In salesforce one cannot define composite keys as one can define in oracle or MsSQL but you can provide "Unique and Required" attribute to one column and required attrinute on other columns and then write triggers or validation rule to make them behave as a composite key.
Full Answer
How to create validation rules in Salesforce?
Steps to create validation rules. Go to detailed view of the object. Go to validation section. Click on new (provide your rule name). Enter rule name and in the formula editor provide formula as (S1__c>100,S2__c>100,S3__c>100). Provide error message and give Error location as Top page or Field.
How to create a single Validation rule for every subject?
Click on new (provide your rule name). Enter rule name and in the formula editor provide formula as (S1__c>100,S2__c>100,S3__c>100). Provide error message and give Error location as Top page or Field. Instead of writing validation rules for every subject we can give single validation rule as OR (S1__c>100,S2__c>100,S3__c>100).
What are the validation rules for custom date fields?
Validates that a custom date field contains a date within the current year. Date must be in the current year. In the example, the validation rule determines if the difference between two values (Salary Max and Salary Min) is greater than $20,000.
What are the elements of a Validation rule?
List the elements of a validation rule. Create a validation rule. Validation rules verify that data entered by users in records meets the standards you specify before they can save it. A validation rule can contain a formula or expression that evaluates the data in one or more fields and returns a value of “True” or “False.”
How do I create a composite key in Salesforce?
When you need a custom Primary Key, Salesforce CDP can create a composite key that combines field columns. If multiple field columns represent a unique record, Salesforce CDP lets you write a formula to generate a composite key. The formula concatenating multiple source fields can serve as the primary key.
How do you make a unique field combination in Salesforce?
All you have to do is create a new "Matching Rule" on your desired object (Standard or Custom), activate it, and then create a new "Duplicate Rule" and have it use the "Matching Rule" you just created/activated. Easy peasy!
How do I find unique fields in Salesforce?
Go to Setup-Customize-Accounts and click on fields. Scroll down to the Account Custom Fields and Relationships. The Data Type column of the table will have (Unique) or (External Id) mentioned next to the fields. Hope this helps.
What is primary key in Salesforce?
The Primary Key lets Salesforce CDP identify uniquely a record. As records are loaded into the data source object (DSO), it can either update or create a record. Because the primary key is the basis for inserting versus updating, you must define the primary key correctly. SKU is the primary key in this product catalog.
How do you prevent duplicate records in Salesforce using validation rule?
The most common way to prevent record creation or updates in Salesforce is through a validation rule. But can a validation rule prevent duplicates? The short answer: no. A standard validation rule can only use specific record data, so it can't find potential duplicate records.
How do you prevent duplicates in Salesforce?
Block sales reps from creating duplicate leads. In the Standard Lead Duplicate Rule, select Block instead of Allow. With the Standard Lead Duplicate Rule set to block duplicates, a rep can click to view duplicates of leads but can't save a new lead.
How do I select unique values in SOQL?
SELECT count(Id), Name FROM Participant__c GROUP BY Name To access the unique names in Apex, you could do something like this or simply use sets.
What types of fields can be marked as unique in Salesforce?
Salesforce allows us mark only custom fields with data type text, number or email as External IDs.
What is the use of unique field in Salesforce?
The 'Unique ID' field is a setting which prevents the same value from being used in multiple records for any specific field. External IDs are often created with the 'Unique ID' setting so that the External IDs will be unique to each record.
What is difference between primary key and subscriber key?
You can have more than 1 primary key, and it uniquely identifies a row in a data extension. It also ensures records are not overwritten when you create an import activity. Subscriber Key – Contains a value that uniquely identifies a subscriber in your system.
What is the difference between subscriber key and contact key?
Contact key, also known as subscriber key, is the unique identifier used to aggregate a contact's devices within Marketing Cloud. Set the contact key to a specific value provided by your customer or to another unique identifier for the contact.
What is the difference between subscriber key and subscriber ID?
Subscriber ID is a system defined unique identifier representing a Subscriber. Subscriber Key is a user defined unique identifier representing a Subscriber. just to add on, Subscriber Key is usually, by default, the email address of the subscriber.
When Should I Use Validation Rules?
Use Validation Rules to maintain user input data, or system modified records.
Sales Cloud Validation Rules
Sales reps aren’t the greatest fans of data input. To keep your Salesforce data quality on track, use Validation Rules to guide users while working with Sales Cloud objects.
Service Cloud Validation Rules
Service agents have enough to juggle while assisting customers on the phone, email, chat, or the many other channels they are expected to monitor.
Top Tips for Working with Salesforce Validation Rules
Ideally, admins should prepare/design automation/integrate systems respecting active Validation Rules. However, having a way to toggle which users should bypass Validation Rules is very useful.
Summary
This guide has covered when to use Validation Rules, how to create them, and 14 Validation Rule examples that are ready for you to implement in your org.
What is validation rule?
A validation rule can contain a formula or expression that evaluates the data in one or more fields and returns a value of “True” or “False.”. When the validation rule returns a value of "True", this confirms that the data entered by the user contains an invalid value. Validation rules can also include error messages to display to users ...
What does "true" mean in validation?
In the example, the validation rule determines if the difference between two values (Salary Max and Salary Min) is greater than $20,000. A value of "True" indicates that the data entered by the user contains an invalid value. That is, if the user enters two values whose difference exceeds the $20,000 salary range, the validation rule returns a response of "True" and sends an error message.