我想從輸出在mysql中刪除這些空值我有事件列，我分爲3,4,5,6列

SELECT t1.client_name,FROM_UNIXTIME(t1.timestamp,"%d")AS Date, 
case whent1.event='ALL_OFF'then 
    (SUM(Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp), 
     FROM_UNIXTIME(t1.timestamp)))) end as ALL_OFF, 
case when t1.event = 'HOME_ON' then 
    (SUM(Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp) , 
     FROM_UNIXTIME(t1.timestamp)))) end as HOME_ON, 
case when t1.event = 'OFFICE_ON' then 
    (SUM(Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp) , 
     FROM_UNIXTIME(t1.timestamp)))) end as OFFICE_ON, 
case when t1.event = 'PARTY_ON' then 
    (SUM(Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp) , 
     FROM_UNIXTIME(t1.timestamp)))) end as PARTY_ON, 
case when t1.event = 'OUTDOOR_ON' then 
    (SUM(Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp) , 
     FROM_UNIXTIME(t1.timestamp)))) end as OUTDOOR_ON 
FROM logs13 AS t1 
JOIN logs13 AS t2 ON (t2.id = t1.id - 1) 
     where t1.wonderFit_ID = '0000000037fd0ef6' and t1.client_name ='Puma' And FROM_UNIXTIME(t1.timestamp,"%Y")='2017' and FROM_UNIXTIME(t1.timestamp,"%M")='April' and Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp) , FROM_UNIXTIME(t1.timestamp)) >= 0 
group by t1.event, FROM_UNIXTIME(t1.timestamp,"%d") 
order by FROM_UNIXTIME(t1.timestamp,"%d");

來源

2017-10-06 Tanvi Bansal

什麼樣的價值，你在空的地方期待？

如果你需要像0空的地方，你可以使用以下格式

CASE WHEN expr1 = expr2 THEN value1 ELSE value2 END

例子：

CASE when t1.event='ALL_OFF' THEN (SUM(Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp), FROM_UNIXTIME(t1.timestamp)))) ELSE 0 END as ALL_OFF

來源

2017-10-06 06:42:59

我不想0以及因爲當使用趨勢線在我的儀表盤我沒有看起來good..so我希望值僅 –

燦你給你的預期產出？這將有所幫助 –

**我不想要0 **，但這些是數字列，您必須將所有數字轉換爲字符串才能輸出''而不是NULL。如果要將這些列保留爲數字，則它爲零或NULL。 –

將整個案件表達的SUM（情況下，當內.. 。否則...結束）函數，然後使用COALESCE（SUM（...），0）

SELECT 
     t1.client_name 
     , FROM_UNIXTIME(t1.timestamp,"%d") AS Date 
     , COALESCE(SUM(case when t1.event = 'ALL_OFF' then Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp),FROM_UNIXTIME(t1.timestamp)) end),0) as ALL_OFF 
     , COALESCE(SUM(case when t1.event = 'HOME_ON' then Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp),FROM_UNIXTIME(t1.timestamp)) end),0) as HOME_ON 
     , COALESCE(SUM(case when t1.event = 'OFFICE_ON' then Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp),FROM_UNIXTIME(t1.timestamp)) end),0) as OFFICE_ON 
     , COALESCE(SUM(case when t1.event = 'PARTY_ON' then Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp),FROM_UNIXTIME(t1.timestamp)) end),0) as PARTY_ON 
     , COALESCE(SUM(case when t1.event = 'OUTDOOR_ON' then Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp),FROM_UNIXTIME(t1.timestamp)) end),0) as OUTDOOR_ON 
FROM logs13 AS t1 
JOIN logs13 AS t2 ON (t2.id = t1.id - 1) 
WHERE t1.wonderFit_ID = '0000000037fd0ef6' 
AND t1.client_name ='Puma' 
AND FROM_UNIXTIME(t1.timestamp,"%Y")='2017' 
AND FROM_UNIXTIME(t1.timestamp,"%M")='April' 
AND Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp) , FROM_UNIXTIME(t1.timestamp)) >= 0 
GROUP BY t1.event, FROM_UNIXTIME(t1.timestamp,"%d") 
ORDER BY FROM_UNIXTIME(t1.timestamp,"%d") 
;

在MySQL中，你可以使用IFNU LL（）而不是COALESCE（），但後期是SQL標準的一部分，我覺得儘可能避免使用dbms特定函數會更好。

或oputput「」而不是零

SELECT 
     t1.client_name 
     , FROM_UNIXTIME(t1.timestamp,"%d") AS Date 
     , COALESCE(CAST(SUM(case when t1.event = 'ALL_OFF' then Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp),FROM_UNIXTIME(t1.timestamp)) end) AS CHAR),'') as ALL_OFF 
     , COALESCE(CAST(SUM(case when t1.event = 'HOME_ON' then Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp),FROM_UNIXTIME(t1.timestamp)) end) AS CHAR),'') as HOME_ON 
     , COALESCE(CAST(SUM(case when t1.event = 'OFFICE_ON' then Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp),FROM_UNIXTIME(t1.timestamp)) end) AS CHAR),'') as OFFICE_ON 
     , COALESCE(CAST(SUM(case when t1.event = 'PARTY_ON' then Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp),FROM_UNIXTIME(t1.timestamp)) end) AS CHAR),'') as PARTY_ON 
     , COALESCE(CAST(SUM(case when t1.event = 'OUTDOOR_ON' then Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp),FROM_UNIXTIME(t1.timestamp)) end) AS CHAR),'') as OUTDOOR_ON 
FROM logs13 AS t1 
JOIN logs13 AS t2 ON (t2.id = t1.id - 1) 
WHERE t1.wonderFit_ID = '0000000037fd0ef6' 
AND t1.client_name ='Puma' 
AND FROM_UNIXTIME(t1.timestamp,"%Y")='2017' 
AND FROM_UNIXTIME(t1.timestamp,"%M")='April' 
AND Timestampdiff(MINUTE,FROM_UNIXTIME(t2.timestamp) , FROM_UNIXTIME(t1.timestamp)) >= 0 
GROUP BY t1.event, FROM_UNIXTIME(t1.timestamp,"%d") 
ORDER BY FROM_UNIXTIME(t1.timestamp,"%d") 
;

來源

2017-10-06 07:01:19

顯示varchar是意外的 –

*顯示varchar是意外的* ..有更多的信息嗎？錯誤消息？你有什麼試圖解決它？請注意我無法運行您的查詢 –

我附上錯誤 –

我想從輸出在mysql中刪除這些空值我有事件列，我分爲3,4,5,6列

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