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来源： https://stackoverflow.com/questions/1134848/is-it-safe-to-delete-the-3-default-databases-created-during-a-postgresql-install

来源： https://stackoverflow.com/questions/1144264/c-member-pointer-initialised

来源： https://stackoverflow.com/questions/1144264/c-member-pointer-initialised

来源： https://stackoverflow.com/questions/1144264/c-member-pointer-initialised

问题 Starting with Git version 2.0, the default value for the push.default config option if not specified in the user's config, is simple . According to the documentation, this means: in centralized workflow, work like upstream with an added safety to refuse to push if the upstream branch's name is different from the local one. When pushing to a remote that is different from the remote you normally pull from, work as current. This is the safest option and is suited for beginners. In playing around

问题 What is the difference between: CREATE PROCEDURE [dbo].[MyProcedure] @MyArgument INT NULL and CREATE PROCEDURE [dbo].[MyProcedure] @MyArgument INT = NULL I used the first one, and it worked fine in SQL Server 2016. But SQL Server 2012 did not accept it. Both works on SQL Server 2016, and I am using the second one now without problem. But it would be interesting to know the difference. Thanks! 回答1: They don't do the same thing. The second one defines a default value for the case that the

问题 The default DataTemplate in a wpf application displays the result of the .ToString() method. I'm developing an application where the default DataTemplate should display nothing. I've tried: <Grid.Resources> <DataTemplate DataType="{x:Type System:Object}"> <Grid></Grid> </DataTemplate> </Grid.Resources> But this doesn't work. Does anyone knows if this is possible without specifiing a specific DataTemplate for every class type in the application? 回答1: I know of no way to do this. As per Joe's

问题 So my problem is fairly simple. When I started to develop my website my default zoom level on my Firefox browser turned out to be, well, less than 100%. (Maybe 70%) Which means that what I have designed so far is actually in zoomed out mode, which in turn means that my users or web visitors will see something that looks very zoomed in when they look at it with 100% mode. This can easily be solved by holding Ctrl and scrolling you mouse wheel twice. Obviously though I can't encourage people to

问题 I know, with Ubuntu, you can set default values for environment variables in /etc/environment ; I do not see that file in Alpine linux. Is there a different location for setting system-wide defaults? 回答1: It seems that /etc/profile is the best place I could find. At least, some environment variables are set there: export CHARSET=UTF-8 export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin export PAGER=less export PS1='\h:\w\$ ' umask 022 for script in /etc/profile.d/*.sh ;

问题 I would like to supply my regular expression with a 'default' value, so if the thing I was looking for is not found, it will return the default value as if it had found it. Is this possible to do using regex? 回答1: It sounds like you want some sort of regex syntax that says "if the regexp does not match any part of the given string pretend that it matched the following substring: 'foobar'". Such a feature does not exist in any regexp syntax I've seen. You'll probably need to something like