Primary Key vs Unique Key - shikshaglbe

In a database, a primary key is a unique identifier for a record. It can be used to identify a specific row in a table. A primary key is usually made up of one or more columns in a table that contain unique values. A unique key is similar to a primary key, but it can be made up of multiple columns. A unique key ensures that the combination of values in those columns is unique across the whole table.A primary key is a field in a database table that contains a unique value for each record. A unique key is a field in a database table that can contain duplicate values. A primary key must be unique, but a unique key does not have to be primary. A primary key can be used to create a foreign key in another table, but a unique key cannot.A primary key is a column or set of columns in a database table that uniquely identify each row in the table. A unique key is a column or set of columns in a database table that can be used to uniquely identify each row in the table.A primary key is a column or set of columns that uniquely identify a row in a table. A unique key is a column or set of columns that uniquely identify a row in a table, but allows for NULL values. In other words, a primary key can not have any duplicates, but a unique key can have one NULL value.Primary key is a column or set of columns that uniquely identify a row in a table. A primary key cannot have NULL values. A table can have only one primary key.Unique key is a column or set of columns that uniquely identify a row in a table. A unique key can have NULL values. A table can have more than one unique key.A primary key is a column or set of columns in a table that contains a unique value for each row. A unique key is a column or set of columns in a table that ensures that no two rows in the table have the same values. A primary key can be a unique key, but it does not have to be. A unique key can be null, while a primary key cannot.A primary key is a column or set of columns in a relational database table that uniquely identifies each row in the table. A unique key is a column or set of columns in a relational database table that uniquely identifies each row in the table, but allows for NULL values.When it comes to databases, a primary key is a unique identifier for a record. A unique key is a constraint that ensures that all values in a column are different. A primary key can be either a natural key or a synthetic key. A natural key is a column (or set of columns) that uniquely identifies an entity without artificial additions. For example, a driver's license number or Social Security number could be used as the primary key for an individual. A synthetic key, on the other hand, is generated by the database and does not have any intrinsic meaning. In most cases, a synthetic key is used when no natural key exists.A primary key is a column or set of columns that uniquely identify a row in a table. A primary key can be either a natural key or a surrogate key. A unique key is a column or set of columns that ensures that the values in the column are unique across all rows in the table. A unique key can be either a primary key or a non-primary key.A primary key is a column or set of columns that uniquely identify a row in a table. A unique key is a column or set of columns that uniquely identify a row in a table. A primary key can be a unique key, but it does not have to be. A unique key can be null, while a primary key cannot.

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