大约有 41,527 项符合查询结果（耗时：0.0442秒） [XML]
Rails raw SQL example
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HuyHuy
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What linux shell command returns a part of a string? [duplicate]
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edited Aug 28 '15 at 10:58
Willi Mentzel
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Ruby on Rails: how do I sort with two columns using ActiveRecord?
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edited Aug 27 '10 at 20:28
answered Aug 27 '10 at 20:22
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How to only get file name with Linux 'find'?
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How can I fill out a Python string with spaces?
...string is returned if width is less than len(s).
>>> 'hi'.ljust(10)
'hi '
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JPG vs. JPEG image formats
... Marwelln
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answered May 2 '14 at 9:03
herohuyongtaoherohuyongtao
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Oracle Differences between NVL and Coalesce
...AS val
FROM dual
CONNECT BY
level <= 10000
)
This runs for almost 0.5 seconds, since it generates SYS_GUID()'s, despite 1 being not a NULL.
SELECT SUM(val)
FROM (
SELECT COALESCE(1, LENGTH(RAWTOHEX(SYS_GUID()))) AS val
FROM dua...
psycopg2: insert multiple rows with one query
...s located in another city.
I found out that using this method was about 10 times faster than executemany. In my case tup is a tuple containing about 2000 rows. It took about 10 seconds when using this method:
args_str = ','.join(cur.mogrify("(%s,%s,%s,%s,%s,%s,%s,%s,%s)", x) for x in tup)
cur.ex...
Oracle query to fetch column names
...org/examples/163.html
– pri_dev
Jan 10 '12 at 8:33
I also had to add and virtual_column = 'NO' to my query.
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How to prevent SIGPIPEs (or handle them properly)
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