//This trigger will fire whenever account created or updated
Trigger SalespartnerUpdate on Job__c(after insert, After Update){

//accwithspmap variable is used to store the Account record id & SalesPartner__c record id
Map<id, id> accwithspmap = new map<id,id>();

//for loop is used to iterating Job__c records using trigger.New(job object fields will be available in this variable) context variable.
for(job__c j:trigger.New){
//checking current Job__c record having account & SalesPartner__c field values or not. 
//if the values are not emapty the below condition will execute
if(j.Account__c!=Null && j.SalesPartner__c!=Null){
//for each job record Account__c & SalesPartner__c field values are storing in map variable called accwithspmap by using Put method
accwithspmap.put(j.Account__c,j.SalesPartner__c);
}
}
//Initialized acclistupdate list variable to update the accounts with SalesPartner__c values
List<Account> acclistupdate = new List<Account>();
//getting the accounts which are linked to job__c records based on  accwithspmap.keyset()(this method have list of account keys) and iterating them using for loop
for(Account acclist: [Select id,SalesPartner__c from account where id=:accwithspmap.keyset()]){
//checking the accwithspmap variable contains the matching account or not. 
If(accwithspmap.containskey(acclist.id)){
//If its matching then we are assigning the job related SalesPartner__c field value to account SalesPartner__c field.
acclist.SalesPartner__c = accwithspmap.get(acclist.id);
// adding acclist variable values to acclistupdate list variable
acclistupdate.add(acclist);
}

}
//finally udating the account records with SalesPartner__c field valuue.
Update acclistupdate;



}