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Currently there's no inbuilt option to connect directly to your database with Salesforce. However, using an integration service (or web-service, REST API, etc.), you can connect or sync to an external database.

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A data extension is a table that contains your data. Push any tracking data for emails sent to SFDE audiences using Marketing Cloud Salesforce Sends to the Salesforce Contact or Lead record in the connected org.

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Please refer the following link-
https://help.salesforce.com/articleView?id=mc_es_create_data_extension_classic.htm&type=5

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External ID are used when we interacting with a external systems. It will act as unique identifier. We can define 3 external ID fields per object. These are the data types of fields.

• Number.
• Text.
• Email.

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By Profiles we can hide a tab from a user.
Use “Tab Hidden” setting for Tab Hide.

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We have a attribute called action in the <apex:commnadbutton> tag in the VF page.
<apex:commandButton action=”{!save}” value=”Save” id=”theButton”/>.

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The following are the Data Components in the Dashboards.

1. Horizontal Bar Chart.
2. Vertical bar Chart.
3. Line Chart.
4. Pie Chart.
5. Donut Chart.
6. Funnel Chart.
7. Gauge Chart.
8. Metric.
9. Table.

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Any number of records.

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Model View Controller (MVC) design pattern is the one of the most popular design pattern which contains three modules.

1. Model.
2. View.
3. Controller.

• Model: What Schema and Data does salesforce uses to represent the system completely. In Salesforce, we can say that sObject are the model.
  • Example: Sobjects, Apex Classes.
• View: How the Schema and data is represented. Visualforce is used to present the data to users.
  • Example: Pages, Components.
• Controller: How the interface actions. Controllers are used to perform the actions whenever users interact with Visualforce.
  • Example: Standard, Custom(Apex).

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• Bulkify your code: Bulkifying Apex code refers to the concept of making sure the code properly handles more than one record at a time. When we try to load the link of the records using the Data Loaders, then we make sure that code will satisfy.
• Avoid SOQL Queries inside For loops: When queries are placed inside a for loop, a query is executed on each interaction and the governor limit is easily reached. Instead move the SOQL query outside of the for loop and retrieve all the necessary data in a single query.
• Avoid Multiple Triggers on the Same Object: Write the Single Trigger on the each object and write the logic in the classes and call that classes in the triggers.
• use of the Limits Apex Methods to avoid Hitting Governor Limits.
• Avoid hardcoding IDs.

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There are three ways to do deployment.

1. By using change Sets.
2. By using Force.com IDE tool(Eclipse).
3. By using Force.com Migration toolkit.

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Click on the Tab and go to Tools section, we can find the Merge option.

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Use the WITH SECURITY_ENFORCED clause to enable field- and object-level security permissions checking for SOQL SELECT queries in Apex code, including subqueries and cross-object relationships.

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View All and Modify All permissions.

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Force.com is the platform used to develop the applications in the salesforce. Salesforce.com is keyword used to search anything.

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First we have to create the lookup relationship. Next update the existing records with some value in the lookup field. Now change the data type from lookup to master-detail.

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Yes, we can change the Lookup relationship to master-detail relationships.

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The Order of execution gives the what are the events that Salesforce performs in order.

• Executes all before triggers.
• System validations are performed.
• Custom validations are performed.
• Saves the record but doesn’t commit.
• Executes the assignment rules.
• Executes the Workflow rules.
• Commit to th database.

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The maximum response size when creating a PDF must be below 15 MB, before being rendered as a PDF.

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• Insert.
• Update.
• Upsert.
• Delete.
• Export.

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Both determines if an expression has a value and returns TRUE if it does not. If it contains a value. this function returns FALSE.

• ISBLANK(expression) : The expression allows both number and text fields
• ISNULL(expression): Here the expression allows only number fields.

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• <apex:actionFunction>: A component that provides support for invoking controller action methods from Javascript code using an Ajax request.
  • An <apex:actionFunction> component must be child of an component.
• <apex:actionStatus>: This Component i s used for displaying different values depending on whether it’s in progress or completed.
• <apex:actionsupport>: A component that adds AJAX support to another component, allowing the component to be refreshed asynchronously by the server when a particular event occurs, such as a button click or mouseover.
• <apex:actionPoller>: This component specifies a timer that sends an Ajax update request to Force.com according to a time interval that we specify.

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If you need a greater limit and you don't want to purchase extra user licenses or upgrade your Salesforce Edition, you can purchase extra API calls at Checkout or by contacting your account representative.

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The report shows the same dataset as before, but without the misleading fields.

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Starting with almost all the fields selected