大约有 44,000 项符合查询结果（耗时：0.0327秒） [XML]
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
..., i.e. upsert.
Comparison with ON DUPLICATE KEY UPDATE.
Quick explanation.
For usage see the manual - specifically the conflict_action clause in the syntax diagram, and the explanatory text.
Unlike the solutions for 9.4 and older that are given below, this feature works with multiple conflicting row...
How do I UPDATE from a SELECT in SQL Server?
...t it to MySQL and share with everyone. I'm sure lots of people are looking for a MySQL version solution
– Roger Ray
Nov 27 '13 at 3:34
1
...
How can I change CSS display none or block property using jQuery?
...
@GenericTypeTea: #id used for ids what about if I want to use class?
– AabinGunz
Aug 23 '11 at 12:43
29
...
MySQL select one column DISTINCT, with corresponding other columns
...practice I've successfully used this kind of queries with ORDER BY clause, for instance you could add ORDER BY id ASC/DESC and MySQL would return consistent results every time you would execute the query. But i would be sure whether anyone should use undocumented features in production environment.
...
jQuery selector regular expressions
...
James Padolsey created a wonderful filter that allows regex to be used for selection.
Say you have the following div:
<div class="asdf">
Padolsey's :regex filter can select it like so:
$("div:regex(class, .*sd.*)")
Also, check the official documentation on selectors.
...
How to display multiple notifications in android
...
Simple notification_id needs to be changable.
Just create random number for notification_id.
Random random = new Random();
int m = random.nextInt(9999 - 1000) + 1000;
or you can use this method for creating random number as told by tieorange (this will never get repeated):
int m =...
how to use ng-option to set default value of select element
...g-controller="MyCtrl">
<select ng-model="prop.value" ng-options="v for v in prop.values">
</select>
</div>
function MyCtrl($scope) {
$scope.prop = {
"type": "select",
"name": "Service",
"value": "Service 3",
"values": [ "Service 1", "Service 2", "Se...
How can I get LINQ to return the object which has the max value for a given property? [duplicate]
...
.OrderByDescending(i=>i.id).Take(1)
Regarding the performance concern, it is very likely that this method is theoretically slower than a linear approach. However, in reality, most of the time we are not dealing with the data set that is big enough to make any difference.
If pe...
Include intermediary (through model) in responses in Django Rest Framework
... model = Membership
fields = ('id', 'name', 'join_date', )
for any modern implementations
share
|
improve this answer
|
follow
|
...
How do I map lists of nested objects with Dapper
I'm currently using Entity Framework for my db access but want to have a look at Dapper. I have classes like this:
7 Answer...