So you wanted to have 1-to-1 relationship between Account & Contact.?

Just think a bit more, it can be achieved using wf field update.

Have you tried using external object with Salesforce Connect: Cross-org as the type of external data source.

WHY DO YOU WANT TO USE TRIGGER IF YOU CAN ACHIEVE THIS USING A WORKFLOW FIELD UPDATE ON A TEXT FIELD.

Any specific reason.

One way could be: Go to that class --> Select "Show Dependencies" button,

You can use Grant access using role hierarchies if the users are up in the same hierarchy.

For cross hierarchy, you can use different options like Sharing Rules(Criteria & Owner based), Manual Sharing and Apex Sharing as well.

For more info, refer salesforce guide.

I am not going to duplicate the explanation if it is already existing somewhere.

Bringing it at your click here:   Clone Explained

Let me know if you wanted to know any specifics which are not explained in this blog post.

Formula field value cannot be changed directly, they are read only. However, the value of formula fields can be changed by changing the values of the fields referenced in the formula fields.

Autonumber is a system-generated sequence number that uses a display format you define. The number is automatically incremented for each new record.

The Starting Number defines the starting point of the number in the format for the subsequently created records.

This point can help you understand this:

In a SOQL query with parent-child relationship subqueries, each parent-child relationship counts as an extra query. These types of queries have a limit of three times the number for top-level queries. The row counts from these relationship queries contribute to the row counts of the overall… Read more

Look at the example in the Aman's response above.

I think you can do a little bit of searching inside Salesforce Apex Developer Guide to get this answer.

Each execution of a batch Apex job is considered a discrete transaction. For example, a batch Apex job that contains 1,000 records and is executed without the optional scope parameter is considered five transactions of 200 records… Read more

At least mention the apex code you are using.

From error message, it says that the body is required in your httprequest.

Set the body and try again.

Query like:

select Id, Body, isRichText, Title, Type from CaseFeed where ParentId = '50090000008cXoS'

where

If Type = ContentPost, then it is an attachment. Then check for ContentType of the file

if(contenttype =='image/jpeg' || contenttype=='image/png' || contenttype=='image/gif' || contenttype=='image/jpg' ){ ... }

If isRichText =… Read more