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How do you rename a table in SQLite 3.0?
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251
ALTER TABLE `foo` RENAME TO `bar`
SQLite Query Language: ALTER TABLE
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How do I write a custom init for a UIView subclass in Swift?
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211
The init(frame:) version is the default initializer. You must call it only after initializing y...
What is the difference between HashSet and List?
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215
Unlike a List<> ...
A HashSet is a List with no duplicate members.
Because a HashSet is...
Ruby on Rails console is hanging when loading
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edited Sep 7 '19 at 11:45
Peter Mortensen
26.5k2121 gold badges9292 silver badges122122 bronze badges
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Why does ~True result in -2?
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int(True) is 1.
1 is:
00000001
and ~1 is:
11111110
Which is -2 in Two's complement1
1 Flip all the bits, add 1 to the resulting number and interpret the result as a binary representation of the magnitude and add a negative sign (s...
Trying to understand CMTime and CMTimeMake
1) CMTimeMake(1,10) means duration of 1 second and timescale of 10, or 10 frames per second. This means 1s duration of video with 10 frames?
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How to set UICollectionViewDelegateFlowLayout?
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answered Oct 17 '12 at 0:38
John EstropiaJohn Estropia
16.8k44 gold badges3939 silver badges4747 bronze badges
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Getting “unixtime” in Java
Date.getTime() returns milliseconds since Jan 1, 1970. Unixtime is seconds since Jan 1, 1970. I don't usually code in java, but I'm working on some bug fixes. I have:
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How to detect READ_COMMITTED_SNAPSHOT is enabled?
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194
SELECT is_read_committed_snapshot_on FROM sys.databases
WHERE name= 'YourDatabase'
Return v...
UPDATE multiple tables in MySQL using LEFT JOIN
I have two tables, and want to update fields in T1 for all rows in a LEFT JOIN.
5 Answers
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