大约有 40,000 项符合查询结果（耗时：0.0544秒） [XML]
COUNT DISTINCT with CONDITIONS
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You can try this:
select
count(distinct tag) as tag_count,
count(distinct (case when entryId > 0 then tag end)) as positive_tag_count
from
your_table_name;
The first count(distinct...) is easy.
The second one, looks somewhat complex...
How to check existence of user-define table type in SQL Server 2008?
...y. You can't use OBJECT_ID to search for a table type by name -- check out SELECT name FROM sys.objects WHERE type = 'TT'
– NReilingh
Nov 29 '15 at 9:17
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MySQL show current connection info
...e are MYSQL functions you can use. Like this one that resolves the user:
SELECT USER();
This will return something like root@localhost so you get the host and the user.
To get the current database run this statement:
SELECT DATABASE();
Other useful functions can be found here: http://dev.mys...
T-SQL CASE Clause: How to specify WHEN NULL
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Given your query you can also do this:
SELECT first_name + ' ' + ISNULL(last_name, '') AS Name FROM dbo.person
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Where is the 'tests output pane'?
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This is the correct answer. Selecting "Tests" from the combobox is the key.
– Keith
Aug 29 '14 at 14:51
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Find a Pull Request on Github where a commit was originally created
...can just go to github and enter the SHA into the search bar, make sure you select the "Issues" link on the left.
UPDATED 13 July 2017
Via the Github UI there is a now a really easy way to do this. If you are looking at a commit in the list of commits in a branch in the UI, click on the link to the...
Debugging WebSocket in Google Chrome
...ad your page and initiate the WebSocket connections
Click the Network Tab.
Select the WebSocket connection from the list on the left (it will have status of "101 Switching Protocols".
Click the Messages sub-tab. Binary frames will show up with a length and time-stamp and indicate whether they are ma...
Remove a folder from git tracking
...th ways. If unselecting, it does not allow to push, but then I changed one char in another file which should be tracked. Still does not help
– Darius.V
Dec 13 '17 at 13:50
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foreach with index [duplicate]
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You can do the following
foreach (var it in someCollection.Select((x, i) => new { Value = x, Index = i }) )
{
if (it.Index > SomeNumber) //
}
This will create an anonymous type value for every entry in the collection. It will have two properties
Value: with the ori...
MySQL/SQL: Group by date only on a Datetime column
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Cast the datetime to a date, then GROUP BY using this syntax:
SELECT SUM(foo), DATE(mydate) FROM a_table GROUP BY DATE(a_table.mydate);
Or you can GROUP BY the alias as @orlandu63 suggested:
SELECT SUM(foo), DATE(mydate) DateOnly FROM a_table GROUP BY DateOnly;
Though I don't think...