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In Apex, you can write SOQL (Salesforce Object Query Language) queries to retrieve data from Salesforce objects.
Here's a basic
example of how to write SOQL in Apex:
```apex
List<Account>
accounts = [SELECT Id, Name FROM Account];
```
In this example:
-
`List<Account>` defines the variable type as a list of Account objects.
You can replace `Account` with any Salesforce object you want to query. - Salesforce
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-
`[SELECT Id, Name FROM Account]` is the SOQL query enclosed in square brackets. Inside the query, you
specify the fields you want to retrieve (`Id` and `Name` in this case) from the
`Account` object.
Here's another
example where you filter the results based on certain conditions:
```apex
List<Contact>
contacts = [SELECT Id, FirstName, LastName FROM Contact WHERE AccountId =
:someAccountId];
```
In this example:
-
`WHERE AccountId = :someAccountId` is the filter condition that restricts the
results to only those contacts where the `AccountId` field matches the value
stored in the variable `someAccountId`.
You can
also use SOQL queries to retrieve related objects by using relationship fields.
For example:
```apex
List<Contact>
contactsWithAccounts = [SELECT Id, FirstName, LastName, Account.Name FROM
Contact WHERE AccountId != null];
```
In this example:
- `Account.Name`
is a relationship field that allows you to retrieve the `Name` field from the related `Account` object for each `Contact`.
Remember
to handle query results appropriately, considering bulkification and governor
limits in Salesforce. Additionally, you can use dynamic SOQL queries using the
`Database.query()` method if you need to construct your queries dynamically at
runtime. - Salesforce
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