隨機數
SELECT cast(RAND()*10000.10 AS DECIMAL(16,2)) FROM dual
序號
SELECT row_number() over(order by 【排序列】) FROM 【表】
分組序號
SELECT row_number() over(partition BY 【分組列】 order by 【排序列】) FROM 【表】
SELECT cast(RAND()*10000.10 AS DECIMAL(16,2)) FROM dual
SELECT row_number() over(order by 【排序列】) FROM 【表】
SELECT row_number() over(partition BY 【分組列】 order by 【排序列】) FROM 【表】