postgresql 在 postgres 中如何向现有表添加索引?

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时间:2020-10-21 00:04:26  来源:igfitidea点击:

In postgres how do I add index to existing table?

postgresqlindexing

提问by user1467855

In postgres how do I add index to existing table?

在 postgres 中如何向现有表添加索引?

I tried following but it's not working:

我尝试了以下但它不起作用:

CREATE INDEX my_index ON my_table USING btree(a_column);

and then this:

然后这个:

CREATE INDEX my_index ON my_table USING btree(a_column);

But neither works.

但两者都不起作用。

I am using ant to do a db migration. And when I do ant db-migrate-apply-postgresqlI keep getting the error

我正在使用 ant 进行数据库迁移。当我这样做时,ant db-migrate-apply-postgresql我不断收到错误消息

 [echo] ERROR:  relation "my_index" already exists

回答by a_horse_with_no_name

Well, this error message:

嗯,这个错误信息:

ERROR: relation "my_index" already exists

错误:关系“my_index”已经存在

is pretty clear, isn't it.

很清楚,不是吗。

You are trying to create an index with the name of an existing index or table. You need to use a different name.

您正在尝试使用现有索引或表的名称创建索引。您需要使用不同的名称。