DELETE FROM ...报告在或接近“。”的语法错误。 [英] DELETE FROM ... reporting syntax error at or near "."

问题描述

我试图从我的数据库只删除一个数据，但是，当我写的命令，我不断得到有一些语法错误，你能告诉我在哪里的错误吗？

I'm trying to delete just one data from my DB, but, when I write the command I keep getting that there's some syntax error, could you tell me where is the error?

这是我试过的命令：

DELETE FROM database_userprofile WHERE user.username = 'some';
ERROR:  syntax error at or near "."
LINE 1: DELETE FROM database_userprofile WHERE user.username = 'some'...

DELETE FROM database_userprofile USING database_user WHERE user.username="some";
ERROR:  syntax error at or near "."
LINE 1: ... database_userprofile USING database_user WHERE user.username=...

希望你能帮助我。

推荐答案

您的查询没有任何意义。

Your query doesn't make any sense.

DELETE FROM database_userprofile WHERE user.username = 'some';
                                       ^^^^

用户 c $ c>来自？它不在查询中引用。是 database_userprofile 的列吗？如果是这样，你不能写 user.username （除非是一个复合类型，在这种情况下你必须写（user）.username

Where'd user come from? It isn't referenced in the query. Is it a column of database_userprofile? If so, you can't write user.username (unless it's a composite type, in which case you would have to write (user).username to tell the parser that; but I doubt it's a composite type).

直接的原因是 user 是一个保留字 。您不能使用该名称而不引用它：

The immediate cause is that user is a reserved word. You can't use that name without quoting it:

DELETE FROM database_userprofile WHERE "user".username = 'some';

...但是，这个查询还是没有意义，它会给出一个不同的错误：

... however, this query still makes no sense, it'll just give a different error:

regress=> DELETE FROM database_userprofile WHERE "user".username = 'some';
ERROR:  missing FROM-clause entry for table "user"
LINE 1: DELETE FROM database_userprofile WHERE "user".username = 'so...

我的猜想是你试图做一个删除连接。我假设你有如下的表：

My wild guess is that you're trying to do a delete over a join. I'm assuming that you have tables like:

CREATE TABLE "user" (
    id serial primary key,
    username text not null,
    -- blah blah
);

CREATE TABLE database_userprofile (
     user_id integer references "user"(id),
     -- blah blah
);

并且您尝试使用其他表格中的条件删除。

and you're trying to do delete with a condition across the other table.

如果是这样，您不能只写 user.username 。您必须使用：

If so, you can't just write user.username. You must use:

DELETE FROM database_userprofile
USING "user"
WHERE database_userprofile.user_id = "user".id
AND "user".username = 'fred';

你会注意到我双引号的user。这是因为它是一个关键字，不应真正用于表名或其他用户定义的标识符。双引号将它强制作为标识符而不是关键字。

You'll notice that I've double-quoted "user". That's because it's a keyword and shouldn't really be used for table names or other user defined identifiers. Double-quoting it forces it to be intepreted as an identifier not a keyword.

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