Every record in Salesforce has a.Id field that serves as the primary key for that object. The id is created when the record is inserted. To establish a foreign key, create a Lookup or a Master-Detail relationship from one object to another.
Full Answer
What is external key in Salesforce?
External Key is a very interesting and important feature given by Salesforce. It is very much helpful when we are importing some data from legacy system, means suppose the data in the old system needs to be migrated to salesforce and we want to avoid importing any duplicate records from that system into salesforce.
What is the difference between primary key and foreign key in database?
In master details relationship master table Id field is Primary key and master detail field in detal table is Foreign key. Primary key and Foreign key are relational database concepts.
How Salesforce will differentiate between records being imported from external system?
Then, how salesforce will come to know that on which basis, it should differentiate between the records being imported from external system. For this purpose, we can define some field from legacy data that will act as unique identifier in salesforce and we can map that field with a custom field in salesforce that has attribute External Id true.
Is it possible to import data from legacy system to Salesforce?
It is very much helpful when we are importing some data from legacy system, means suppose the data in the old system needs to be migrated to salesforce and we want to avoid importing any duplicate records from that system into salesforce.
What is Salesforce foreign key?
The foreign key field lives on the other table. It contains the value of the primary key field for the record that is to be associated. Tables should have a primary key–it's how each row in the table is uniquely identified.
How is a foreign key generated?
Foreign keys are used to establish and maintain relational links in the database. They are automatically generated, based on the associations and their connectivity. The foreign keys represent the relationship between tables. Each child table contains a copy of its parent table's primary key.
How do I create a primary key in Salesforce?
To designate the key in Salesforce CDP, select the SKU field in the Primary Key dropdown. Tip Don't choose Product_Category for the primary key because its cardinality is 3 (Men, Women, Kids) which is fewer than the total number of records in the data set. The Product_Category doesn't uniquely identify a record.
Can we create composite foreign keys?
You can create a composite foreign key just as you would create a single foreign key, except that instead of specifying just one column, you provide the name of two or more columns, separated by a comma.
How do you add and drop a foreign key?
You can drop a foreign key constraint using the following ALTER TABLE syntax: ALTER TABLE tbl_name DROP FOREIGN KEY fk_symbol; If the FOREIGN KEY clause defined a CONSTRAINT name when you created the constraint, you can refer to that name to drop the foreign key constraint.
What is purpose of foreign key?
A foreign key (FK) is a column or combination of columns that is used to establish and enforce a link between the data in two tables to control the data that can be stored in the foreign key table.
What is primary key and foreign key?
A primary key is used to assure the value in the particular column is unique. The foreign key provides the link between the two tables.
What is Salesforce CDP?
Salesforce CDP is a self-service customer data platform, or CDP, that drives personalization and engagement. Using a series of solutions, you can achieve a single, actionable view of your customer built on the world's #1 customer platform. Your Guide to Salesforce CDP.
What DB is used in Salesforce?
OracleSalesforce uses Oracle to power its databases.
Can foreign key have multiple columns?
MySQL allows us to add a FOREIGN KEY constraint on multiple columns in a table. The condition is that each Foreign Key in the child table must refer to the different parent table.
Can foreign key be primary key?
It is perfectly fine to use a foreign key as the primary key if the table is connected by a one-to-one relationship, not a one-to-many relationship. If you want the same user record to have the possibility of having more than 1 related profile record, go with a separate primary key, otherwise stick with what you have.
Can a table have 2 primary key?
Each table can only have one primary key. Access can automatically create a primary key field for you when you create a table, or you can specify the fields that you want to use as the primary key.