Question

我有一个包含测试结果记录的oracle数据库表。每条记录都包含测试START_TIME，执行测试的INSTRUMENT，以及测试期间发生错误的ERROR_CODE以及其他信息。

对于ERROR_CODE等于'5900'，'6900'或'5905'的每条记录，我需要确定在错误记录的日期时间之前INSTRUMENT上发生的成功测试次数（ERROR_CODE = null）。换句话说，我需要知道在生成错误之前在仪器上执行的成功测试的数量。

该数据库包含500多种仪器，每种仪器可以有1到500,000个测试记录。

注意：只对ERROR_CODES'5900'，'6000'和'5905'之前的成功次数感兴趣。有些工具可能没有这些错误。有些仪器可能有多个连续错误，但它们之间没有成功。该仪器的第一次或最后一次测试可能发生错误。

示例：

START_TIME          INSTRUMENT  ERROR_CODE
12/1/2015 22:15:03  A540        null
12/1/2015 22:17:14  A700        null
12/1/2015 22:17:53  A700        null
12/1/2015 22:19:24  A700        5905
12/1/2015 23:28:15  A700        null
12/1/2015 23:35:10  A540        6000
12/2/2015 02:15:13  A540        5900
12/2/2015 03:07:03  A540        null
12/2/2015 03:44:52  A540        null
12/2/2015 09:15:56  A700        null
12/2/2015 14:17:09  A700        5900
12/2/2015 17:15:42  A980        null
12/3/2015 08:17:53  A540        5900
12/3/2015 08:18:49  A540        5900
12/3/2015 11:17:57  A540        null

应该给出以下结果

ERROR_TIME          INSTRUMENT  SUCCESSES_BEFORE_ERROR
12/1/2015 22:19:24  A700        2
12/1/2015 23:35:10  A540        1
12/2/2015 02:15:13  A540        1
12/2/2015 14:17:09  A700        4
12/3/2015 08:17:53  A540        3
12/3/2015 08:18:49  A540        3

Answer 1

以下是使用分析函数的方法：

WITH test_results AS (SELECT to_date('12/01/2015 22:15:03', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A540' instrument, NULL ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/01/2015 22:17:14', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A700' instrument, NULL ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/01/2015 22:17:53', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A700' instrument, NULL ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/01/2015 22:19:24', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A700' instrument, 5905 ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/01/2015 23:28:15', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A700' instrument, NULL ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/01/2015 23:35:10', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A540' instrument, 6000 ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/02/2015 02:15:13', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A540' instrument, 5900 ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/02/2015 03:07:03', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A540' instrument, NULL ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/02/2015 03:44:52', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A540' instrument, NULL ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/02/2015 09:15:56', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A700' instrument, NULL ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/02/2015 14:17:09', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A700' instrument, 5900 ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/02/2015 17:15:42', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A980' instrument, NULL ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/03/2015 08:17:53', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A540' instrument, 5900 ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/03/2015 08:18:49', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A540' instrument, 5900 ERROR_CODE FROM dual UNION ALL
                      SELECT to_date('12/03/2015 11:17:57', 'mm/dd/yyyy hh24:mi:ss') start_time, 'A540' instrument, NULL ERROR_CODE FROM dual)
-- end of mimicking a table with data in it called "test_results"
-- for use in the following select statement:
SELECT start_time,
       instrument,
       running_total success_before_error
FROM   (SELECT start_time,
               instrument,
               ERROR_CODE,
               sum(CASE WHEN ERROR_CODE IS NOT NULL THEN 0
                        ELSE 1
                   END) OVER (PARTITION BY instrument ORDER BY start_time) running_total
        FROM   test_results)
WHERE  ERROR_CODE IS NOT NULL -- this may need to be "error_code in (5900, 6000, 5905)"
ORDER BY start_time;

START_TIME          INSTRUMENT SUCCESS_BEFORE_ERROR
------------------- ---------- --------------------
12/01/2015 22:19:24 A700                          2
12/01/2015 23:35:10 A540                          1
12/02/2015 02:15:13 A540                          1
12/02/2015 14:17:09 A700                          4
12/03/2015 08:17:53 A540                          3
12/03/2015 08:18:49 A540                          3

Answer 2

可能有一种方法可以通过分析函数来实现这一点（毫无疑问）。但是，在我看来，表达逻辑的最简单方法是使用相关的子查询：

select t.*,
       (select count(*)
        from t t2
        where t2.instrument = t.instrument and
              t2.start_time < t.start_time and
              t2.error_code is null
       ) as SUCCESSES_BEFORE_ERROR
from t
where t.error_code is not null;

Answer 3

我不知道源表名称我称之为table_one。

编辑：正如我现在看到的，我犯了一个错误，我计算了成功测试的问题。我保持原样

ordered_tab as ( 
select  START_TIME           
       ,INSTRUMENT 
       ,ERROR_CODE 
       ,row_number() over (partition by INSTRUMENT order by START_TIME) rn 
  from table_one) 
 select START_TIME  as ERROR_TIME      
       ,INSTRUMENT 
       ,SUCCESSES_BEFORE_ERROR
   FROM ( 
     select START_TIME           
           ,INSTRUMENT 
           ,ERROR_CODE 
           ,rn -1 
           - nvl(last_value(nvl2(ERROR_CODE,rn,null) ignore nulls) 
             over (partition by INSTRUMENT order by START_TIME rows between unbounded preceding and 1 preceding),0) as SUCCESSES_BEFORE_ERROR
      from ordered_tab 
  ) where ERROR_CODE IN (5905, 5900, 6000)

SQL查询以查找失败之间的成功次数

3 个答案: