在 Postgres 中更改 table 查询

Question

我正在尝试将 table 中一列的数据类型从 biginteger 更改为 varchar。

myproject-# \d+ product_awbstock
                         Table "public.product_awbstock"
      Column       |           Type           | Modifiers | Storage | Description 
-------------------+--------------------------+-----------+---------+-------------
 airwaybill_number | bigint                   | not null  | plain   | 
 used              | boolean                  | not null  | plain   | 
 created           | timestamp with time zone | not null  | plain   | 
 modified          | timestamp with time zone | not null  | plain   | 
Indexes:
    "product_awbstock_pkey" PRIMARY KEY, btree (airwaybill_number)
    "product_awbstock_used" btree (used)

我正在使用这个查询，同样报错。

alter table product_awbstock ALTER  COLUMN airwaybill_number TYPE varchar(15);

ERROR: foreign key constraint "awbstock_id_refs_airwaybill_number_d438187b" cannot be implemented

DETAIL: Key columns "awbstock_id" and "airwaybill_number" are of incompatible types: bigint and character varying.

Answer 1

你应该：

在第一个 table

ALTER TABLE product_awbstock DROP CONSTRAINT product_awbstock_pkey;

删除第二个外键约束 table

ALTER TABLE ??? DROP CONSTRAINT awbstock_id_refs_airwaybill_number_d438187b;

更改两个 tables

ALTER TABLE product_awbstock ALTER COLUMN airwaybill_number TYPE varchar(15);

ALTER TABLE ??? ALTER COLUMN airwaybill_id TYPE varchar(15);

重新创建以前删除的约束

ALTER TABLE product_awbstock ADD CONSTRAINT product_awbstock_pkey PRIMARY KEY (airwaybill_number);

ALTER TABLE ??? ADD CONSTRAINT awbstock_id_refs_airwaybill_number_d438187b FOREIGN KEY (awbstock_id) REFERENCES product_awbstock (airwaybill_number);

在 Postgres 中更改 table 查询

ALTER table query in Postgres

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