我正在尝试运行 SQL 语句，但出现语法错误

Question

结果：“类型”附近：语法错误 第 2 行：

选择 发票日期， 帐单地址， 比林城, 全部的， 案件 当总计 < 2.00 THEN 'Baseline Purchase' ELSE 'Top Performer' END AS Purchase Type FROM Invoice WHERE Purchase Type = 'Top Performer' ORDER BY BillingCity

Answer 1

列名称或别名中不能有空格，就像

Purchase Type

中那样。您可以使用双引号 (

"

) 转义此名称：

SELECT   InvoiceDate, BillingAddress, BillingCity, total, 
         CASE WHEN total < 2.00 THEN 'Baseline Purchase' 
              ELSE 'Top Performer' 
         END AS "Purchase Type"
         -- Here^-------------^ 
FROM     Invoice 
WHERE    Purchase Type = 'Top Performer'
ORDER BY BillingCity