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Create an index on a huge MySQL production table without table locking
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[2017] Update: MySQL 5.6 has support for online index updates
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-operations.html#online-ddl-index-syntax-notes
In MySQL 5.6 and higher, the table remains available fo...
When to use RSpec let()?
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edited Jan 10 '19 at 20:07
Armand Fardeau
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answered Mar 19 '11 at 4:04
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Calling a class function inside of __init__
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Azat Ibrakov
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answered Sep 28 '12 at 19:45
Lewis DiamondLewis...
Change auto increment starting number?
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528
You can use ALTER TABLE to change the auto_increment initial value:
ALTER TABLE tbl AUTO_INCRE...
Is there an SQLite equivalent to MySQL's DESCRIBE [table]?
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answered Jul 25 '10 at 18:27
Ned BatchelderNed Batchelder
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How to verify a user's password in Devise
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269
I think this is a better, and more elegant way of doing it:
user = User.find_by_email(params[...
Restricting input to textbox: allowing only numbers and decimal point
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How to use regex in String.contains() method in Java
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String.contains
String.contains works with String, period. It doesn't work with regex. It will...
How do pointer to pointers work in C?
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Let's assume an 8 bit computer with 8 bit addresses (and thus only 256 bytes of memory). This is part of that memory (the numbers at the top are the addresses):
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
+----+----+----+----+----+----+----+----+----+----...
Java - escape string to prevent SQL injection
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