Oracle Homework - SQL语句错误 - 再次

Question

我不确定为什么会收到此错误，此代码非常简单。错误是：

ORA-00920：无效的关系运算符

代码是：

SELECT FIRST_NAME || ' ' || LAST_NAME AS "EMPLOYEES"
FROM F_STAFFS
WHERE LAST_NAME LIKE 'D%'
AND LAST_NAME LIKE '%a%' AND '%e%';

我正在尝试在标题为“EMPLOYEES”的列中显示名字和姓氏，其中姓氏以“D”开头，姓氏包含字母“a”和“e”。

谢谢！

Answer 1

SELECT FIRST_NAME || ' ' || LAST_NAME AS "EMPLOYEES"
FROM F_STAFFS
WHERE LAST_NAME LIKE 'D%'
AND LAST_NAME LIKE '%a%' AND LAST_NAME LIKE '%e%';

但这可以简化为：

SELECT FIRST_NAME || ' ' || LAST_NAME AS "EMPLOYEES"
FROM F_STAFFS
WHERE LAST_NAME LIKE 'D%a%' AND LAST_NAME LIKE '%e%';

Answer 2

'%e%'不是有效的逻辑表达式。

你需要的是：

AND LAST_NAME LIKE '%a%' AND LAST_NAME LIKE '%e%';