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apc vs eaccelerator vs xcache
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answered May 31 '09 at 0:28
David Snabel-CauntDavid Snabel-Caunt
55.4k1212 gold badges107107 silver badges132132 bronze badges
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Change a column type from Date to DateTime during ROR migration
...ge_date_format_in_my_table
Then in your migration file:
For Rails >= 3.2:
class ChangeDateFormatInMyTable < ActiveRecord::Migration
def up
change_column :my_table, :my_column, :datetime
end
def down
change_column :my_table, :my_column, :date
end
end
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How can I convert this foreach code to Parallel.ForEach?
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edited Jul 26 '13 at 9:06
Contango
61.6k5252 gold badges216216 silver badges263263 bronze badges
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FIND_IN_SET() vs IN()
... to the first non-digit (a comma in your case).
Thus,
companyID IN ('1,2,3') ≡ companyID IN (CAST('1,2,3' AS INT)) ≡ companyID IN (1)
In PostgreSQL, you could cast the string into array (or store it as an array in the first place):
SELECT name
FROM orders
JOIN company
ON company...
How can I initialise a static Map?
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edited Apr 11 '19 at 13:48
community wiki
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【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
...uetooth SIG）在2010年发布了跨时代的蓝牙4.0，它并不是蓝牙3.0的简单升级版本，而是全新的技术架构，蓝牙4.0版本分两种模式：单模蓝牙和双模蓝牙。常见的蓝牙音箱，是典型的双模蓝牙，它需要传输大量的音频数据。而小米手环...
Changing the color of the axis, ticks and labels for a plot in matplotlib
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3 Answers
3
Active
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how do I insert a column at a specific column index in pandas?
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388
see docs: http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.insert.html
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PHP best way to MD5 multi-dimensional array?
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13 Answers
13
Active
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