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我有一个在特定数据库上运行的相当大的查询。此查询所做的是从特定表中选择特定列并将它们转储到新表中。稍后在查询中使用和修改新表。

我遇到的问题是，虽然数据库应该来自同一个程序，但一个数据库可能有 email1、email2 和 email3 列，但下一个可能只有 email1。因为 email1-3 用作 select 语句的一部分，所以当缺少这些列之一时，该部分将失败并且永远不会创建表。

我对此仍然很陌生，所以我的问题可能很简单或很愚蠢，但是当这样的列丢失时，有什么方法可以保存结果？我可以很容易地删除查询中缺少的列并再次运行它，但我想知道是否有更正确的方法来做到这一点？

例子：

SELECT  Customer.[Name], 
    Customer.AcctKey, 
    SUBSTRING(Customer.LastName,1,25) AS [Last Name], 
    SUBSTRING(Customer.FirstName,1,25) AS [First Name], 
    Customer.Add1 AS Address, 
    Customer.Add2 AS Address2, 
    Customer.City, 
    Customer.State,                 
    Customer.Zip, 
    Location.Add1 AS [Ship Address], 
    Location.Add2 AS [Ship Address2], 
    Location.City AS [Ship City], 
    Location.State AS [Ship State], 
    Location.Zip AS [Ship Zip], 
    Customer.Phone1 AS Phone, 
    Customer.Phone2 AS [Alt Phone],
    Customer.Phone3 AS [Cell Phone],
    Customer.Phone4 AS Fax, 
    Customer.lblPhone1, 
    Customer.lblPhone2, 
    Customer.lblPhone3, 
    Customer.lblPhone4, 
    Customer.Terms, 
    Customer.[Key] AS [Account Number], 
    Location.Notes, 
    Location.TaxCode AS [Tax Item], 
    Location.Zone AS [Map Code], 
    Location.Contact, 
    Location.Email, 
    Location.Email6, --Fails because column(s) Email2-6
    Location.Email5, --don't exist in this database
    Location.Email4, --but they might in another
    Location.Email3, --and I'd like to get the data
    Location.Email2, --if they do
    Location.Phone6, 
    Location.Phone5

INTO [01Parents]
FROM Customer 
INNER JOIN Location ON Customer.[Key] = Location.[Key]
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1 回答 1

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您可以尝试以下方法。

DECLARE @SQL AS NVARCHAR(MAX)

SELECT
    @SQL = COALESCE(@SQL, N'') + CASE WHEN @SQL IS NULL THEN c.name ELSE N', ' + c.name END
FROM
    sys.columns AS c INNER JOIN sys.objects AS o
        ON
            c.object_id = o.object_id
WHERE
    o.name = @table
ORDER BY
    c.column_id

SET @SQL = N'SELECT ' + @SQL +  N' INTO 01Parents FROM Customer INNER JOIN ON Customer.[Key] = Location.[Key]'

EXEC sp_executesql @sql
于 2013-01-18T19:58:47.693 回答