Alternative Methods for Batch Inserts with Sequence Values in Oracle

Using INSERT ALL with a subquery:

This approach uses a single INSERT ALL statement with a subquery to generate the desired rows.

INSERT ALL
INTO your_table (column1, column2)
VALUES (my_sequence.NEXTVAL, 'value1')
INTO your_table (column1, column2)
VALUES (my_sequence.NEXTVAL, 'value2')
SELECT * FROM DUAL;

Here, my_sequence.NEXTVAL is used within the subquery for each row, ensuring unique sequence values are generated.

Using a CTE (Common Table Expression):

This method involves creating a CTE that generates the desired data, including the sequence value, and then referencing it in the INSERT statement.

WITH data AS (
  SELECT my_sequence.NEXTVAL AS id, 'value1' AS col2
  FROM DUAL
  UNION ALL
  SELECT my_sequence.NEXTVAL, 'value2' FROM DUAL
)
INSERT INTO your_table (column1, column2)
SELECT id, col2 FROM data;

The CTE defines a temporary named result set (data) containing the desired columns, including the sequence value generated using my_sequence.NEXTVAL. The INSERT statement then references this data set to insert the rows.

Using a loop (for experienced users):

For more advanced users, a loop can be used to iterate through the desired number of rows, generating sequence values and inserting them with their corresponding data. This method is generally less efficient and more prone to errors compared to the previous methods, so it's recommended only if the other approaches are not feasible.

Related Issues and Solutions:

• Unique constraint violation: If your table has a unique constraint on a column, inserting multiple rows with the same sequence value will raise an error. Use the methods above to ensure unique sequence values for each row.
• Performance considerations: When inserting a large number of rows, using a single INSERT ALL statement or a CTE might be more efficient than a loop.