somewhere in the Sun SSL implementation sometimes it choose D...
Is a view faster than a simple query?
...e the indexed view directly, or, more importantly, the query optimizer can select the view if it determines that the view can be substituted for some or all of the query in the lowest-cost query plan. In the second case, the indexed view is used instead of the underlying tables and their ordinary in...
jquery's append not working with svg element?
...would not render while the D3-generated ones did! I recommend using D3: d3.select('body').append('svg').attr('width','100%');
– chharvey
Dec 15 '14 at 21:36
3
...
How to join (merge) data frames (inner, outer, left, right)
...s these operations in SQL.
library(sqldf)
## inner join
df3 <- sqldf("SELECT CustomerId, Product, State
FROM df1
JOIN df2 USING(CustomerID)")
## left join (substitute 'right' for right join)
df4 <- sqldf("SELECT CustomerId, Product, State
FROM df1...
Link to all Visual Studio $ variables
...
Note that you may have to change the selection of the version. For instance, I have MSVS2008, and $(Configuration)(in 2013) is $(ConfigurationName) instead.
– sancho.s ReinstateMonicaCellio
Apr 7 '14 at 19:44
...
LINQ Aggregate algorithm explained
...ggregate help readability? In general I love LINQ because I think .Where, .Select, .OrderBy and so on greatly helps readability (if you avoid inlined hierarhical .Selects). Aggregate has to be in Linq for completeness reasons but personally I am not so convinced that .Aggregate adds readability comp...
Chrome developer tools: View Console and Sources views in separate views/vertically tiled?
...Open the three-dot menu in the upper right corner of the dev tools window.
Select 'Settings'.
"General" tab --> "Appearance" section
"Panel Layout"
share
|
improve this answer
|
...