Question

我有一张像this这样的表格：
我的任务是准备一个查询列表KPI和计算它们。

1）首先我尝试了这样的陈述（缩短）：

select case  
        When PROTOCOLID = 61002 AND TRANS_STATS_TYPE = 3 THEN "S11 Session Successes"
        When PROTOCOLID = 61002 AND TRANS_STATS_TYPE = 3 AND (CAUSE_CODE is NULL OR CAUSE_CATEGORY="S") THEN "S11 Update Successes"  
        When PROTOCOLID = 61002 AND TRANS_STATS_TYPE = 7 THEN "Modify Access Bearer Successes"   
    End kpi_name, Sum(count) cnt

这给我带来了两个问题：
1）case-when语句在满足第一个条件时停止，因此它会成功确定行并将其标记为＆＃34; S11 Session Successs＆＃34; 但它不会识别＆＃34; S11 Update Sucesses＆＃34; 除非我建立联盟并在另一个选择中写入。

2）如果没有具有相关条件的行，则结果将根本不显示KPI名称。我希望显示的行包含KPI名称和null或0值。我试图使用if语句实现这一点，但是我发现将越来越多的condidtions嵌套到一个大的if语句中是相当讨厌并且不容易修改。

有没有更优雅的方式来实现这两个我失踪？谢谢

编辑：要提供更多信息：此查询会产生错误的结果：

select case
    --When S1AP_SGS_PROTOCOL_ID = 36412 AND S1AP_SGS_TRANS_TYPE = 16 AND ( S1AP_SGS_TRANS_CAUSE_VALUE is NULL OR CAUSE_CATEGORY="S")                    THEN     "HO Preparation Successes"
    When S1AP_SGS_PROTOCOL_ID = 36412 AND S1AP_SGS_TRANS_TYPE = 16    THEN     "HO Preparation Attempts"
    End kpi_name,                       
    Sum(trans_count) cnt

 From  s1mme_agg_start_time_2017022811                      
    where time >= "2017-02-28 11:00:00" and time < "2017-02-28 12:00:00"
    group by kpi_name

HO准备尝试4560
HO准备成功28

虽然此查询提供了正确的结果：

 select 
    When S1AP_SGS_PROTOCOL_ID = 36412 AND S1AP_SGS_TRANS_TYPE = 16 THEN "HO Preparation Attempts"
End kpi_name,                       
Sum(trans_count) cnt

From  s1mme_agg_start_time_2017022811                      
where time >= "2017-02-28 11:00:00" and time < "2017-02-28 12:00:00"
group by kpi_name

union

select case
    When S1AP_SGS_PROTOCOL_ID = 36412 AND S1AP_SGS_TRANS_TYPE = 16 AND ( S1AP_SGS_TRANS_CAUSE_VALUE is NULL OR CAUSE_CATEGORY="S")                    THEN     "HO Preparation Successes"

        End kpi_name,                       
    Sum(trans_count) cnt

From  s1mme_agg_start_time_2017022811                      
    where time >= "2017-02-28 11:00:00" and time < "2017-02-28 12:00:00"
    group by kpi_name

HO准备尝试4588
HO准备成功28

Answer 1

首先检查条件越有选择性，然后使用else管理无值

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命名列有条件

1 个答案: