Question

在我的JPA模型中有3个表A，B，C。

我的查询是：

SELECT a FROM A a
WHERE EXISTS (
    SELECT c from C c LEFT JOIN B b"
    ON c = b.c AND b.a = a
    WHERE c.date BETWEEN CURRENT_TIMESTAMP AND :pUntil AND b.a IS NULL
)

背景是我希望A中所有没有b的条目的实体在将来链接到事件C。

问题是我得到Column 'T0.ID' is either not in any table in the FROM list or appears within a join specification and is outside the scope of the join specification or ...

修改：将其视为A是用户表，C是事件，B存储事件用户的注册。我希望获得所有用户，这些用户在参数pUntil之前尚未注册所有未来事件。

Answer 1

虽然我同意Neil，但我通过更改查询来解决此问题。这是新查询：

SELECT a FROM A a
WHERE EXISTS (
    SELECT c from C c
    WHERE c.date BETWEEN CURRENT_TIMESTAMP AND :pUntil
    AND NOT EXISTS (
        SELECT b from B b
        WHERE b.c= c and b.a = a
    )
)

JPQL：访问子查询的JOIN中的外部属性

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