How to Pivot Data in SQL Server 2000 Without Dynamic SQL?

How to Pivot Data in SQL Server 2000

Facing the challenge of transforming your data into a more pivot-structured format using SQL Server 2000? Let's delve into a solution that avoids the pitfalls of dynamic SQL and ineffective approaches, ensuring accuracy and efficiency in your data manipulations.

Understanding the Problem

Imagine you have two tables: Products containing product information and Product Meta providing additional metadata for each product. Your goal is to create a result set that pivots the data to present it in a tabular format, displaying the product names along with the corresponding metadata values.

The Solution

To achieve this transformation, we will utilize the CASE expression in conjunction with aggregate functions within a GROUP BY clause:

SELECT P.ProductId, P.Name
    , MIN(CASE WHEN PM.MetaKey = 'A' THEN PM.MetaValue END) AS A
    , MIN(CASE WHEN PM.MetaKey = 'B' THEN PM.MetaValue END) AS B
    , MIN(CASE WHEN PM.MetaKey = 'C' THEN PM.MetaValue END) AS C
FROM Products AS P
JOIN ProductMeta AS PM
    ON PM.ProductId = P.ProductId
GROUP BY P.ProductId, P.Name

Explanation

• The CASE expression evaluates the MetaKey column in the Product Meta table and returns the corresponding MetaValue if the key matches the specified condition (A, B, or C).
• The MIN aggregate function is applied to each CASE expression to ensure that only the smallest value is retrieved for each product ID.
• The GROUP BY clause groups the results by the ProductId and Name columns, ensuring that the aggregated values are associated with the correct products.

By utilizing this approach, you can effectively pivot your data in SQL Server 2000, avoiding the limitations of dynamic SQL and producing a clean and usable result set that meets your transformation requirements.

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