Updating datbase


19-Aug-2017 04:58

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In this lesson, we will look at how to update a database, i.e., edit the values of existing fields in the table.

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The rows represent instances of that type of entity (such as "Lee" or "chair") and the columns representing values attributed to that instance (such as address or price). Rows in a table can be linked to rows in other tables by adding a column for the unique key of the linked row (such columns are known as foreign keys).

Most relational database designs resolve many-to-many relationships by creating an additional table that contains the PKs from both of the other entity tables—the relationship becomes an entity; the resolution table is then named appropriately and the two FKs are combined to form a PK.

The migration of PKs to other tables is the second major reason why system-assigned integers are used normally as PKs; there's seldom efficiency nor clarity in migrating a bunch of other types of columns.

of the programming within a RDBMS is accomplished using stored procedures (SPs).

Often procedures can be used to greatly reduce the amount of information transferred within and outside of a system.Codd showed that data relationships of arbitrary complexity can be represented by a simple set of concepts.