Sql '；预期EOS'；在条件语句下

MS SQL Server在从CASE开始的条件语句下告诉我“预期EOS”。 有人能找出这个代码的错误吗

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如前面的注释所示，

大小写

语法不正确。您还可以将乘法移到

大小写

表达式之外。要获得可运行的查询，还缺少一个

grouping

子句来处理跨

goal

列的聚合（

AVG（）

）

SELECT goal,
       AVG(
       case currency
          when 'GBP' then 1.3
          when 'CAD' then 0.76
          when 'AUD' then 0.71
          ...
          else 1
        end * goal) AS goal_currency_uniformed,
       AVG(pledged) AS avg_num_pledged, 
       AVG(backers) AS avg_num_backers
FROM kickstarter
GROUP BY goal;

请考虑将汇率移动到单独的表中。这将允许您将此查询缩小一点，并具有额外的优势，即您可以在不修改代码的情况下更新汇率

SELECT ks.goal,
       AVG(er.rate * ks.goal) as goal_currency_uniformed,
       AVG(pledged) AS avg_num_pledged, 
       AVG(backers) AS avg_num_backers
FROM kickstarter ks
JOIN exchangerates er ON er.currency = ks.currency
GROUP BY goal;

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查看所有操作。

语法是当[condition]然后[expression]{ELSE expression}结束时的

大小写

您的汇率应该在单独的表中，而不是硬编码到查询中。欢迎您！如果这就完成了你的问题，那么你可以正式地“接受”答案，从一大堆“未回答的问题”中删除你的问题。

SELECT ks.goal,
       AVG(er.rate * ks.goal) as goal_currency_uniformed,
       AVG(pledged) AS avg_num_pledged, 
       AVG(backers) AS avg_num_backers
FROM kickstarter ks
JOIN exchangerates er ON er.currency = ks.currency
GROUP BY goal;