大约有 44,000 项符合查询结果（耗时：0.0272秒） [XML]
Want to find records with no associated records in Rails
...drop the DISTINCT. Otherwise, I think you'd want to normalize out the data and index in that case. I might do that by creating a friend_ids hstore or serialized column. Then you could say Person.where(friend_ids: nil)
– Unixmonkey
Dec 20 '16 at 16:02
...
Difference between id and name attributes in HTML
What is the difference between the id and name attributes? They both seem to serve the same purpose of providing an identifier.
...
Best way to select random rows PostgreSQL
I want a random selection of rows in PostgreSQL, I tried this:
12 Answers
12
...
How can I create a table with borders in Android?
...out to display data as table, but I want a table with user-defined columns and rows with borders. Suggestions?
18 Answers
...
Can table columns with a Foreign Key be NULL?
... you can clearly indicate that this row is not to be used as a normal row, and can use the row as a way of providing a sort of dynamic default value for other rows.
– Ouroborus
Feb 21 '17 at 17:57
...
Facebook access token server-side validation for iPhone app
...developing iPhone application, that is based on communication with server, and I want to use Facebook authentication mechanisms.
...
SQL - Update multiple records in one query
...e syntax
UPDATE config t1 JOIN config t2
ON t1.config_name = 'name1' AND t2.config_name = 'name2'
SET t1.config_value = 'value',
t2.config_value = 'value2';
Here is SQLFiddle demo
or conditional update
UPDATE config
SET config_value = CASE config_name
WH...
How to set the id attribute of a HTML element dynamically with angularjs (1.x)?
...alue of its id attribute, which is the concatenation of a scope variable and a string ?
7 Answers
...
How to create a date and time picker in Android? [closed]
Is there any android widget that enable to pick the date and the time at the same time ?
I already use the basic time picker and date picker .
...
How to use ScrollView in Android?
...
Just make the top-level layout a ScrollView:
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<TableLayout
android:layout_width="matc...