Table of Contents
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Blog Summary
- Learn about the frequently asked SOQL interview questions to ace your Salesforce developer interviews.
- Gain insights into SOQL query best practices, governor limits, relationship queries, and aggregate functions.
- Enhance your understanding of Salesforce Apex and SOQL to improve your problem-solving skills.
SOQL interview questions are among the most frequently asked topics in any Salesforce developer interview. SOQL is the query language for the platform that allows Salesforce developers, custom UI builders, and users to retrieve and search data from the Salesforce database. You can query Salesforce objects like Accounts, Contacts, and Opportunities in SOQL.
This blog features a list of top SOQL interview questions to help you prepare for your next Salesforce developer interview. These questions will help you learn SOQL and how to answer them in depth.
Top 20 SOQL Interview Questions
These are some of the best SOQL query interview questions that can help you prepare for your interview confidently. We have also included some scenario-based questions to provide you with more clarity.
1. What is SOQL in Salesforce?
SOQL (Salesforce Object Query Language) retrieves data from Salesforce objects, similar to SQL in relational databases. It helps query specific fields from one or more objects based on certain conditions.
2. Can SOQL query multiple objects?
SOQL does not allow traditional joins, but you can query parent-to-child and child to parent relationships through relationship queries.
3. What’s the difference between SOQL and SOSL? In which scenario would you use one over the other?
SOQL and SOSL are two Salesforce query languages that do different things.
SOQL is an object-based query language to query data on one or a specific related set of objects. It is used when you know where a piece of data resides and can build a specific query for that object.
SOSL, on the other hand, is a text-based query language where you find general text in multiple objects. It is beneficial in scenarios where the data location is unknown and where your exact data would lie among your organization’s multiple objects. It depends on the requirement.
Read More:
SOQL vs SOSL
4. What is the syntax of a SOQL query?
The basic SOQL syntax is:
SELECT field1, field2 FROM ObjectName WHERE conditions
Example:
SELECT Name, Industry FROM Account WHERE Industry = ‘Technology’
5. How to run a SOQL query in Salesforce?
We can run SOQL queries using the following:
- Developer Console under the “Query Editor” tab
- Third Party Tools (like Workbench)
- VS Code with SOQL Builder
- Apex code using the Database.query() method
6. What is the difference between SOQL and SQL?
SOQL retrieves data only from Salesforce objects and doesn’t support joins beyond parent-child relationships. Conversely, SQL is used in relational databases and supports complex joins between multiple tables.
7. What are Salesforce’s SOQL limits, and how can you bypass them?
Salesforce’s SOQL has a governor limit of 50,000 records per transaction. It even pauses the retrieval of new records to avoid overuse of shared resources.
Apart from this, there are 100k-character limits for queries and 400k-character limits for strings.
These limitations can be readily overcome by using pagination with OFFSET and LIMIT clauses, which fetch data in larger chunks. Another option is Batch Apex, which processes large datasets asynchronously by splitting them into smaller batches. Also, use selective filters to optimize your SOQL searches and process less data.
8. What are essential clauses used in SOQL?
- WHERE – To filter records using different operators.
- SELECT – To define fields and relationship queries.
- FROM – To target Salesforce objects.
- LIMIT – To restrict the number of results.
- ORDER BY – To sort results and dictate null behaviours.
- GROUP BY – To group records based on a field.
- HAVING – To filter results given by “GROUP BY”.
9. Write a SOQL query to retrieve the top 5 Accounts with the highest Annual Revenue, ordered in descending order.
SELECT Name, AnnualRevenue
FROM Account
ORDER BY AnnualRevenue DESC
LIMIT 5
10. How do you run batch queries in SOQL?
When dealing with large data sets, batch processing is recommended. Apex Batch classes efficiently process large SOQL query results without hitting governor limits.
11. What are Governor Limits in Salesforce, and how do they affect SOQL?
Governor limits the enforcement of resource efficiency in Salesforce. Key SOQL limits include:
- A maximum of 50,000 records can be returned.
- 100 SOQL queries for synchronous and 200 for asynchronous per transaction.
12. How do you query child records related to a parent using SOQL?
In SOQL, a relationship between parent and child in a query can be fetched using a subquery or dot notation. For example, I can use the following to get the list of contacts associated with accounts:
SELECT Name, (SELECT LastName FROM Contacts) FROM Account
The child relationship (Contacts) is queried in the parent Account in the above query.
13. How would you count records using SOQL?
To count records in SOQL, I would use the COUNT() function. Example:
SELECT COUNT() FROM Account WHERE Industry = ‘Technology’
This will fetch all the accounts where the industry is ‘Technology.’
14. How can you optimize SOQL queries?
- Use WHERE clauses to filter records.
- Select only the necessary fields.
- Use indexed fields in WHERE clauses to improve performance.
- Apply the LIMIT clause to reduce the number of returned records.
15. What are aggregate functions supported by SOQL?
SOQL supports the following aggregate functions:
- COUNT()
- SUM()
- AVG()
- MAX() and MIN()
SOQL Scenario Based Interview Questions
16. How do you fetch all contacts where the parent account belongs to the “Technology” industry?
SELECT FirstName, LastName FROM Contact WHERE Account.Industry = ‘Technology’
17. How do you get the top 10 recently created Opportunities?
SELECT Name FROM Opportunity ORDER BY CreatedDate DESC LIMIT 10
18. How to query deleted records in Salesforce?
Use the ALL ROWS keyword to include deleted records:
SELECT Name FROM Account WHERE IsDeleted = TRUE ALL ROWS
19. What is a subquery in SOQL, and when is it used?
A subquery is used for parent-child relationship queries:
SELECT Name, (SELECT Subject FROM Tasks) FROM Account
20. How do you use variables in SOQL within Apex code?
SOQL allows the use of variables when embedded in Apex.
apex
String industry = ‘Technology’;
List<Account> accounts = [SELECT Name FROM Account WHERE Industry = :industry];
Final Word
These SOQL interview questions cover all the basic concepts, from simple query answers for freshers to advanced SOQL syntax for experienced professionals. Whether it is a relationship query, an aggregate function, or a large chunk of data, mastering SOQL is essential for making work more efficient in the world of Salesforce.
In addition, practicing scenario-based SOQL interview questions will make you more confident in handling real-world scenarios. Writing clean, practical SOQL queries is essential in any interview and a boon for day-to-day tasks in Salesforce development and administration.
Shrey Sharma is the Founder of S2 Labs and a 2019 Salesforce MVP. He's trained 50,000+ students into Salesforce careers and runs Salesforce Hulk, the largest Salesforce-focused YouTube community. He's been a featured speaker at Salesforce community events worldwide, and his mission with S2 Labs remains simple: real mentorship, hands-on projects, and a clear path from classroom to career.
