左在谷歌大查詢加入

Question

我有這樣的錯誤「ON子句必須與每個表一字段名=比較，與表名前綴的字段名。

這LEFT JOIN僅用於c.Network，其他情況下不需要，我明白錯誤，但兩個表之間沒有共同的字段（bigdata：RawDebug.T和bigdata：RawDebug.CarrierDetails），所以我不能在「ON」語句中引用兩個表。

任何幫助，將不勝感激!!

DEFINE QUERY Test2 
SELECT 
HardwareId, DebugReason, DebugData, 
CASE 
    WHEN lower(DebugData) LIKE 'ver%' THEN 'Verizon' 
    WHEN REGEXP_MATCH(DebugData,'\\d+') THEN c.Network 
    ELSE REGEXP_REPLACE(DebugData,'\\?',' ') 
END 
as ActualDebugData 
FROM (TABLE_DATE_RANGE([bigdata:RawDebug.T],TIMESTAMP ('2016-05-15'),TIMESTAMP('2016-05-15'))) as d 
LEFT JOIN [bigdata:RawDebug.CarrierDetails] as c ON c.Mcc = 289 AND c.Mnc = 88 
    WHERE d.reason = 50013 

Answer 1

SELECT 
    HardwareId, DebugReason, DebugData, 
    CASE 
    WHEN LOWER(DebugData) LIKE 'ver%' THEN 'Verizon' 
    WHEN REGEXP_MATCH(DebugData,'\\d+') THEN c.Network 
    ELSE REGEXP_REPLACE(DebugData,'\\?',' ') 
    END AS ActualDebugData 
FROM (
    SELECT * 
    FROM TABLE_DATE_RANGE([bigdata:RawDebug.T],TIMESTAMP ('2016-05-15'),TIMESTAMP('2016-05-15')) 
) AS d 
CROSS JOIN (
    SELECT Network 
    FROM [bigdata:RawDebug.CarrierDetails] 
    WHERE Mcc = 289 AND Mnc = 88 
    LIMIT 1 
) AS c 
WHERE d.reason = 50013 

或改善（每費利佩建議）性能：

SELECT 
    HardwareId, DebugReason, DebugData, 
    CASE 
    WHEN LOWER(DebugData) LIKE 'ver%' THEN 'Verizon' 
    WHEN REGEXP_MATCH(DebugData,'\\d+') THEN c.Network 
    ELSE REGEXP_REPLACE(DebugData,'\\?',' ') 
    END AS ActualDebugData 
FROM (
    SELECT 
    HardwareId, DebugReason, DebugData 
    FROM TABLE_DATE_RANGE([bigdata:RawDebug.T],TIMESTAMP ('2016-05-15'),TIMESTAMP('2016-05-15')) 
    WHERE reason = 50013  
) AS d 
CROSS JOIN (
    SELECT Network 
    FROM [bigdata:RawDebug.CarrierDetails] 
    WHERE Mcc = 289 AND Mnc = 88 
    LIMIT 1 
) AS c