Question

update table1 set column2 = max_value + sum;

获取错误：错误：运算符不存在：字符变化= 整数。

此外，当我尝试运行以下代码时：

{
"error": {
    "errors": [
        {
            "domain": "global",
            "reason": "notFound",
            "message": "Not Found"
        }
       ],
    "code": 404,
    "message": "Not Found"
    }
}

我收到另一个错误：

“错误：列”max_value“不存在”

Answer 1

您可以使用：

CREATE OR REPLACE FUNCTION maxvaloftable ()
 RETURNS integer AS
$BODY$

   DECLARE

resultat integer = 2;

BEGIN

resultat= (SELECT MAX(sum) FROM  table) ;

RETURN resultat;
END;
$BODY$
 LANGUAGE plpgsql VOLATILE STRICT
    COST 100;
ALTER FUNCTION maxvaloftable()
 OWNER TO postgres;

update table1 set column2 = (select  maxvaloftable ()) + sum;

如何动态选择查询

1 个答案: