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我试过这个查询:在这个国家工作的所有医生都工作的医院的名称是什么。但结果不是我所期望的,并且有语法错误。

我有这些表:

CREATE TABLE Hospital (
    hid INT PRIMARY KEY,
    name VARCHAR(127) UNIQUE,
    country VARCHAR(127),
    area INT
);
CREATE TABLE Doctor (
    ic INT PRIMARY KEY,
    name VARCHAR(127),
    date_of_birth INT,
);
CREATE TABLE Work (
    hid INT,
    ic INT,
    since INT,
    FOREIGN KEY (hid) REFERENCES Hospital (hid),
    FOREIGN KEY (ic) REFERENCES Doctor (ic),
    PRIMARY KEY (hid,ic)
);

我试过这个:

SELECT DISTINCT H.name
FROM Hospital H, Doctor D, Work W
WHERE H.hid = W.hid 
AND   D.ic = W.ic 
AND NOT EXISTS (SELECT DISTINCT H2.name 
                FROM Hospital H2
                WHERE H2.country = H.country AND W.hid = H2.hid AND D.ic != W.ic)

我当时的想法是在同一个国家寻找一家医院 H2,但医生 D 不工作。

谢谢。

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