Kaizen 185 - Subqueries in COQL API

Hello everyone!!

Welcome to another Kaizen week, where we discuss developer centric topics every Friday. This week, we have picked an interesting topic to discuss - Subqueries in COQL API.

Zoho CRM's CRM Object Query Language (COQL) is a powerful way to retrieve data from your CRM in a structured manner. With the release of COQL API version 7, we introduced a suite of enhancements, detailed in our previous Kaizen post. Today, we will cover one enhancement in detail—Subqueries.

Before the introduction of subqueries, filtering data dynamically across related modules required multiple API calls and additional code handling. Subqueries have fundamentally changed this, offering increased flexibility, reduced API consumption, and improved query performance. In today's Kaizen, we will explore what subqueries are, where and when to use them, their advantages, and a few practical use cases. We will also go through a few examples with different operators to help you understand COQL subqueries better.

What are Subqueries?

At its core, a subquery is a query nested within another query. This technique allows you to retrieve data from one module based on conditions derived from another related module. Think of it as a way to ask more sophisticated, multi-layered questions of your CRM data.

Imagine you're working on a CRM integration and need to find all Contacts associated with Accounts that have at least one Deal created in the last 30 days.

Before Subqueries:

Before subqueries, achieving this required multiple steps:

1. Retrieve Account IDs from the Deals module where a Deal was created in the last 30 days - {"select_query": "SELECT Account_Name, Created_Time FROM Deals WHERE Created_Time >= '2025-01-01T00:00:00+05:30'"}
2. Use these Account IDs in a second query to fetch associated Contacts - {"select_query": "SELECT Full_Name, Email FROM Contacts WHERE Account_Name in ('4876876000007481116', '4876876000007420031')"}
   

This requires writing extra code to store and use the Account IDs from the first query in the second query. This also means making multiple API calls, and handling responses separately. However, with Subqueries in COQL, this can now be achieved in a single query.

Using Subqueries:

With subqueries, you can achieve the same result in one single query!

{

  "select_query": "SELECT Full_Name, Email FROM Contacts WHERE Account_Name in (SELECT Account_Name FROM Deals WHERE Created_Time >= '2025-01-01T00:00:00+05:30')"

}

The Subquery (SELECT Account_Name FROM Deals WHERE Created_Time >= ...) retrieves Account IDs where a Deal was created in the last 30 days. The main query (SELECT Full_Name, Email FROM Contacts WHERE Account_Name IN (...)) fetches Contacts linked to those Accounts, all in one API call!

But there is a catch. Subqueries return only up to 100 records per query. If more than 100 matching records exist (e.g., over 100 Accounts with recent Deals in this case), the extra records are silently ignored. This can lead to incomplete results, so subqueries are best used when the filtered dataset is known to be small. Please head over to the Limitations section to learn about other limitations. 

Where to use Subqueries?

Subqueries in COQL are useful when there is a need to filter data dynamically based on conditions from other modules. Instead of fetching records separately and processing them, subqueries allow you to retrieve the required data in a single query.

Here are some common use cases where subqueries come in handy:

• Segment accounts based on high-value Deal history: For instance, you can use subqueries to fetch accounts that have at least one high-value closed Deal. 
  { "select_query": "SELECT Account_Name FROM Accounts WHERE id in (SELECT Account_Name FROM Deals WHERE Amount > 100000 AND Stage = 'Closed Won')"}
  
  
• Find Contacts whose Accounts have NEVER closed a deal: You can use subqueries in COQL to fetch Contacts that have no associated Deals. 
  {"select_query": "SELECT Full_Name, Email FROM Contacts WHERE Account_Name not in (SELECT Account_Name FROM Deals WHERE Stage != 'Closed Won')"}
  
  
• Identify new Leads who haven’t been marketed to yet: For instance, if need to find all leads who were NOT part of a specific campaign, you can use Subqueries in COQL.
  {"select_query": "SELECT Full_Name, Email FROM Leads WHERE id not in (SELECT Leads FROM Campaigns WHERE Campaign_Name = 'T01')"}
  where Leads is a lookup up field in the Campaigns module.
  
  
• Identify Deals Closed Outside a Specific Campaign: Similarly, to find all Deals that closed outside the “Q1 Marketing Blitz” campaign window, you can use the NOT BETWEEN operator with subqueries.
  { "select_query": "SELECT Deal_Name, Created_Time FROM Deals WHERE Closing_Date not between (SELECT Start_Date FROM Campaigns WHERE Campaign_Name = 'Q1 Marketing Blitz') and (SELECT End_Date FROM Campaigns WHERE Campaign_Name = 'Q1 Marketing Blitz')"}

Key Benefits of Using Subqueries

• Reduces API calls and Credit consumption – Instead of fetching related data in multiple queries, subqueries fetch it in one go.
• Less Data Processing – No need to store and process results from one query before making another.
• Improved Query Efficiency – Filters and retrieves only relevant records dynamically.
• Simplifies Integration Code – Removes extra loops and logic required to handle multiple queries.
  

Limitations of Subqueries in COQL

While subqueries improve performance and efficiency, they come with certain limitations:

• Subqueries can only be used in the WHERE clause. You cannot use subqueries in SELECT or FROM.
• There can be a maximum of 5 subqueries per query.
• Only one column can be selected in a subquery. You cannot fetch multiple fields from the subquery.
• Limited to 100 records per subquery. If more records are needed, or there could be more than 100 possible records in the subquery, consider using JOINs.
  

Credit Consumption Considerations

Please note that using subqueries does not introduce any change in credit consumption compared to regular COQL queries. Credit usage is determined by the number of records retrieved in the main query.

The following table outlines the credit consumption based on the number of records retrieved:

LIMIT (No: of records)	API credits consumed
1 - 200	1
201 - 1000	2
1001 - 2000	3

Subqueries vs. JOINs

A JOIN clause in COQL lets you retrieve fields from two (or more) related modules in a single query by linking them on a lookup field—no nested queries needed. It’s ideal when you need columns from both modules, ie., the parent module and the related modules, in the same response.

For example, consider a scenario where it's necessary to query all accounts that have associated Deal records created within the past month.

—without getting duplicate Account rows if an Account closed multiple Deals.

Subquery Approach:

{  "select_query": "SELECT Account_Name FROM Accounts WHERE id in (SELECT Account_Name FROM Deals WHERE Created_Time >= '2025-03-01T00:00:00+05:30')"}

The subquery first selects Account_Name from Deals where the Created_Time is within the past month. Then the main query fetches the Account_Name from Accounts, once per matching account.

JOINs Approach:

{ "select_query": "SELECT 'Account_Name.Account_Name', 'Account_Name.id' FROM Deals WHERE Created_Time >= '2025-03-01T00:00:00+05:30'"}

This JOIN COQL query queries the Deals module and pulls related fields from the Account_Name lookup (Account name and ID) for each Deal created in the last month. As a result, it returns duplicate rows for accounts that have multiple matching deals.

Sample Response:

Subquery

JOIN

{     "data": [         {             "Account_Name": "Chapmans",             "id": "4876876000004946070"         },         {             "Account_Name": "Customer Daily",             "id": "4876876000005030168"         },         {             "Account_Name": "Luma Infotech",             "id": "4876876000007420031"         },         {             "Account_Name": "Luma Biotech",             "id": "4876876000007481116"         }     ],     "info": {         "count": 4,         "more_records": false     } }

{     "data": [         {             "Account_Name.id": "4876876000007481116",             "Account_Name.Account_Name": "Luma Biotech",             "id": "4876876000010128001"         },         {             "Account_Name.id": "4876876000007481116",             "Account_Name.Account_Name": "Luma Biotech",             "id": "4876876000010128016"         },         {             "Account_Name.id": "4876876000007420031",             "Account_Name.Account_Name": "Luma Infotech",             "id": "4876876000010128047"         },         {             "Account_Name.id": "4876876000005030168",             "Account_Name.Account_Name": "Customer Daily",             "id": "4876876000010193006"         },         {             "Account_Name.id": "4876876000004946070",             "Account_Name.Account_Name": "Chapmans",             "id": "4876876000010213010"         }     ],     "info": {         "count": 5,         "more_records": false     } }

Why Subqueries Are Better in This Case:

• No Duplicates: Subqueries ensure that each matching parent (Account) appears only once, even if multiple child records (Deals) match. This is perfect for deduplicated reporting or dropdown lists.
• Cleaner Result: Easier to parse and use directly in UIs or aggregations where duplicates are not useful.
• Lower Payload Size: Especially useful if you just want the Account info and don’t need Deal-level detail.

Both subqueries and JOINs allow you to retrieve related data, but when should you use one over the other?

Use Subqueries When:

• You need to filter data based on related module conditions.
• You do not need to fetch fields from multiple modules. ie., you want to query the inner lookup fields only in the WHERE clause, and not in any other clause.
• You need deduplicated parent records.
• The subquery has 100 or less records.

Use JOINs When:

• You need to retrieve fields from multiple related modules in the same response. ie., you want to query the inner lookup fields in any clause other than the WHERE clause.
• You are dealing with large datasets exceeding the subquery limit of 100 records.
• You need detail per child record, even if it leads to duplicate parent values.
  

Operator support for Subqueries in COQL

When using subqueries in COQL, make sure to use the correct operators depending on whether the subquery returns multiple values or a single value.

Multi-Value Operators

These operators are to be used with the subqueries that return multiple values, which are then used in the main query. 

Operator	Description	Example use case and query
in	Checks if a value is present in a list of values returned by the subquery.	Fetch all Contacts whose Accounts have won high-value deals. {"select_query": "SELECT Full_Name, Email FROM Contacts WHERE Account_Name in (SELECT Account_Name FROM Deals WHERE Stage = 'Closed Won' AND Amount > 100000)"}
not in	Excludes records where the value is present in the subquery result.	Fetch all Contacts whose Accounts have never closed a deal. { "select_query": "SELECT Full_Name, Email FROM Contacts WHERE Account_Name not in (SELECT Account_Name FROM Deals WHERE Stage = 'Closed Won')"}

Single-Value Operators

These operators require the subquery to return a single value. If the subquery returns multiple values, an error will occur. 

Operator	Description	Example use case
=	Matches records where the field is equal to the subquery’s result.	Fetch Deals created on the same date as the latest deal.
!=	Retrieves records where the field is not equal to the subquery’s result.	Fetch Deals not created on the same date as the latest deal.
<, >, <=, >=	Compares a field with the single value returned by the subquery.	Fetch all Deals that closed before the latest high-value deal.
between	Ensures a field's value falls within a range.	Fetch all Deals closed between two specific deal closure dates.
not between	Excludes records within the range.	Fetch all Deals closed outside a specific date range.

Example 1: Using the IN operator to fetch Contacts linked to high-value Deals

{ "select_query": "SELECT Full_Name, Email FROM Contacts WHERE Account_Name in (SELECT Account_Name FROM Deals WHERE Amount > 100000 AND Stage = 'Closed Won')" }

Example 2: Using the NOT IN operator to fetch Contacts from Accounts that have never closed a Deal

{ "select_query": "SELECT Full_Name, Email FROM Contacts WHERE Account_Name not in (SELECT Account_Name FROM Deals WHERE Stage = 'Closed Won')"}

Example 3: Using the BETWEEN operator to identify Deals closed during a specific Campaign (Q1 Marketing Blitz)

{ "select_query": "SELECT Deal_Name, Created_Time FROM Deals WHERE Closing_Date between (SELECT Start_Date FROM Campaigns WHERE Campaign_Name = 'Q1 Marketing Blitz') and (SELECT End_Date FROM Campaigns WHERE Campaign_Name = 'Q1 Marketing Blitz')"}

Combine JOINs and Subqueries for Smarter Filtering

In many business scenarios, it is not enough to simply retrieve related fields via JOINs—you also need to dynamically filter data based on conditions from another module. This is where subqueries can be incredibly useful in conjunction with JOINs.

Let’s say you're analyzing deal performance and want to pull a list of Deals that are:

• Associated with Active Campaigns
• Linked to Accounts in high-revenue Industries (Annual Revenue > 10,000,000)
• You need to fetch details from the related modules—like Account name, Campaign name, and Contact email—in the same query
  

Why this can't be solved easily: While COQL supports JOINs for pulling data from related modules and subqueries for dynamic filtering, you can’t do all of this in one approach alone.

• JOINs allow you to retrieve fields from related modules (like Contact_Name.Email )—but they do not let you dynamically filter using fields from those modules.
  
• Subqueries, on the other hand, allow you to filter based on fields from related modules (like filtering Deals based on the Annual Revenue of the associated Account)—but you can’t fetch fields from multiple related modules using just a subquery.
  

So, if you need to both filter based on fields in a related module (like Accounts.Annual_Revenue) and retrieve fields from related modules (like Contact_Name.Email, Campaign_Source.Campaign_Name), you need both tools.

Solution: Combine JOINs and Subqueries in the Same Query

{"select_query": "SELECT Deal_Name, Amount, Account_Name, Campaign_Source, Contact_Name.Email FROM Deals WHERE (Campaign_Source.Status = 'Active') AND Account_Name.Industry in (SELECT Industry FROM Accounts WHERE Annual_Revenue > 10000000 GROUP BY Industry)"}

This query:

• Uses JOINs to fetch:
• Contact_Name.Email – from Contacts
• Uses a subquery to apply dynamic filtering on Deals based on the Industry of Accounts with Annual Revenue > 10000000. COQL subqueries return a maximum of 100 records. If multiple accounts satisfying the criteria share the same industry, using GROUP BY Industry ensures only unique industry values are returned. This helps stay within the 100-record limit and avoids redundant filtering.

In the results, you get a deduplicated, filter-accurate list of Deals tied to Active Campaigns and high-value industries—with rich contextual fields in one API call.

You can even use JOINs inside subqueries. For instance, to fetch all deals from Optical Networking accounts managed by Jane (jane.doe@zohotest.com), and include key details about the deal, contact, account, and campaign:

{ "select_query": "SELECT Deal_Name, Amount, Account_Name, Contact_Name.Email, Campaign_Source FROM Deals WHERE Account_Name in (SELECT id FROM Accounts WHERE Industry = 'Optical Networking' AND Owner.email = 'jane.doe@zohotest.com')"}

By combining JOINs and subqueries, you can handle more complex, real-world business requirements in a single query. JOINs help you enrich your data with fields from related modules, while subqueries let you apply smart, condition-based filters across modules. 

Advanced Filtering: Nested Subqueries

For more advanced use cases, you can nest subqueries within subqueries to create complex filtering conditions.

Let's say Imagine you need to identify all Contacts associated with Accounts that meet two specific criteria:

• The Account is in the "Retail" industry.
• The Account has at least one associated Deal that is in the "Closed Won" stage and has a value greater than $50,000.

This scenario is common in sales and marketing, where you want to target high-potential customers within a specific industry. Here's how you can achieve this using a nested subquery in COQL:

{

  "select_query": "SELECT Full_Name, Email FROM Contacts WHERE Account_Name in (SELECT id FROM Accounts WHERE Industry = 'Communications' AND id in (SELECT Account_Name FROM Deals WHERE Stage = 'Closed Won' AND Amount > 50000))"

}

Innermost Subquery: (SELECT Account_Name FROM Deals WHERE Stage = 'Closed Won' AND Amount > 50000)

This subquery identifies all Account_Name values from the Deals module where the Stage is "Closed Won" and the Amount is greater than $50,000. Although the field name is Account_Name, it's a lookup to the Accounts module, so it returns the Account ID. This effectively isolates Accounts that have closed high-value deals.

Middle Subquery: (SELECT id FROM Accounts WHERE Industry = 'Retail' AND id IN (...))

This filters Accounts by the "Retail" industry and ensures that only those whose ID appears in the innermost subquery are selected.

Main Query: SELECT Full_Name, Email FROM Contacts WHERE Account_Name IN (...)

Finally, the main query retrieves the Full_Name and Email of all Contacts whose Account_Name matches the id values returned by the middle subquery.

Note: COQL supports a maximum subquery nesting depth of 5, and you can include up to 5 subqueries total within a single query. The nesting limit refers to subqueries embedded within the WHERE clause of another subquery. 

Subqueries in COQL are a game-changer for developers looking to build efficient, context-aware queries across modules—allowing dynamic filtering that was previously only possible with multiple API calls. While JOINs help you fetch rich, multi-module data in a single response, subqueries let you filter records based on conditions from related modules. And when you combine the two, you unlock a powerful mechanism to tackle real-world CRM business cases with precision and clarity.

For advanced use cases, don’t hesitate to nest subqueries—COQL allows up to five levels deep—giving you the flexibility to build truly nuanced filters. Mastering the balance between JOINs and subqueries is key to writing smarter, cleaner, and more performant queries.

We hope you found this guide useful in understanding and implementing COQL subqueries. If you have any questions or require further clarification, please don't hesitate to leave a comment below or reach out to us directly at support@zohocrm.com. 

Keep experimenting, and as always, happy querying!

      Previous Kaizen: Kaizen #184: Using Widgets in ZET CLI and ZDK CLI  |  Kaizen Directory

Further Reading:

• Kaizen #183 - COQL API's Enhancements in Zoho CRM API Version 7
  
• COQL API - Overview
  
• Subquery Help
  
• JOINS Help
  
• Kaizen #80 - COQL API - Part I
  
• Kaizen #81 - COQL API - Part II
  
• Kaizen #171: FAQs on COQL API

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