SQL在视图中创建一个视图与交叉引用两个表的结果

Question

我不熟悉SQL，试图创建一个视图，该视图组合来自读数据库和失败数据库的数据。我想创建一个按目标名称，度量标准名称，然后按时间戳排序的视图，并附加一列，返回1表示当天出现故障，否则返回零。我写的查询目前正在阅读，我错过了一个正确的括号，但是当我消除括号时，它发现表名无效。我不确定我的案件使用是否导致了它，虽然它已经在一些练习样本上工作。任何帮助检查和如何改善它的建议将不胜感激。

SELECT * FROM 
(
with new_failure_table as (
    SELECT target_name, END_TIMESTAMP,START_TIMESTAMP, 
    ((END_TIMESTAMP - (START_TIMESTAMP))*24*60) 
    FROM failure_table 
    WHERE (END_TIMESTAMP - (START_TIMESTAMP))*24*60 >5 
    AND (END_TIMESTAMP - START_TIMESTAMP) < 1 
    and availability_status = 'Target Down' 
    ) 
    -- Simplifies failure table to include actual failures according to two parameters 

SELECT 
    t1.target_name, 
    t1.metric_name, 
    t1.rollup_timestamp, 
    t1.average, 
    t1.minimum, 
    t1.maximum, 
    t1.standard_deviation, 
    t2.END_TIMESTAMP, 
    t2.START_TIMESTAMP, 
    (CASE 
    when t1.target_name = t2.target_name 
    and t1.rollup_timestamp = trunc(END_TIMESTAMP+1) 
    and t1.rollup_timestamp = trunc(START_TIMESTAMP+1) 
    THEN '1' ELSE '0' END) AS failure_status 
    --Used to create column that reads 1 when there was a failure between the two readings and 0 otherwise  

FROM 
    data_readings AS t1, new_failure_table AS t2 
WHERE t1.target_name = t2.target_name  
) 

GROUP BY t1.target_name, metric_name 
ORDER BY rollup_timestamp desc; 

Answer 1

你不需要包装在括号case相反，它可以

CASE 
when t1.target_name = t2.target_name 
and t1.rollup_timestamp = trunc(END_TIMESTAMP+1) 
and t1.rollup_timestamp = trunc(START_TIMESTAMP+1) 
THEN '1' ELSE '0' END AS failure_status 

在 FROM

也不要使用AS代替：

... 
FROM data_readings AS t1, new_failure_table AS t2 
... 

使用

... 
FROM data_readings t1, new_failure_table t2 
... 

UPD：整个查询应该是这样的

SELECT * FROM 
(
with new_failure_table as (
    SELECT target_name, END_TIMESTAMP,START_TIMESTAMP, 
    ((END_TIMESTAMP - (START_TIMESTAMP))*24*60) 
    FROM failure_table 
    WHERE (END_TIMESTAMP - (START_TIMESTAMP))*24*60 >5 
    AND (END_TIMESTAMP - START_TIMESTAMP) < 1 
    and availability_status = 'Target Down' 
    ) 
    -- Simplifies failure table to include actual failures according to two parameters 

SELECT 
    t1.target_name as target_name, 
    t1.metric_name as metric_name, 
    t1.rollup_timestamp as rollup_timestamp, 
    t1.average, 
    t1.minimum, 
    t1.maximum, 
    t1.standard_deviation, 
    t2.END_TIMESTAMP, 
    t2.START_TIMESTAMP, 
    CASE 
    when t1.target_name = t2.target_name 
    and t1.rollup_timestamp = trunc(END_TIMESTAMP+1) 
    and t1.rollup_timestamp = trunc(START_TIMESTAMP+1) 
    THEN '1' ELSE '0' END AS failure_status 
    --Used to create column that reads 1 when there was a failure between the two readings and 0 otherwise  

FROM 
    data_readings t1, new_failure_table t2 
WHERE t1.target_name = t2.target_name  
) 
GROUP BY target_name, metric_name 
ORDER BY rollup_timestamp desc;