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a well formed primary key will guarantee that you can always identify a unique row. however, what should you use to ensure that you maintain uniqueness in your table for a set of fields that is not the primary key?

Sagot :

Fixed-length character data types are the second-best option for a primary key after integer (number) data types.

Each record in a table is given a special identification by the PRIMARY KEY constraint. Primary keys cannot have NULL values and must have UNIQUE values. There can only be one primary key in a table, and this primary key may include one or more columns (fields). The primary key (PK) of the table is this column, or set of columns, and it upholds the table's entity integrity. Primary key constraints are frequently defined on an identity column because they ensure unique data. Each row of data values in a database table in a relational database is uniquely identified by a candidate key.

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