命令没有以多个子查询正确结束

Question

SELECT s_fname
FROM (SELECT s_fname from student) as s_n
WHERE s_n like 'Youss%';

我在多个子查询中遇到此错误，但无法正确处理。 ORA-00933: SQL 命令未正确结束

Answer 1

像这样：

SELECT s_fname
FROM (SELECT s_fname from student) s_n
WHERE s_fname like 'Youss%';

或者这样试试：

with (select s_fname from student) as s_n
select s_fname from s_n
where s_fname like 'Youss%';

也就是说，除了作为练习之外，没有实际理由在这里使用子查询。最好只说这个：

select s_fname 
from student 
where s_fname like 'Youss%';

Answer 2

SELECT s_fname
FROM (SELECT s_fname from student) as s_n
WHERE s_n.s_fname like 'Youss%';

您在 table 而不是字段

上使用 WHERE 子句

您也可以在您的特定情况下改为这样写：

SELECT s_n.s_fname
FROM student as s_n
WHERE s_n.s_fname like 'Youss%';

command not properly ended with multiple subqueries