PostgreSQL报SELECT rule‘s target entry X has different type from column “XXX“

Meta392026-09-10 15:47

执行SQL

sql 复制代码

ALTER TABLE "db_name"."table_name" ADD COLUMN "column_name" VARCHAR (50);
COMMENT ON COLUMN "db_name"."table_name"."column_name" IS '测试';

报错：

shell 复制代码

SELECT rule's target entry X has different type from column "XXX"

例如：SELECT rule's target entry 20 has different type from column "doctorname"

就是包含doctorname别名的视图有问题

解决方案：

sql 复制代码

-- 查找所有依赖 doctorname 列的视图
SELECT 
    n.nspname AS schema_name,
    c.relname AS view_name,
    pg_get_viewdef(c.oid) AS view_definition
FROM 
    pg_class c
JOIN 
    pg_namespace n ON n.oid = c.relnamespace
WHERE 
    c.relkind = 'v'  -- 只查视图
    AND pg_get_viewdef(c.oid) LIKE '%doctorname%'
    AND c.relname NOT LIKE 'pg_%';  -- 排除系统视图

如果上面的没查到视图，再用下面这个查，如果上面查到了，下面就不用了。

sql 复制代码

-- 查找所有依赖 doctorname 列的规则（包括 ON SELECT 规则）
SELECT 
    n.nspname AS schema_name,
    c.relname AS table_name,
    r.rulename AS rule_name,
    pg_get_ruledef(r.oid) AS rule_definition
FROM 
    pg_rewrite r
JOIN 
    pg_class c ON c.oid = r.ev_class
JOIN 
    pg_namespace n ON n.oid = c.relnamespace
WHERE 
    pg_get_ruledef(r.oid) LIKE '%doctorname%'
    AND r.rulename != '_RETURN';  -- 排除视图的隐含规则（如果你已在视图中查到，可以不用查这个）

例如：我这里查到了这3个视图包含doctorname，则把这三个视图备份，删除，重新创建。然后再执行ALTER TABLE操作即可。