大约有 44,500 项符合查询结果（耗时：0.0482秒） [XML]
ORDER BY the IN value list
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You can do it quite easily with (introduced in PostgreSQL 8.2) VALUES (), ().
Syntax will be like this:
select c.*
from comments c
join (
values
(1,1),
(3,2),
(2,3),
(4,4)
) as x (id, ordering) on c.id = x.id
order by x.ordering
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How to replace NaN values by Zeroes in a column of a Pandas Dataframe?
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12 Answers
12
Active
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How do you clear a slice in Go?
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123
It all depends on what is your definition of 'clear'. One of the valid ones certainly is:
slic...
RabbitMQ message size and types
...ant to read up on their performance measures:
http://www.rabbitmq.com/blog/2012/04/17/rabbitmq-performance-measurements-part-1/
http://www.rabbitmq.com/blog/2012/04/25/rabbitmq-performance-measurements-part-2/
Queues are pretty light weight, you will most likely be limited by the number of connectio...
What is the syntax rule for having trailing commas in tuple definitions?
...id expression:
a = [
"a",
"b"
"c"
]
Assuming that started as a 2 element list that was later extended it has gone wrong in a perhaps not immediately obvious way. Always include the trailing comma and you avoid that trap.
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How to resize a custom view programmatically?
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255
Android throws an exception if you fail to pass the height or width of a view.
Instead of crea...
vim line numbers - how to have them on by default?
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edited Jul 27 '18 at 1:37
Kenan
7,65533 gold badges2727 silver badges4343 bronze badges
a...
Android Studio: Default project directory
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answered Jul 30 '13 at 12:43
Rik MartinsRik Martins
97577 silver badges44 bronze badges
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#1071 - Specified key was too long; max key length is 1000 bytes
... left substring of the data. Most of your data will be a lot shorter than 255 characters anyway.
You can declare a prefix length per column as you define the index. For example:
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KEY `index` (`parent_menu_id`,`menu_link`(50),`plugin`(50),`alias`(50))
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But what's the best prefix length fo...