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How to get distinct values for non-key column fields in Laravel?
...lder you can do it this way:
$users = DB::table('users')
->select('id','name', 'email')
->groupBy('name')
->get();
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使用App Inventor扩展实现多点触控：Rotation Detector 旋转检测 · App Inventor 2 中文网
... 内容
带有旋转检测器扩展组件的演示应用程序
如何构建旋转检测器扩展
使用 RotationDetector 扩展组件的演示应用程序
如何构建旋转检测器扩展
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Illegal mix of collations MySQL Error
...E your_table_name CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;
MySQL sneaks swedish in there sometimes for no sensible reason.
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follo...
Remove ActiveRecord in Rails 3
... line that loads the module for your database. This could be the line gem "mysql" for example.
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Where are my postgres *.conf files?
...alives_idle = 0 # TCP_KEEPIDLE, in seconds;
# 0 selects the system default
#tcp_keepalives_interval = 0 # TCP_KEEPINTVL, in seconds;
# 0 selects the system default
#tcp_keepalives_count = 0 # TCP_KEEPCNT;
# 0 selects the...
How Scalable is SQLite? [closed]
I recently read this Question about SQLite vs MySQL and the answer pointed out that SQLite doesn't scale well and the official website sort-of confirms this , however.
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Update statement with inner join on Oracle
...sn't valid in Oracle. You can do this:
UPDATE table1 SET table1.value = (SELECT table2.CODE
FROM table2
WHERE table1.value = table2.DESC)
WHERE table1.UPDATETYPE='blah'
AND EXISTS (SELECT table2.CODE
FROM table2
...
sql primary key and index
...dex
ON MyTable(ID)
INCLUDE (Name, Address)
So, when you use this query:
SELECT ID, Name, Address FROM MyTable WHERE ID > 1000
SQL Server will give you the result only using the index you've created and it'll not read anything from the actual table.
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SQL join: selecting the last records in a one-to-many relationship
... want to get a list of all customers along with their last purchase in one SELECT statement. What is the best practice? Any advice on building indexes?
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关于App Inventor 2过程积木，被问最多的6个问题 - App应用开发 - 清泛IT社...
...要参数的例子</b>：每次启动App时播放同一个开场音效、重置游戏界面到初始状态——这类行为没有"变化量"，直接调用即可。<br><br><b>需要参数的例子</b>：假设你要做一个"计算矩形面积"的过程，每次传入的长和宽不一样，那就...