Question

我收到MySQL的错误，这是我见过的最无用的错误消息：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'NOT NULL,
PRIMARY KEY (userID, tweetID),
FOREIGN KEY (userID) REFERENCES User(' at line 4

很好，请查看手册...＆gt; _ _＆gt;

这是SQL源代码;我相信熟悉SQL的人会非常简单，但我是个新手。对我来说一切都很好。

我真的希望有一个比“我的错误是什么”更加完善的问题，但是错误信息如此模糊，而且我的经验很少，我几乎迷失了。

CREATE TABLE User (
    username        VARCHAR(20)     NOT NULL,
    userID          INTEGER         NOT NULL,
    fullName        VARCHAR(100),
    passwordHash    VARCHAR(256)    NOT NULL,
    email           VARCHAR(256)    NOT NULL,
    imageURL        VARCHAR(200),
    facebookURL     VARCHAR(200),
    tagline         VARCHAR(140),
    memberSince     TIMESTAMP       NOT NULL,
    PRIMARY KEY (userID)
);

CREATE TABLE Tweet (
    tweetID INTEGER                 NOT NULL,
    userID INTEGER                  NOT NULL,
    content VARCHAR(140)            NOT NULL,
    TIMESTAMP                       NOT NULL,
    PRIMARY KEY (tweetID),
    FOREIGN KEY (userID) REFERENCES User(userID)
);

CREATE TABLE HashTag (
    tweetID INTEGER                 NOT NULL,
    content VARCHAR(140)            NOT NULL,
    PRIMARY KEY (content),
    FOREIGN KEY (tweetID) REFERENCES Tweet(tweetID)
);

CREATE TABLE Follows (
    follower INTEGER                NOT NULL,
    followee INTEGER                NOT NULL,
    PRIMARY KEY (follower, followee),
    FOREIGN KEY (follower) REFERENCES User(userID),
    FOREIGN KEY (followee) REFERENCES User(userID)
);

CREATE TABLE Retweets (
    tweetID INTEGER                 NOT NULL,
    userID INTEGER                  NOT NULL,
    TIMESTAMP                       NOT NULL,
    PRIMARY KEY (userID, tweetID),
    FOREIGN KEY (userID) REFERENCES User(userID),
    FOREIGN KEY (tweetID) REFERENCES Tweet(tweetID)
);

CREATE TABLE Mentions (
    tweetID INTEGER                 NOT NULL,
    userID INTEGER                  NOT NULL,
    PRIMARY KEY (tweetID, userID),
    FOREIGN KEY (tweetID) REFERENCES Tweet(tweetID),
    FOREIGN KEY (userID) REFERENCES User(userID)
);

CREATE TABLE Favorites (
    tweetID INTEGER                 NOT NULL,
    userID INTEGER                  NOT NULL,
    PRIMARY KEY (tweetID, userID),
    FOREIGN KEY (tweetID) REFERENCES Tweet(tweetID),
    FOREIGN KEY (userID) REFERENCES User(userID)
);

CREATE TABLE CanSee (
    tweetID INTEGER                 NOT NULL,
    userID INTEGER                  NOT NULL,
    PRIMARY KEY (tweetID, userID),
    FOREIGN KEY (tweetID) REFERENCES Tweet(tweetID),
    FOREIGN KEY (userID) REFERENCES User(userID)
);

CREATE TABLE Message (
    messageID INTEGER               NOT NULL,
    senderID INTEGER                NOT NULL,
    receiverID INTEGER              NOT NULL,
    content VARCHAR(140)            NOT NULL,
    TIMESTAMP                       NOT NULL,
    PRIMARY KEY (messageID),
    FOREIGN KEY (senderID) REFERENCES User(userID),
    FOREIGN KEY (receiverID) REFERENCES User(userID)
);

Answer 1

当它显示“NEAR __ ”时，它说的是在该点之前发生的事情触发了错误。

在这种情况下，这就是单词TIMESTAMP。您列出了该列的TIMESTAMP类型，但从未为其命名。也许这应该是modified_on TIMESTAMP（或者那种效果）。

模糊的SQL错误......这里发生了什么？

1 个答案: