列“xxxx"的默认值无法在 Postgres DB 中自动转换为类型 boolean [英] default for column "xxxx" cannot be cast automatically to type boolean in Postgres DB

问题描述

我正在尝试将 brs.parts 表中的一列从字符更改为布尔值.到目前为止，该列的数据为 Y/N.我正在使用以下命令

I am trying to update a column in brs.parts table from character varying to boolean. The column has data as Y/N till now. I am using the below command

ALTER TABLE brs.parts ALTER COLUMN is_dpm_scanned TYPE BOOLEAN USING is_dpm_scanned::BOOLEAN

<小时>

但我收到以下错误:

---

But I am getting the following error:

********* 错误 *********

********* Error **********

ERROR: default for column "is_dpm_scanned" cannot be cast automatically to type boolean
SQL state: 42804

<小时>

表定义为:

---

The table definition was:

CREATE TABLE brs.parts (
    id serial NOT NULL PRIMARY KEY,
    webcrt_part_id INTEGER,
    event_id INTEGER,
    webcrt_job_id INTEGER,
    incoming_serial_number CHARACTER VARYING(256),
    outgoing_serial_number CHARACTER VARYING(256), 
    part_number CHARACTER VARYING(256),
    tag_number NUMERIC,
    is_dpm_scanned CHARACTER VARYING(1) DEFAULT 'N'::CHARACTER VARYING,
    current_operation_id INTEGER,
    creation_date DATE,
    created_by CHARACTER VARYING(20) NOT NULL,
    last_updated_date DATE,
    last_updated_by CHARACTER VARYING(20) NOT NULL,
    is_delete CHARACTER VARYING(1) DEFAULT 'N'::CHARACTER VARYING
);

推荐答案

在更改类型之前，您必须删除默认约束:

You have to drop default constraint before changing the type:

ALTER TABLE parts 
    ALTER COLUMN is_dpm_scanned DROP DEFAULT,
    ALTER COLUMN is_dpm_scanned TYPE BOOLEAN USING is_dpm_scanned::BOOLEAN,
    ALTER COLUMN is_dpm_scanned SET DEFAULT FALSE;

另见:在 postgresql 中将列从字符串更改为字符串数组.

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