Question

我有列表：[1959]，[1960]，[1961] ... [2016]

我写了一个查询：

DECLARE @cnt INT = 1959;

WHILE @cnt < 2017
BEGIN
    DECLARE @sql NVARCHAR(1000)

    SET @sql = 'SELECT @cnt as ''Year'', DC.[Code], PT.[Country Name], PT.[@colname] as ''totalGDP'', PG.[@colname] as ''growthGDP''
        FROM [dbo].[GDP] PT
        INNER JOIN [dbo].[GDPgrowth] PG ON PT.[Country Name]=PG.[Country Name]
        INNER JOIN [dbo].[Dictionary] DC ON PT.[Country Name]=DC.[Country]'

    SET @sql = REPLACE(@sql, '@colname', CAST(@cnt AS VARCHAR(255)));

    EXEC(@sql);

    SET @cnt = @cnt + 1;
END;

但出了点问题，我收到了一个错误：

Msg 137，Level 15，State 2，Line 7
必须声明标量变量＆＃34; @ cnt＆＃34;

有什么问题，我该如何解决？

Answer 1

您可以将其作为参数传递。而不是exec sp_executesql @sql, N'@cnt int', @cnt=@cnt，请使用：

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SQL循环和exec查询 - 必须声明标量变量

1 个答案: