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Search results for primary key



A primary key is the field(s) in a table that uniquely defines the row in the table; the values in the primary key are always unique. A foreign key is ...
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Programming Interview Questions | foreign key database primary key sql all All
Both primary key and unique enforce uniqueness of the column on which they are defined. But by default primary key creates a clustered index on the co ...
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Programming Interview Questions | sql primary key unique key dba all All
Both primary key and unique enforce uniqueness of the column on which they are defined. But by default primary key creates a clustered index on the co ...
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Programming Interview Questions | sql primary key unique key difference all All
The primary key can't be a primitive type--use the primitive wrapper classes, instead. For example, you can use java.lang.Integer as the primary key c ...
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Programming Interview Questions | ejb primary key entity bean all All