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How to truncate a foreign key constrained table?
...ata integrity.
Option 1:
Remove constraints
Perform TRUNCATE
Delete manually the rows that now have references to nowhere
Create constraints
Option 2: suggested by user447951 in their answer
SET FOREIGN_KEY_CHECKS = 0;
TRUNCATE table $table_name;
SET FOREIGN_KEY_CHECKS = 1;
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Search for string and get count in vi editor
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:g/xxxx/d
This will delete all the lines with pattern, and report how many deleted. Undo to get them back after.
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Do threads have a distinct heap?
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No. All threads share a common heap.
Each thread has a private stack, which it can quickly add and remove items from. This makes stack based memory fast, but if you use too much stack memory, as occurs in infinite recursion, yo...
select * vs select column
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It always pulls a tuple (except in cases where the table has been vertically segmented - broken up into columns pieces), so, to answer the question you asked, it doesn't matter from a performance perspective. However, for many other reasons, (below) you should always select specifically those co...
Where is Java's Array indexOf?
I must be missing something very obvious, but I've searched all over and can't find this method.
13 Answers
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Couldn't register with the bootstrap Server
...r from this by unplugging the iPad, powering it down and back up, clearing all XCode caches and targets, and doing a clean build.
I'm running XCode 3.5.4 and iOS 4.2.1
Hope this helps someone.
-Mike
UPDATE:
Same problem running Xcode 4.3 and iOS5 - just power-cycle the device.
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On logout, clear Activity history stack, preventing “back” button from opening logged-in-only Activi
All activities in my application require a user to be logged-in to view. Users can log out from almost any activity. This is a requirement of the application. At any point if the user logs-out, I want to send the user to the Login Activity . At this point I want this activity to be at the bottom of...
What are the functional differences between NW.js, Brackets-Shell and Electron?
...ide on node-webkit is node.js and npm. The package management of npm is really nice, and node has well done filesystem access.
Brackets-shell looked interesting, but other than a nice IDE I didn't really get what made this one as good or better than the rest. They are very clear that "The bracket...
Can you have if-then-else logic in SQL? [duplicate]
...SE statement is the closest to an IF statement in SQL, and is supported on all versions of SQL Server:
SELECT CASE <variable>
WHEN <value> THEN <returnvalue>
WHEN <othervalue> THEN <returnthis>
ELSE <returndefaultcase>
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jQuery: select all elements of a given class, except for a particular Id
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From the documentation: All selectors are accepted inside :not(), for example: :not(div a) and :not(div,a) so just use the comma delimited selectors to do multiple (".thisclass:not(#thisid,#thatid)").doAction();
– Chase
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