Hello Muhammad,

I go through your code and find errors on implementation of the batch class:-

You are querying two objects in Database.query() which not possible in salesforce.

Solution -You can create an internal query if your Lead object and Opportunity object are related. (use carefully)

Thanks.

Hello,

SalesforceIQ is based on Relate IQ, software described as a relationship intelligence platform, which Salesforce acquired in 2014. SalesforceIQ for Small Business lacks the complexity and customization options of the company's higher-end offering but provides an affordable and easily-deployed solution for small and medium-sized… Read more

Hello,

JSON supports Objects, Arrays, Primitives (strings, numbers, boolean values (true/false), null) data types.
Thanks.

Hello,

If you use the External Data API: 40 GB. Maximum file size per external data upload If you use the user interface: 512 MB

Thanks.

Hello,

Cloud infrastructure services, known as Infrastructure as a Service (IaaS), are self-service models for accessing, monitoring, and managing remote datacenter infrastructures, such as compute (virtualized or bare metal), storage, networking, and networking services (e.g. firewalls). Instead of having to purchase hardware outright, users… Read more

Hello,

A block represents a high-level component (e.g. .car)
An element represents a descendant of a component (e.g. .car__door)
A modifier represents a particular state or variant of a block or element (e.g. .car__door_red)

Thanks.

hi,

Limitations

Information about an org’s Salesforce edition isn’t visible in Lightning Experience.
Langauages that are read from right to left,including Arabic are not supported in it.
Advanced currency management, or dated exchange rates, isn’t supported in general. But opportunities display the correct amount if the Close Date field is on… Read more

Hello shradha,

Types of custom events:-

Component-Level Events
Component-level events are generated by a component and can be handled by the component itself, or its containing component or application.

<!–c:ceEvent–>
<aura:event type=”COMPONENT”>
<aura:attribute name=”message” type=”String”/>
</aura:event>

Application-Level… Read more

hi,

You can use SOAP API  when you need to create, retrieve, update, or delete records. You can also use SOAP API to perform searches and much more.

hi,

External ID in salesforce is unique identifier for data used from outside world.Using an auto-number field avoids case-sensitive ID values that might otherwise confuse systems not designed to handle such ID values, like Excel (which is, by default, case sensitive).

hi,

Question-to-Case Overview: Question-to-Case lets moderators create cases from questions in Chatter, which makes it easier to track and resolve your customers’ issues. Question-to-Case is available in the full Salesforce site and Salesforce mobile web, as well as in communities where Chatter Questions is enabled.Chatter Questions lets… Read more

hi,

render

render : function(component, helper) {
var ret = this.superRender();
// custom rendering logic here
return ret;}

rerender

rerender : function(component, helper){
this.superRerender();
// custom rerendering logic here
}

The basic rule configuration is the same, but for time-based rules, you configure time-triggers in the time-dependent actions section. Each time trigger can execute one or more Workflow actions.

Hello,

The “View All” and “Modify All” permissions ignore sharing rules and settings, allowing administrators to grant access to records associated with a given object across the organization. “View All” and “Modify All” can be better alternatives to the “View All Data” and “Modify All Data” permissions.
Thanks.

Hello,

Let see an scenario,

For example, implementing the Schedulable interface guarantees that System.schedule knows how to run the code inside of the class, while implementing Comparable allows List.sort to know how to sort a collection of that object. This allows a given method to know how to interact with objects that may well be… Read more

Hello,

Salesforce Shield is a set of point and click tools that provides extra level of security to meet internal and regulatory compliance. This includes Platform Encryption, Event Monitoring and Field Audit Trail, outlined below.

Thanks.

Hello,

When using custom controller you may or may not create constructor as a default constructor is always present when you ceate any class.
Thanks.

Hello,

You can call a batch from a trigger, but you need to be aware of potential limits you could hit. You can only have 5 batch jobs queued or executing at once. If your trigger calls batch jobs each time, then you could quickly exceed that limit.

Thanks.

Hello,

You can create simple js method

<script type="text/javascript">
function sendEmail() {
// put code here
}
</script>

and add to command button onclick event

onclick="sendEmail()"

And why you want implement requirement without controller?