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我想從表中動態刪除所有NULLS。下面的腳本適用於Money數據類型,但現在在將nvarchar值ProjectName轉換爲數據類型int錯誤時拋出'轉換失敗。我不明白它在說什麼轉換。動態NULL刪除,轉換失敗,但沒有轉換
-- Get columns to remove nulls from
SELECT c.column_id,c.name,c.system_type_id,t.name as [Type]
INTO #Temp
FROM sys.columns c
JOIN sys.types t ON c.system_type_id = t.system_type_id
JOIN sys.tables st ON c.object_id = st.object_id
WHERE st.name = 'Project'
AND t.name = 'varchar'--in ('int','datetime','bit','varchar') --'money'
ORDER BY t.name--c.column_id
SELECT * FROM #Temp
--Build SQL query to update null columns to blanks
DECLARE @CID int = 1;
DECLARE @CName nvarchar(30);
DECLARE @SQL_STRING nvarchar(500);
DECLARE @MaxCID int = (SELECT MAX(column_id) FROM #Temp)
WHILE (@CID <= @MaxCID)
BEGIN
SET @CName = (SELECT name FROM #Temp t WHERE @CID = t.column_id)
SET @SQL_STRING = N'UPDATE orders.Project SET ' + @CName + ' = ISNULL('[email protected]+','''');'
EXEC sp_executesql @SQL_STRING
SET @CID = (@CID + 1)
PRINT @CID + @CName
END
drop table #Temp