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obeyal77
06.06.2021 •
Computers and Technology
A primary key ensures that —- are unique ?
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Ответ:
To qualify as a primary key, it is the data within each column that must be unique, not simply the column names themselves. At the same time, no value in the columns can be blank or NULL. A primary key, therefore, is used to ensure the data in a specific column is unique.
Explanation:
hope it's help
Ответ:
I think PDF
Explanation:
Because a poster is a picture.