如何根据 SQL 中的组值过滤行？

Question

我有一个table格式如下

serialnumber,test,result
-------------------------
ABC          1    "TOO HIGH"
ABC          2    "PASS"
ABC          3    "TOO LOW"
DEF          1    "PASS"
DEF          2    "PASS"
DEF          3    "PASS"

我需要做两个操作：

1) 对于每个有全部通过记录的序列号，我需要将其汇总为一条记录

2) 对于每个包含 "TOO HIGH" 或 "TOO LOW" 记录的序列，我需要排除该序列号的所有 "PASS" 记录

我将如何在 teradata 15 中执行此操作，最好是在单个语句中？

Answer 1

考虑结合两个条件的联合查询，对#1 使用聚合查询，对#2 使用派生表的内部联接查询。希望 Teradata 的方言支持语法：

SELECT  TableName.SerialNumber, 
        Min(TableName.Test) As Test, 
        Min(TableName.Result) As Result
FROM SerialNumber
GROUP BY SerialNumber
HAVING Sum(CASE WHEN TableName.Result='"PASS"' THEN 1 ELSE 0 END) = Count(*)

UNION

SELECT  TableName.SerialNumber, 
        TableName.Test, 
        TableName.Result
FROM SerialNumber    
INNER JOIN 
      (SELECT SerialNumber FROM SerialNumber 
       WHERE TableName.Result = '"TOO HIGH"') AS toohighSub
INNER JOIN 
      (SELECT SerialNumber FROM SerialNumber 
       WHERE TableName.Result = '"TOO LOW"') AS toolowSub
ON toolowSub.SerialNumber = toohighSub.SerialNumber
ON TableName.SerialNumber = toolowSub.SerialNumber
WHERE TableName.Result <> '"PASS"';

Answer 2

SELECT *
FROM tab
QUALIFY
  -- #1, only PASS
  (     SUM(CASE WHEN result <> 'PASS' THEN 1 ELSE 0 end) 
        OVER (PARTITION BY serialnumber) = 0 
    AND ROW_NUMBER() 
        OVER (PARTITION BY serialnumber
              ORDER BY test) = 1
  )
 OR
  -- #2
  (     SUM(CASE WHEN result <> 'PASS' THEN 1 ELSE 0 end) 
        OVER (PARTITION BY serialnumber) > 0 
    AND result_ <> 'PASS'
  )

如何根据 SQL 中的组值过滤行？

How to filter rows based on group values in SQL?

sql

teradata