MySQL 5.5案例不正確的語法

Question

嘿我不能得到這個case語句的工作，會有人介意告訴什麼是錯誤的語法是。

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 

確切的錯誤是：

1064 - 你在你的SQL語法錯誤; 'CASE WHEN standards.assessment = 1 THEN'External'ELSE'內部的'END CASE FR'在第3行

Answer 1

有一個語法錯誤與你如何結束你的情況。您需要在結束案例時提供別名。

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

你已經錯過了standards.assessment和CASE