大约有 18,340 项符合查询结果（耗时：0.0242秒） [XML]
Select row with most recent date per user
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Query:
SQLFIDDLEExample
SELECT t1.*
FROM lms_attendance t1
WHERE t1.time = (SELECT MAX(t2.time)
FROM lms_attendance t2
WHERE t2.user = t1.user)
Result:
| ID | USER | TIME | IO |
-------------...
How do you perform a left outer join using linq extension methods
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For a (left outer) join of a table Bar with a table Foo on Foo.Foo_Id = Bar.Foo_Id in lambda notation:
var qry = Foo.GroupJoin(
Bar,
foo => foo.Foo_Id,
bar => bar.Foo_Id,
(x,y) => new { Foo = x, Bars = y })
.SelectMany(
x =...
PostgreSQL - max number of parameters in “IN” clause?
...using Posgresql's JDBC driver 9.1.
This is a test of "delete from x where id in (... 100k values...)" with the postgresql jdbc driver:
Caused by: java.io.IOException: Tried to send an out-of-range integer as a 2-byte value: 100000
at org.postgresql.core.PGStream.SendInteger2(PGStream.java:201)...
How to get the body's content of an iframe in Javascript?
...iframes content.
First get your iframe
var iframe = document.getElementById('id_description_iframe');
// or
var iframe = document.querySelector('#id_description_iframe');
And then use jQuery's solution
var iframeDocument = iframe.contentDocument || iframe.contentWindow.document;
It works ...
How to fix: android.app.RemoteServiceException: Bad notification posted from package *: Couldn't cre
... What if we try to set the textSize of the remote view as ret.setInt(id, "setTextSize", 20); It also crashes. I know we also have to provide the units, but how do I do that with such method signature. Any pointer??
– bitsabhi
Jan 28 '16 at 9:30
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JavaScript validation for empty input field
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<script type="text/javascript">
function validateForm() {
var a = document.forms["Form"]["answer_a"].value;
var b = document.forms["Form"]["answer_b"].value;
var c = document.forms["Form"]["answer_c"].value;
var d = document.forms["Form"]["answer_d"...
Implementing Comments and Likes in database
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Entity-relationship term for this is "category" (see the ERwin Methods Guide, section: "Subtype Relationships"). The category symbol is:
Assuming a user can like multiple entities, a same tag can be used for more than one entity but a comment is entity-specific, your model could look like this:...
iOS 7.0 No code signing identities found
...w or Edit existing Provisioning profile.
Download and install.
For BundleIdentifier.
com.yourcompanyName.Something (Put same as in AppId)
CodeSigningIdentity.
Select The Provisioning profile which you created.
s...
MYSQL Truncated incorrect DOUBLE value
...VI - XVIII',
name_eng = '16th to 18th centuries'
WHERE
category_id = 4768
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jQuery access input hidden value
How can I access <input type="hidden"> tag's value attribute using jQuery?
9 Answers
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