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Can I make the foreign key field optional in Django model

... Abid AAbid A 5,99833 gold badges2828 silver badges3030 bronze badges ...
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How to enable C++11 in Qt Creator?

... answered Jun 5 '13 at 21:18 AliAli 49.2k2323 gold badges151151 silver badges240240 bronze badges ...
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Read an Excel file directly from a R script

... | edited Sep 3 '14 at 23:56 David LeBauer 27.6k2727 gold badges101101 silver badges174174 bronze badges ...
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nil detection in Go

... 183 The compiler is pointing the error to you, you're comparing a structure instance and nil. They'r...
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The server committed a protocol violation. Section=ResponseStatusLine ERROR

... Darin DimitrovDarin Dimitrov 930k250250 gold badges31523152 silver badges28432843 bronze badges ...
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Is calculating an MD5 hash less CPU intensive than SHA family functions?

...On my Intel x86 (Core2 Quad Q6600, 2.4 GHz, using one core), I get this in 32-bit mode: MD5 411 SHA-1 218 SHA-256 118 SHA-512 46 and this in 64-bit mode: MD5 407 SHA-1 312 SHA-256 148 SHA-512 189 Figures are in megabytes per second, for a "long" message (this is wh...
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What are the “loose objects” that the Git GUI refers to?

... An object (blobs, trees, and commits) with SHA say - 810cae53e0f622d6804f063c04a83dbc3a11b7ca will be stored at .git/objects/81/0cae53e0f622d6804f063c04a83dbc3a11b7ca ( the split in first two characters to improve performance of the File system as now not all the objects are stored...
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How to deal with INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES without uninstall?

... 319 It means the new copy of your application (on your development machine) was signed with a diff...
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SVN upgrade working copy

... | edited Nov 3 '11 at 8:48 answered Nov 3 '11 at 8:41 ...
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Entity Framework Refresh context?

...n-us/library/system.data.entity.infrastructure.dbentityentry.reload(v=vs.113).aspx#M:System.Data.Entity.Infrastructure.DbEntityEntry.Reload share | improve this answer | foll...