How to Fix DECLARE CURSOR Is Not Supported Error in Microsoft Fabric

Analyze the logic inside your cursor loop to determine if it is updating records, inserting data, or calculating running totals.

Rewrite the cursor loop into a single, comprehensive `UPDATE ... FROM ... JOIN` or `INSERT INTO ... SELECT` statement to process all rows at once.

If the cursor is being used for sequential calculations or running totals, use T-SQL window functions like `ROW_NUMBER()`, `SUM() OVER()`, or `LAG()` to achieve the same result without looping.

Insert the records you need to process into a temporary table and use the `ROW_NUMBER()` function to assign a sequential ID (e.g., 1, 2, 3) to each row.

Declare integer variables for a loop counter (`@i` set to 1) and a maximum row count (`@max` set to the total number of rows in your temporary table).

Write a `WHILE @i <= @max` loop. Inside the loop, select the data where the sequential ID equals `@i`, perform your custom operations, and then increment the counter (`SET @i = @i + 1`) at the end of the loop.

Open your web browser and go to the official Microsoft Q&A community platform.

Create a new question and tag it under the 'Microsoft Fabric' category to ensure it reaches the right dedicated support engineers.

Include a sanitized version of your unsupported DECLARE CURSOR script so engineers can recommend a specific, supported processing method tailored to your schema.