Dec 2, 2012 · Oracle does not require primary keys to be specified as not null in the table declaration, as I demonstrated. I assumed Oracle was the RDBMS in ...
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why a primary key column needs again NOT NULL constraint ...
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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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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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Apr 21, 2021 · It's true that a primary key is always implicitly NOT NULL and UNIQUE. But in particular with the MySQL implementation, here are a couple of ...
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?
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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Oct 21, 2020 · Here are some considerations if you expected to have a NULL value inserted (not an empty string):. Find out what is the impact of inserting a ...
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