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Biology
22 December, 00:06
What is a primary key
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Kyra Contreras
22 December, 00:24
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A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.
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Cara
22 December, 00:35
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A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.
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