MySQL 5.5 大小写不正确的语法

Question

嘿，我无法让这个 case 语句起作用，有人介意告诉我语法有什么问题吗？

SELECT standards.standard_id, standards.title, standards.level,standards.credits, SUM(standards.credits), standards.assessment 

CASE  WHEN standards.assessment = 1 THEN 'External' ELSE 'Internal' END CASE
FROM standards JOIN courses_standards ON standards.standard_id = courses_standards.standard_id 
WHERE courses_standards.course_id = 1

准确的错误是：

1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CASE WHEN standards.assessment = 1 THEN 'External' ELSE 'Internal' END CASE FR' at line 3

Answer 1

您结束案件的方式存在语法错误。您需要在结束案例时提供别名。

SELECT standards.standard_id, standards.title, standards.level,standards.credits, SUM(    standards.credits), standards.assessment, 

CASE  WHEN standards.assessment = 1 THEN 'External' ELSE 'Internal' END assessment
FROM standards JOIN courses_standards ON standards.standard_id = courses_standards.    standard_id 
WHERE courses_standards.course_id = 1

Answer 2

您在 standards.assessment 和 CASE

之间漏掉了一个逗号

MySQL 5.5 大小写不正确的语法

MySQL 5.5 Case incorrect syntax

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