Help me bit assignment project

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I have some trouble a bit with an assignment for school. Here are the following questions I need some answer for.

employee table_zpswtkoqjyh.jpg Photo by dao1001 | Photobucket[^]

employee table 2_zpsrqnsrmhf.jpg Photo by dao1001 | Photobucket[^]

Please help me answer a bit...

Thanks

What I have tried:

I used to tutorial create tables in SQLPLUS but it does not work for me.

Posted 25-Aug-16 7:39am

bearforever99

Updated 25-Aug-16 18:54pm

Blutfaust

v2

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2 solutions

Solution 1

Use Sql Server Management Studio and it's pretty simple: cretae table Sql Server Management Studio - Google Search[^] gives you loads of links, including video tutorials to guide you through.

Posted 25-Aug-16 8:18am

OriginalGriff

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Daniel Jones · Accepted Answer · 2016-08-25T18:54:00

PRIMARY KEY is a constraint indicates that a set of columns are unique and not NULL. Most implementations use an index to support this and in some implementation the primary key is also the clustering index for ordering the data in pages in disk storage.

FOREIGN KEY is a constraint that indicates that a set of columns refer to another set of columns in another table. Generally a foreign key can still be NULL, but if it is not NULL, then it has to be a valid key in the table it references and that also has to be unique. The key it references DOES NOT have to be the PRIMARY KEY, just a unique key