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Creating a Validation Rule From Setup, go to Object Manager and click Account. In the left sidebar, click Validation Rules. Click New. Enter the following properties for your validation rule:Error Message: Account number must be 8 characters long. To check your formula for errors, click Check Syntax.

Validation rules verify that the data a user enters in a record meets the standards you specify before the user can save the record. 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.

Create validation rule in Salesforce Classic Click Setup. Click Customize the object you need to modify Validation Rules. Click New. Enter the Validation Rule name. Set the Validation Formula as per the suggestion above, feel free to adapt to your needs. Set the error message that the User will receive.

There are four ways to make a field mandatory: You can set a field as REQUIRED via the Page Layout. You can set a field as REQUIRED using a Validation Rules (field will become mandatory based on specific criteria) You can also use the Field Level Security at the profile level to define access to a field. Via Triggers.

A validation rule is one way to restrict input in a table field or a control (such as a text box) on a form. Validation text lets you provide a message to help users who input data that is not valid.

Best Practice to Follow while writing trigger One Trigger Per Object.Logic-less Triggers.Context-Specific Handler Methods.Bulkify your Code.Avoid using DML statements and SOQL Queries inside FOR Loops.Using Collections, Streamlining Queries, and Efficient For Loops.Querying Large Data Sets.

This is how you can make any field required based on selection of a picklist field value....We have different ways to make a field required: Required Checkbox while field creation. Page Layout. Validation Rule. Using custom code (Visualforce Page, Lightning component, Apex Trigger to say a few)

Review examples of validation rules for various types of apps that you can use and modify for your own purposes. Validation rules verify that the data a user enters in a record meets the standards you specify before the user can save the record.

Make a Standard field 'Required' by using Page Layout in Lightning Experience User Interface: Click Setup. Click Object and fields. Select Object Manager. Select Object. Click Page layout. Edit 'Layout' and make the field to Required.

There are 3 ways to make custom fields required.... Click on the gear icon then Setup > Object Manager. Choose the object > Fields & Relationships. Select the custom field that you will make required. Click on Edit and under General Options select Required. Click on Save.