The primary reason for this issue is to ensure data consistency between tables A and B. When inserting or updating a row in table A, we want to delete rows from table B that have matching values in their Desc column.An alternative reason is to avoid duplicate records in table B. If a new record is i

How do I fix: 🔧 Proven Troubleshooting Steps Trigger Design Method?

Step 1: Step 1: Create a trigger function that checks if the inserted/updated value exists in the Desc column of table B.Step 2: Use a SQL query to compare the inserted/updated value with the values in the Desc column of table B. You can use a subquery or join to achieve this.Step 3: If a match is f

How do I fix: Alternative Trigger Design Method?

Step 1: Step 1: Create two separate triggers - one for Insert and one for Update. This will allow us to handle both cases independently.Step 2: For the Insert trigger, check if the inserted value exists in the Desc column of table B before deleting rows.Step 3: For the Update trigger, compare the up

Coding⏱️ 3 min read📅 2026-06-03

How to Fix: Insert Update trigger how to determine if insert or update

Write an Insert/Update trigger to delete rows from table B based on a value in table A's Col1 and Desc columns.

Quick Answer: Use a WHERE clause with a NOT EXISTS condition for inserts, and update the row in table B if it exists in table A.

📋 Table of Contents

⚠️ Common Causes
🔧 Proven Troubleshooting Steps
💡 Conclusion

Insert Update Trigger: Determining Insert or Update Cases

This guide aims to provide a step-by-step approach to writing an Insert, Update Trigger that handles both Insert and Update cases. The trigger will delete all rows from table B whose one column (say Desc) has values like the value inserted/updated in the table A's column (say Col1).

⚠️ Common Causes

The primary reason for this issue is to ensure data consistency between tables A and B. When inserting or updating a row in table A, we want to delete rows from table B that have matching values in their Desc column.
An alternative reason is to avoid duplicate records in table B. If a new record is inserted into table A with a value already present in the Desc column of table B, we don't want that record to be duplicated in table B.

🔧 Proven Troubleshooting Steps

Trigger Design Method

Step 1: Step 1: Create a trigger function that checks if the inserted/updated value exists in the Desc column of table B.
Step 2: Use a SQL query to compare the inserted/updated value with the values in the Desc column of table B. You can use a subquery or join to achieve this.
Step 3: If a match is found, delete the corresponding row from table B.

Alternative Trigger Design Method

Step 1: Step 1: Create two separate triggers - one for Insert and one for Update. This will allow us to handle both cases independently.
Step 2: For the Insert trigger, check if the inserted value exists in the Desc column of table B before deleting rows.
Step 3: For the Update trigger, compare the updated value with the values in the Desc column of table B after updating the row.

💡 Conclusion

To determine if the trigger is executed for an update or insert, you can use a combination of SQL functions such as NEW and OLD tables. In an Insert trigger, the NEW table will contain the inserted values, while in an Update trigger, the NEW table will contain the updated values. By comparing these values with the existing rows in table B, you can determine if it's an insert or update case.

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