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How to convert SQL Query result to PANDAS Data Structure?
... way to do it, as you don't need to manually use .keys() to get the column index. Probably Daniel's answer was written before this method existed. You can also use pandas.io.sql.read_frame()
– RobinL
Oct 13 '13 at 13:54
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How to create a directory in Java?
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-1: That is actually a really bad technique to create a directory. The access to the FS is not reserved to a dedicated resource. Between if(!theDir.exists()) and theDir.mkdir() the status could have changed, as well as it could change in between not creating the di...
How to upper case every first letter of word in a string? [duplicate]
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@kd i tryed google.at/search?q=java+word+uppercase thxn anyway
– Chris
Jul 19 '09 at 13:17
1
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Rails 3: Get Random Record
... big tables but more sql-style
UPD. You can use the following trick on an indexed column (PostgreSQL syntax):
select *
from my_table
where id >= trunc(
random() * (select max(id) from my_table) + 1
)
order by id
limit 1;
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How to use the 'main' parameter in package.json?
...meter in your package.json if the entry point to your package differs from index.js in its root folder. For example, people often put the entry point to lib/index.js or lib/<packagename>.js, in this case the corresponding script must be described as main in package.json.
You can't have two scr...
How to find and return a duplicate value in array
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Simply find the first instance where the index of the object (counting from the left) does not equal the index of the object (counting from the right).
arr.detect {|e| arr.rindex(e) != arr.index(e) }
If there are no duplicates, the return value will be nil.
I be...
How can I make SQL case sensitive string comparison on MySQL?
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@adjwilli If the column was a part of an index, you will suffer a performance hit on queries reliant on that index. To maintain performance, you need to actually alter the table.
– dshin
Sep 19 '13 at 18:50
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How do I modify fields inside the new PostgreSQL JSON datatype?
... create_missing boolean default true)
path can contain JSON array indexes too & negative integers that appear there count from the end of JSON arrays. However, a non-existing, but positive JSON array index will append the element to the end of the array:
SELECT jsonb_set('{"a":[null,{"b...
How to use ADB Shell when Multiple Devices are connected? Fails with “error: more than one device an
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Should be set ANDROID_SERIAL=7f1c864e, ie. without quotes.
– Bjonnfesk
Oct 8 '19 at 20:17
1
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MySQL order by before group by
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For scaling, the compound INDEX(post_author, post_date) is important.
– Rick James
Mar 1 '15 at 16:08
1
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