逐级汇总示例(循环逐级累计法).sql

CREATE TABLE tb(ID int PRIMARY KEY,PID int,Num int) INSERT tb SELECT 1,NULL,100 UNION ALL SELECT 2,1   ,200 UNION ALL SELECT 3,2   ,300 UNION ALL SELECT 4,3   ,400 UNION ALL SELECT 5,1   ,500 UNION AL

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