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Can I make the foreign key field optional in Django model

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Query a parameter (postgresql.conf setting) like “max_connections”

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setup cron tab to specific time of during weekdays

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wpf: how to show tooltip when button disabled by command?

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What is a message pump?

... Very nice and detailed answer. Just to add - there is also a special STA called the main STA, which is the first STA created. Which should ideally be the one created by your UI thread. The main STA is where components with threading model=...
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Why does Eclipse automatically add appcompat v7 library support whenever I create a new project?

...look at developer.android.com/tools/support-library/index.html for further details. – Halim Qarroum Mar 30 '14 at 1:32 ...
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Using C# reflection to call a constructor

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What is a provisioning profile used for when developing iPhone applications?

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Rebasing a branch including all its children

...he dry run (-n) option before you try it for real. It may be a little more detail than you really want, but it will show you what it's going to try to rebase, and onto what. Might save you some grief. #!/bin/bash CACHE_DIR=.git/auto-rebase TODO=$CACHE_DIR/todo TODO_BACKUP=$CACHE_DIR/todo.backup CO...
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What is mattr_accessor in a Rails module?

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