PostgreSQL 92% solution
\n\n# Code\npostgresql []\n-- Write your PostgreSQL query statement below\nWITH cte AS\n( \n    SELECT\n        product_id,\n        COUNT(sale_date) FILTER (WH
\n\n# Code\n```postgresql []\n-- Write your PostgreSQL query statement below\nWITH cte AS\n( \n    SELECT\n        product_id,\n        COUNT(sale_date) FILTER (WHERE sale_date BETWEEN \'2019-01-01\' AND \'2019-03-31\') AS first_quarter_sales,\n        COUNT(sale_date) AS all_sales\n    FROM Sales\n    GROUP BY product_id\n)\nSELECT\n    cte.product_id,\n    Product.product_name\nFROM cte \nJOIN Product ON cte.product_id = Product.product_id\nWHERE first_quarter_sales = all_sales;\n```
['PostgreSQL']