Question

我有以下Oracle SQL查询。给定给定的名称和姓氏，它以任一顺序查找具有一个名称和另一个名称的初始值的所有记录。我创建了score列，将可能的匹配项放在结果集的顶部。

SELECT
  surname,
  givenname,
  (CASE WHEN surname = 'Smith' THEN 2 ELSE 0)
    + (CASE WHEN givenname = 'John' THEN 1 ELSE 0)
    AS score
FROM person
WHERE (surname = 'Smith' AND givenname LIKE 'J%')
  OR  (surname LIKE 'S%' AND givenname = 'John')
  OR  (surname = 'John' AND givenname LIKE 'S%')
  OR  (surname LIKE 'J%' AND givenname = 'Smith')
ORDER BY
  score DESC,
  surname ASC,
  givenname ASC;

问题是score在+的位置发出错误。 IDE报告：

语法错误，预期：
  /
  *
  |

执行报告：

SQL错误：ORA-00905：缺少关键字

我做错了什么？有没有更好的方法来计算分数？

Answer 1

您错过了END声明中的CASE：

SELECT
  surname,
  givenname,
  (CASE WHEN surname = 'Smith' THEN 2 ELSE 0 END)  -- < add END
    + (CASE WHEN givenname = 'John' THEN 1 ELSE 0 END)  -- < add END
    AS score
FROM person
WHERE (surname = 'Smith' AND givenname LIKE 'J%')
  OR  (surname LIKE 'S%' AND givenname = 'John')
  OR  (surname = 'John' AND givenname LIKE 'S%')
  OR  (surname LIKE 'J%' AND givenname = 'Smith')
ORDER BY
  score DESC,
  surname ASC,
  givenname ASC;

添加CASE语句的结果

1 个答案: