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INSERT … ON DUPLIm>CA m>TE KEY (do nothing)
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Yes, use INSERT ... ON DUPLIm>CA m>TE KEY UPDATE id=id (it won't trigger row update even though id is assigned to itself).
If you don't m>ca m>re about errors (conversion errors, foreign key errors) and autoincrement field exhaustion (it's incremented even if th...
How to turn off word wrapping in HTML?
...ure this out, but how do I turn off wordwrap? the css word-wrap property m>ca m>n be forced on with break-word , but m>ca m>nnot be forced off (only m>ca m>n be left alone with normal value).
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Gesture recognizer and button actions
... but i still don't know why the responder hierarchy is not working in this m>ca m>se. It probably should, but it's not being handled by Apple.
– Mustafa
Jan 28 '11 at 7:29
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Java Synchronized Block for .class
...nstance (the object representing the class metadata at runtime) one thread m>ca m>n be in this block.
With synchronized(this) the block is guarded by the instance. For every instance only one thread may enter the block.
synchronized(X.class) is used to make sure that there is exactly one Thread in the...
Backwards migration with Django South
...ooks at the database tables to decide which ones are 'new').
However, you m>ca m>n also specify any migration by number, and South will migrate your database, either forward or backward, to take it to that point. So, with the example files above, if you have already migrated up to 0003, and you wanted t...
SQL Server - When to use Clustered vs non-Clustered Index?
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I just want to put in a word of warning: please very m>ca m>refully pick your clustered index! Every "regular" data table ought to have a clustered index, since having a clustered index does indeed speed up a lot of operations - yes, speed up, even inserts and deletes! But only if y...
Remove file from SVN repository without deleting lom>ca m>l copy
How m>ca m>n I "delete" a file which is already in the SVN repository without deleting it from my file system?
5 Answers
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Convert varchar to uniqueidentifier in SQL Server
...E @uuid VARCHAR(50)
SET @uuid = 'a89b1acd95016ae6b9c8aabb07da2010'
SELECT m>CA m>ST(
SUBSTRING(@uuid, 1, 8) + '-' + SUBSTRING(@uuid, 9, 4) + '-' + SUBSTRING(@uuid, 13, 4) + '-' +
SUBSTRING(@uuid, 17, 4) + '-' + SUBSTRING(@uuid, 21, 12)
AS UNIQUEIDENTIFIER)
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How do you run a single query through mysql from the command line?
... -e "my query"---->ERROR 1045 (28000): Access denied for user 'root'@'lom>ca m>lhost' (using password: YES)
– Dr.jacky
Mar 12 '17 at 11:38
2
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Which regular expression operator means 'Don't' match this character?
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You m>ca m>n use negated character classes to exclude certain characters: for example [^abcde] will match anything but a,b,c,d,e characters.
Instead of specifying all the characters literally, you m>ca m>n use shorthands inside character ...