How to Write SOQL in Apex? | Salesforce Developer

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 CRM Online Training

- `[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 Online Training

 

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