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Showing empty view when ListView is empty
For some reason the empty view, a TextView in this case, always appears even when the ListView is not empty. I thought the ListView would automatically detect when to show the empty view.
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1052: Column 'id' in field list is ambiguous
...dly, my answers use ANSI-92 JOIN syntax (yours is ANSI-89). While they perform the same, ANSI-89 syntax does not support OUTER joins (RIGHT, LEFT, FULL). ANSI-89 syntax should be considered deprecated, there are many on SO who will not vote for ANSI-89 syntax to reinforce that. For more informati...
When should I use cross apply over inner join?
...ose cases where INNER JOIN will work as well?
See the article in my blog for detailed performance comparison:
INNER JOIN vs. CROSS APPLY
CROSS APPLY works better on things that have no simple JOIN condition.
This one selects 3 last records from t2 for each record from t1:
SELECT t1.*, t2o.*...
Hibernate throws org.hibernate.AnnotationException: No identifier specified for entity: com..domain.
...ate docs write:
There is no difference between a view and a base table for a Hibernate mapping. This is transparent at the database level
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How to select html nodes by ID with jquery when the id contains a dot?
...IDs must be unique throughout the document. What would "#id.class" be good for? I mean, you can't be any more specific than "#id", can you?
– Tomalak
Mar 3 '09 at 10:19
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Can I bind an array to an IN() condition?
...der using PDO. The use case here is attempting to pass an array of values for use with an IN() condition.
21 Answers
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PostgreSQL DISTINCT ON with different ORDER BY
...e to add the address_id to the order by.
Alternatively, if you're looking for the full row that contains the most recent purchased product for each address_id and that result sorted by purchased_at then you're trying to solve a greatest N per group problem which can be solved by the following appro...
Extension · App Inventor 2 中文网
...sparentBackground
UIEnhance
AI2Utils
Component for AI2Utils
Properties
None
Events
None
Methods
FindContactsByName(name,fuzzyMatch)
通过姓名查找通讯录，返回 (联系人,手机号) ...
Join/Where with LINQ and Lambda
...in an sql "join" statement)
meta => meta.Post_ID, // Select the foreign key (the second part of the "on" clause)
(post, meta) => new { Post = post, Meta = meta }) // selection
.Where(postAndMeta => postAndMeta.Post.ID == id); // where statement
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unique object identifier in javascript
...ed to do some experiment and I need to know some kind of unique identifier for objects in javascript, so I can see if they are the same. I don't want to use equality operators, I need something like the id() function in python.
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