刪除了記錄計數記錄

Question

當我嘗試運行此

DECLARE @by varchar(20) = 'Myself' 

INSERT INTO dbo.MiscLog(LogType, onTable, Message, CreateBy) 
    SELECT 
     'Info', 'dbo.History', 
     'There are ' + CONVERT(varchar(20), COUNT(ID)) + ' old records being purged.', @by 
    FROM 
     (DELETE FROM dbo.History 
     OUTPUT deleted.ID 
     WHERE keyDate < dateadd(y, -7, getDate())) H 

我得到

消息5322，級別15，狀態1，行5
一個聚集函數是不是在允許的SELECT子句包含嵌套的INSERT，UPDATE，DELETE或MERGE語句。

Answer 1

嘗試將已刪除記錄的副本插入臨時表中，然後在臨時表上運行COUNT（）聚合。

SELECT * 
INTO #tempLog 
    FROM 
     (DELETE FROM dbo.History 
     OUTPUT deleted.ID 
     WHERE keyDate < dateadd(y, -7, getDate())) H 

INSERT INTO dbo.MiscLog(LogType, onTable, Message, CreateBy) 
    SELECT 
     'Info', 'dbo.History', 
     'There are ' + CONVERT(varchar(20), COUNT(ID)) + ' old records being purged.', @by 
FROM #tempLog 

Answer 2

在表上創建一個AFTER DELETE觸發器。您可以查詢deleted的計數。

SELECT COUNT(*) 
FROM deleted