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What's the best manner of implementing a social activity stream? [closed]
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I have created such system and I took this approach:
Database table with the following columns: id, userId, type, data, time.
userId is the user who generated the activity
type is the type of the activity (i.e. Wrote blog post, added photo, commented on user's photo)
data is a seriali...
MySQL DISTINCT on a GROUP_CONCAT()
I am doing SELECT GROUP_CONCAT(categories SEPARATOR ' ') FROM table . Sample data below:
6 Answers
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What's the purpose of SQL keyword “AS”?
You can set table aliases in SQL typing the identifier right after the table name.
9 Answers
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How to prevent a jQuery Ajax request from caching in Internet Explorer?
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you can define it like this :
let table = $('.datatable-sales').DataTable({
processing: true,
responsive: true,
serverSide: true,
ajax: {
url: "<?php echo site_url("your url"); ?>",
cache: false,
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What is ViewModel in MVC?
...might not be set from the view, it might be auto generated by the Employee table. And DateCreated might also be set in the stored procedure or in the service layer of your application. So Id and DateCreated are not needed in the view model. You might want to display these two properties when you v...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...数据表
创建一个测试数据表，sql如下：
CREATE TABLE users (
id INTEGER PRIMARY KEY,
name TEXT,
age INTEGER);
数据表信息
这时，可以查看一下表信息：
插入数据
往 users 表中插入...
ALTER TABLE, set null in not null column, PostgreSQL 9.1
I have a table with not null column, How to set a null value in this column as default?
4 Answers
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Alternate output format for psql
I am using PostgreSQL 8.4 on Ubuntu. I have a table with columns c1 through cN . The columns are wide enough that selecting all columns causes a row of query results to wrap multiple times. Consequently, the output is hard to read.
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How can I retrieve Id of inserted entity using Entity framework? [closed]
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Let's consider the following scenario:table1 is supposed to generate an @@identity to use it in table2. Both table1 and table2 are supposed to be in the same transaction for e.g. one SaveChange operation must save both table's data. @@identity won't be generated ...
Calling a function within a Class method?
...ults inside the class function? e.g I have a query that selects all from a table and then returns a fetch all result set. Is it possible to loop through that result set inside a classes function? e.g class query{ public function show(){ getResults(); while($stmt->fetchCollumn()){ ECHO RESULTS ...