[英]SQL - add new column based off of existing column value (1 row)
One approach uses aggregation:一种方法使用聚合:
SELECT SUM(Sum) AS Sum, ss_source, case_id,
CASE WHEN COUNT(CASE WHEN ss_use_type = 'delta' THEN 1 END) > 0
THEN 'Y' ELSE 'N' END AS payoff
FROM yourTable
GROUP BY ss_source, case_id;
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