Data types in Apex Programming

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Data types in Apex programming:-

1. Auto Number: 
A system-generated sequence number that uses a display format you define. The number is automatically incremented for each record.

2. Formula: 
A read-only field that derives its value from a formula expression you define. The formula field is updated when any of the source fields change.

3. Roll-Up Summary:
A read-only field that displays the sum, minimum or maximum value of a related list.   

4. Lookup Relationship: 
Create a relationship that links this object to another object. The relationship allows users to click on a lookup icon to select a value from a popup list.

5. Master-Detail Relationship:
Create a special type of parent-child relationship between this object(the child or "detail") and another object(the parent or "master").

6. External Lookup Relationship: 
Create a relationship that links this object to an external object whose data is stored outside the Salesforce Org.

7. Checkbox: 
Allows users to select a True(checked) or False(unchecked) value.

8. Currency: 
Allows users to enter a dollar or other currency amount and automatically formats the field as a currency amount.

9. Date: 
Allows users to enter a date or pick a date from a popup calendar.

10. Date/Time: 
Allows users to enter a date and time, or pick a date from a popup calendar.

11. Email: 
Allows users to enter an email address, which is validated to ensure proper format. If this field is specified for a contact or lead, users can choose the address when clicking Send an Email.

12. Geolocation: 
Allows users to define locations. Includes latitude and longitude components, and can be used to calculate distance.

13. Number:
Allows users to enter any number. Leading zeros are removed.

14. Percent: 
Allows to user to enter a percentage number.

15. Phone: 
Allows users to enter any phone number. Automatically formats it as a phone number.

16. Picklist: 
Allows users to select a value from a list you define.

17. Picklist(Multi-Select): 
Allows users to select multiple values from a list you define.

18. Text: 
Allows users to enter any combination of letters and numbers.

19. Text Area:
Allows users to enter up to 255 characters on separate lines.

20. Text Area(Long): 
Allows users to enter up to 131,072 characters on separate lines.

21. Text Area(Rich): 
Allows users to enter formatted text, add images and links. Up to 131,072 characters on separate lines.

22. Text(Encrypted): 
Allows users to enter any combination of letters and numbers and store them in encrypted form.

23. URL: 
Allows users to enter any valid website address. When users click on the field, the URL will open in a separate browser window.


How to create a field in Contact object:-

  1. Login to your Salesforce account.
  2. Go to setup.
  3. Search for Contacts in Quick Find/Search box then clicks on Fields.


  4. Then clicks on the New button.



  5. Select any one data type and then clicks on the Next button.



  6. Enter a name of the field and then clicks on the Next button.

   


  7. Select Field-level security according to your needs and then clicks on the Next button.



  8. Select the Page Layouts to include this field and then clicks on Save button.


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