A quick and short Salesforce reference guide

Lead Conversion and validation rules  Enable 'Require Validation for Converted Leads' in Salesforce Classic Go to  Setup | Build | Customize | Leads | Lead Settings. Click on  Edit . Select  Require Validation for Converted Leads . Click on  Save . Enable 'Require Validation for Converted Leads' in Lightning Experience Click on gear icon then  Setup . On the Home Tab, look for  Feature Settings  |  Marketing  |  Lead Settings . Click on  Edit . Select  Require Validation for Converted Leads . Click on  Save . https://help.salesforce.com/articleView?id=000334707&type=1&mode=1 https://help.salesforce.com/articleView?id=000331020&language=en_US&type=1&mode=1 https://success.salesforce.com/answers?id=9063A000000E3d6

https://developer.salesforce.com/docs/atlas.en-us.soql_sosl.meta/soql_sosl/sforce_api_calls_soql_select_agg_functions.htm Select distinct Records, example products with duplicate Product codes SELECT ProductCode, COUNT(Id) FROM Product2 GROUP BY ProductCode HAVING COUNT(Id) > 1

***** Field Validations and ERROR message public PageReference save() { PageReference result=null; Contact cont=(Contact) stdCtrl.getRecord(); if ( (String.IsBlank(cont.Email)) && (String.IsBlank(cont.Phone)) ) { cont.email.addError ('Please enter an email address or phone number'); cont.phone.addError ('Please enter a phone number or email address'); } else { result=stdCtrl.save(); } return result; }