大约有 44,000 项符合查询结果（耗时：0.0391秒） [XML]
SQL/mysql - Select distinct/UNIQUE but return all columns?
...
You're looking for a group by:
select *
from table
group by field1
Which can occasionally be written with a distinct on statement:
select distinct on field1 *
from table
On most platforms, however, neither of the above will work becau...
Rails 3 execute custom sql query without a model
...urns the actual results - what I want, while execute just returns status information.
– Paul Chernoch
Jun 9 '16 at 17:23
add a comment
|
...
Sending data back to the Main Activity in Android
...or entering data in a dialog box. In this case you should use startActivityForResult to launch your child Activity.
This provides a pipeline for sending data back to the main Activity using setResult. The setResult method takes an int result value and an Intent that is passed back to the calling Ac...
Nullable Foreign Key bad practice?
Let's say you have a table Orders with a foreign key to a Customer Id. Now, suppose you want to add an Order without a Customer Id, (whether that should be possible is another question) you would have to make the foreign key NULL... Is that bad practice or would you rather work with a link table bet...
.NET NewtonSoft JSON deserialize map to a different property name
...
can i use two JsonProperty for one filed?
– Ali Yousefi
May 11 '15 at 19:56
2
...
Repeat command automatically in Linux
...ape special characters that are part of the command that you are watching, for example: watch mysql dbname -e \"show processlist\;\"
– pfrenssen
Oct 9 '13 at 11:43
...
jQuery UI: Datepicker set year range dropdown to 100 years
...ected year ("c-nn:c+nn"), absolute ("nnnn:nnnn"), or combinations of these formats ("nnnn:-nn"). Note that this option only affects what appears in the drop-down, to restrict which dates may be selected use the minDate and/or maxDate options.
...
Provisioning Profiles menu item missing from Xcode 5
... on my iPad again. The problem is that in Xcode 5 I don't have a menu item for Library - Provisioning Profiles, and I don't know what could have happened. I restarted the computer, tried some things, but I really have no idea what I could do. How can I fix this problem?
...
How can I create an array with key value pairs?
...ow["datasource_id"]] = $row["title"];
}
$row["datasource_id"] is the key for where the value of $row["title"] is stored in.
share
|
improve this answer
|
follow
...
Return all enumerables with yield return at once; without looping through
I have the following function to get validation errors for a card. My question relates to dealing with GetErrors. Both methods have the same return type IEnumerable<ErrorInfo> .
...