Question

有人能告诉我为什么这不起作用吗？

INSERT INTO Medical_History (pid, grafts, allergies,  diseases, surgearies, treatment)
VALUES ((SELECT pid FROM Pet WHERE pet_name='Jack' AND cid=(SELECT cid FROM Customer WHERE last_name='Iwannidis' AND first_name='Giwrgos')),
       'grafts', 'allergies', 'diseases', 'surgearies', treatments');

我收到语法错误：

unrecognized token "');"

Answer 1

select语句中嵌套的values看起来不对（我不确定所有数据库都接受它）。更典型的表达方式是：

INSERT INTO Medical_History (pid, grafts, allergies,  diseases, surgearies, treatment)
    SELECT pid, 'grafts', 'allergies', 'diseases', 'surgearies', 'treatments'
    FROM Pet
    WHERE pet_name='Jack' AND
          cid=(SELECT cid
               FROM Customer
               WHERE last_name='Iwannidis' AND first_name='Giwrgos'
              );

如果子查询返回多个值，这一点尤为重要。然后查询可能会出错。

Answer 2

我遇到语法错误，因为我忘记了'治疗'上的引号（'）。

在INSERT sql语句中嵌套SELECT

2 个答案: