Dec 2, 2012 · Or if I set it to primary key, it is automatically not null by default? e.g: CREATE TABLE Person( PersonId NUM(20) NOT NULL, ...
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Mar 7, 2022 · Hi, I have seen few examples in docs that creates tables having primary key column , but explicitly defined again with NOT NULL constraint.
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Hi Tom, I just got one question. In one of the table design, developer came up with the question, Why should one use Primary Key and why not Unique index + ...
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I have a table with 4 columns which would uniquely identify a row. For each row, two of these columns will always be populated. The other two columns will ...
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Sep 22, 2010 · Hello Gurus, I was asked in an interview about difference between Primary and Unique keys. I told about Unique keys can accept null values ...
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Aug 17, 2016 · I'd like to use Rails 4 since that's what the lesson is in. How do I fix this and/or how would I find the answer?
Nov 21, 2017 · Solved: Hi, I have a workflow which reads an API, parses JSON data and then needs to update / insert new records into an Oracle table.
Jul 16, 2012 · This is really a question of how your users will be accessing the data. By composite key - I am assuming these columns to be the unique ...
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