How to Efficiently Sum Points by Budget ID and Transaction Type Using SQL?

Efficient SQL Query for Summarizing Transaction Data

Extracting data based on multiple criteria is a common task in database management. Imagine a "transactions" table containing account_id, budget_id, points, and transaction type (allocation or issue). The challenge is to efficiently calculate the total points for each budget_id, separated by allocation and issue types.

A concise SQL query can elegantly solve this problem:

<code class="language-sql">SELECT budget_id,
       SUM(CASE WHEN type = 'allocation' THEN points ELSE 0 END) AS allocated,
       SUM(CASE WHEN type = 'issue' THEN points ELSE 0 END) AS issued
FROM transactions
GROUP BY budget_id;</code>

This query leverages the CASE statement within the SUM() function. The CASE WHEN type = 'allocation' THEN points ELSE 0 END expression checks the transaction type. If it's 'allocation', the corresponding points value is summed; otherwise, 0 is added. This conditional summation is repeated for 'issue' type transactions.

Grouping the results by budget_id provides a summary showing the allocated and issued points for each budget. The output clearly presents a consolidated view of the transaction data, facilitating analysis and reporting.

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