SQL服務器 - 刪除多列有空值或零值的行

我是一個DB新手，並且正在爲此而掙扎。我有以下幾列現有表：SQL服務器 - 刪除多列有空值或零值的行

Showroom, Salesperson, Time1, Time2, Time3, Dte

我想有null或在所有3分時間列零個值表中刪除所有行。我嘗試了以下方法：

DELETE FROM myTable 
WHERE EXISTS(
       SELECT * 
       FROM myTable 
       WHERE (Time1 IS NULL OR Time1 = 0) 
       AND (Time2 IS NULL OR Time2 = 0) 
       AND (Time3 IS NULL OR Time3 = 0) 
      )

謝天謝地，我正在研究數據庫的測試版本，因爲我擦除了所有數據。任何幫助將真正被讚賞。

來源

2011-02-10 Kathy

見任何下文正確的方法的答案。你所寫的刪除所有數據的原因是Exists在存在的語句返回任何記錄時是真的。 – 2011-02-10 21:36:12

你想要的只是;

DELETE myTable 
WHERE 
    (Time1 IS NULL OR Time1 = 0) 
    AND (Time2 IS NULL OR Time2 = 0) 
    AND (Time3 IS NULL OR Time3 = 0)

來源

2011-02-10 21:32:20

感謝您的幫助，並儘快回覆。 – Kathy 2011-02-10 21:44:14

的EXISTS是多餘的（因爲是FROM - 它不需要DELETE S）：

DELETE myTable 
WHERE ((Time1 IS NULL OR Time1 = 0) 
    AND (Time2 IS NULL OR Time2 = 0) 
    AND (Time3 IS NULL OR Time3 = 0))

來源

2011-02-10 21:32:39 Oded

謝謝您的及時答覆！ – Kathy 2011-02-10 21:43:39

試試這個：

DELETE 
FROM myTable 
WHERE 
    (Time1 IS NULL OR Time1 = 0) AND 
    (Time2 IS NULL OR Time2 = 0) AND 
    (Time3 IS NULL OR Time3 = 0)

的原因，所有的你記錄被刪除的原因是，只要存在單個記錄對於所有三列都具有NULL或0的情況，EXISTS結果就爲真。由於delete語句不識別哪些記錄刪除您的WHERE子句，它本質上是一樣的DELETE FROM myTable WHERE 1=1

來源

2011-02-10 21:33:18 nybbler

的查詢應是這樣的：

DELETE 
FROM myTable 
WHERE (Time1 IS NULL OR Time1 = 0) 
AND (Time2 IS NULL OR Time2 = 0) 
AND (Time3 IS NULL OR Time3 = 0)

在做DELETE報表我想 it 是總是最好先創建您的SELECT聲明，然後再更改它。

SELECT * --If this returns the correct records, simply change to DELETE 
FROM myTable 
WHERE (Time1 IS NULL OR Time1 = 0) 
AND (Time2 IS NULL OR Time2 = 0) 
AND (Time3 IS NULL OR Time3 = 0)

來源

2011-02-10 21:35:03 jon3laze

絕不要在沒有運行select的情況下先執行刪除操作，以查看哪些記錄將受到影響，並且在運行臨時刪除查詢時，在不運行提交的情況下將其放入事務中，直到看到有多少記錄受到影響爲止。 – HLGEM 2011-02-10 21:40:09

DELETE myTable WHERE 
(ISNULL(Time1,0) = 0) AND (ISNULL(Time2,0) = 0) AND (ISNULL(Time3,0) = 0)

來源

2015-09-22 06:03:23

SQL服務器 - 刪除多列有空值或零值的行

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