Introduction to Semi-Join in SAQL

Описание: In this session, we introduce the concept of Semi-Join in SAQL — a powerful but often misunderstood join type used for existence-based filtering rather than data merging.

As defined in the SAQL Guide :
A semi-join returns rows from one data stream when one or more matching rows exist in the second stream. Each matched row is returned only once.

Unlike regular joins , a semi-join does not bring columns from the second dataset.
It simply answers a business question like:
👉 "Does a related record exist?"

Use Case Covered
We solve a practical scenario:
Find all Accounts that have at least one Opportunity .

Validation Approach
We validate the SAQL result using an equivalent SOQL query:

SELECT Id, Name FROM Account WHERE Id IN
(SELECT AccountId FROM Opportunity)

This confirms that SAQL Semi-Join behaves like an EXISTS / IN filter , not a relational join.

Key Learning
• Semi-Join is used for filtering by relationship presence
• It avoids row explosion and unnecessary data duplication
• Ideal for "at least one related record" type analytics questions

💬 Comment "SEMIJOIN" if this clarified when to use semi-joins instead of regular joins.

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