#Alternote tables how to

The common attribute used for referencing is “Product ID” which is also termed as Foreign Key.

This table is referencing the Product Information table to know about the details of the product bought by a customer. Sample Input : Consider the Table Customer Information which consists data about customers who bought products from an E-Commerce site.

#Alternote tables how to

In this article, we are going to see how to create an ALTERNATE Key in SQL using sample tables as shown. An Alternate Key can be a set of a single attribute or multiple attributes.A Foreign Key can’t be an Alternate Key as it is only used to reference another table.For a table with a single Candidate Key which has to be the Primary Key will not contain any Alternate Key.

A Primary Key can’t be an Alternate Key.Some important points about Alternate Keys are as follows : Hence, the other Candidate Keys which are not used as a Primary Key are the “Alternate Keys”. There can be many Candidate Keys for a given table and out of all these the Database Administrators selects only one of these as the Primary Key. In other words, we can define the Alternate key as the set of Candidate Keys other than the Primary Key. ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.The Role column and select Alternate Name table. Repeat step 1 and browse for the alternate name table.The Role column and select Primary table. In the Create Address Locator dialog box, click the Browse button that is next to the Reference Data text box.The following steps describe how to add the alternate table and specify the fields in the Create Address Locator dialog box. See the Creating an address locator topic to learn how to create an address locator. By combining these tasks, an address locator can be created that includes alternate names. There are, however, some additional elements that must be included.

Learn more about reference data requirements for the variety of address locator styles Building an address locator for alternate namesĬreating address locators that use alternate name tables is not very different from creating those that do not. For a street address, attributes including prefix direction, prefix type, street name, street type, and suffix direction are used for representing the alternate names. Table attributesĭepending on the address locator style you choose and the type of features you want to search, attributes in the alternate name table are similar to the table of the primary feature class. It can be either the object ID or a user ID field that can be used to join the Join ID from the alternate name table. The primary feature class must have a field that contains a unique ID value for each record. If one feature has multiple names, the Join ID field for the alternate names of the same feature contains the same value. The alternate name table must have an ID field that can be used to join the records to the primary feature class. Additional names can be added to the table. Each record represents one name for a feature. The alternate name table is a table that contains the fields for the additional names. Searching for a feature by all of its possible names can increase the success rate of matching. For example, Jefferson Rd is a new official name for the street that was previously called Old Country Rd. Names of features, such streets or cities, change over time.

Building an address locator for alternate names.