A naukri.com initiative
Amazon
1w
265
Image Credit: Amazon
Transition a pivot query that includes dynamic columns from SQL Server to PostgreSQL
- When transitioning from SQL Server to PostgreSQL and dealing with the PIVOT function for dynamic reports, a workaround involves using PostgreSQL's crosstab function.
- The previous solution using CASE WHEN for each pivoted column in SQL Server is shown to have limitations in terms of scalability and code maintenance.
- PostgreSQL's crosstab offers flexibility by dynamically generating columns based on query results, making it suitable for varying data sets.
- The implementation involves creating a new function in PostgreSQL, get_dynamic_pivot_data, to mimic SQL Server's PIVOT functionality.
- The solution handles multiple fixed and variable columns in a pivot table, using a psycopg2 cursor and refcursor.
- Prerequisites for testing include configuring AWS settings, installing PostgreSQL clients, and using tools like pgAdmin or psql.
- On the SQL Server side, the PIVOT function is used to pivot dynamic columns and generate pivot tables after creating necessary tables and stored procedures.
- In PostgreSQL, the crosstab function is employed, and sample tables are created with similar data to SQL Server.
- The PostgreSQL function get_dynamic_pivot_data is implemented to handle dynamic columns and return pivot-like query results.
- Additionally, testing the PostgreSQL function with C# involves using the Npgsql package and incorporating AWS SDK and Secrets Manager for security.
Read Full Article
15 Likes
For uninterrupted reading, download the app