大约有 32,294 项符合查询结果（耗时：0.0632秒） [XML]
MySQL InnoDB not releasing disk space after deleting data rows from table
... start the server and restore the database(s). With MySQL 5.5+ you can use what Josh said, and after changing all tables, stop the server, delete the huge .ibd and start it again.
– Leonel Martins
Feb 14 '17 at 13:12
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How does one reorder columns in a data frame?
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This is ok when you have a limited number of columns, but what if you have for example 50 columns, it would take too much time to type all column numbers or names. What would be a quicker solution?
– Herman Toothrot
Aug 30 '13 at 12:01
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rake db:schema:load vs. migrations
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It's unclear to me what the benefit of db:schema:load has other than shaving off a few seconds once throughout the development cycle. Have you ever worked with an app that took longer than 30 seconds to be built up? I'm currently working on a...
Postgres: SQL to list table foreign keys
...does this, and if you start psql with:
psql -E
it will show you exactly what query is executed. In the case of finding foreign keys, it's:
SELECT conname,
pg_catalog.pg_get_constraintdef(r.oid, true) as condef
FROM pg_catalog.pg_constraint r
WHERE r.conrelid = '16485' AND r.contype = 'f' ORDER...
Remove insignificant trailing zeros from a number?
...01231: "0"
0.10001: "0.1000"
"asdf": "NaN" (so no runtime error)
The somewhat problematic case is 0.10001. I ended up using this longer version:
r = (+n).toFixed(4);
if (r.match(/\./)) {
r = r.replace(/\.?0+$/, '');
}
1234870.98762341: "1234870.9876"
1230009100: "1230009100"
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Installing a local module using npm?
... It might not be original intent of the question, but it's probably what most people who find this through google want.
– Dusty J
Aug 11 '13 at 16:32
1
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Wait 5 seconds before executing next line
...is that in some cases (specifically testing) this is woefully inadequate. What if you need to sleep for 500ms before returning from the function, for instance to simulate a slow async http request?
– A.Grandt
Sep 22 '16 at 9:17
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How to determine a Python variable's type?
...you really do, you should know enough not to be looking to this answer for what to do.
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How to calculate a time difference in C++
What's the best way to calculate a time difference in C++? I'm timing the execution speed of a program, so I'm interested in milliseconds. Better yet, seconds.milliseconds..
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How to get box-shadow on left & right sides only
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@Hamish Yeah, that's what I did for now :-) Pity, one appealing feature of this approach is that it (usually) does not requre any helper <div> elements. :-)
– Frerich Raabe
Nov 11 '19 at 16:15
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