mysql - 错误代码:1265。列的数据被截断
问题描述
我有一个名为 pt_products 的表,其中包含以下字段
id int(11) NO PRI auto_increment
merchant varchar(64) NO MUL
filename varchar(255) NO MUL
name varchar(255) NO MUL
description text NO
image_url varchar(255) NO
buy_url text NO
price decimal(10,2) NO 0.00
category varchar(64) NO MUL
brand varchar(64) NO MUL
rating int(11) NO 0
reviews int(11) NO 0
search_name varchar(255) NO MUL
normalised_name varchar(255) NO MUL
original_name varchar(255) NO
voucher_code varchar(255) NO
categoryid int(11) NO 0
dupe_hash varchar(32) NO UNI
ean varchar(255) NO MUL 0
asin char(10) NO
Amazon_Top_Sales bigint(7) NO 0
availability varchar(255) NO
mpn varchar(255) NO MUL
delivery_cost decimal(10,2) NO 0.00
我创建了一个新表
create table graph (
id int primary key auto_increment,
ean varchar(255) unsigned not null,
avg_price decimal(10,2) not null,
created_at timestamp default current_timestamp
);
然后,我想将表 pt_products 中的字段插入到上面创建的图表中
insert into graph(ean, avg_price)
select ean, avg(price) avg_price
from pt_products
group by ean;
那就是我收到错误的时候
4566 row(s) affected, 64 warning(s): 1265 Data truncated for column 'avg_price' at row 8438 1265 Data truncated for column 'avg_price' at row 8439 1265 Data truncated for column 'avg_price' at row 8440 1265 Data truncated for column 'avg_price' at row 9235 1265 Data truncated for column 'avg_price' at row 9300 1265 Data truncated for column 'avg_price' at row 9333 1265 Data truncated for column 'avg_price' at row 9337 1265 Data truncated for column 'avg_price' at row 9338 1265 Data truncated for column 'avg_price' at row 9339 1265 Data truncated for column 'avg_price' at row 9341 1265 Data truncated for column 'avg_price' at row 9369 1265 Data truncated for column 'avg_price' at row 9370 1265 Data truncated for column 'avg_price' at row 9371 1265 Data truncated for column 'avg_price' at row 9375 1265 Data truncated for column 'avg_price' at row 9376 1265 Data truncated for column 'avg_price' at row 9382 1265 Data truncated for column 'avg_price' at row 9385 1265 Data truncated for column 'avg_price' at row 9386 1265 Data truncated for column 'avg_price' at row 9389 1265 Data truncated for column 'avg_price' at row 9393 1265 Data truncated for column 'avg_price' at row 9401 1265 Data truncated for column 'avg_price' at row 9459 1265 Data truncated for column 'avg_price' at row 9460 1265 Data truncated for column 'avg_price' at row 9532 1265 Data truncated for column 'avg_price' at row 9596 1265 Data truncated for column 'avg_price' at row 9608 1265 Data truncated for column 'avg_price' at row 9617 1265 Data truncated for column 'avg_price' at row 9618 1265 Data truncated for column 'avg_price' at row 9626 1265 Data truncated for column 'avg_price' at row 9669 1265 Data truncated for column 'avg_price' at row 9675 1265 Data truncated for column 'avg_price' at row 9677 1265 Data truncated for column 'avg_price' at row 9678 1265 Data truncated for column 'avg_price' at row 9680 1265 Data truncated for column 'avg_price' at row 9683 1265 Data truncated for column 'avg_price' at row 9695 1265 Data truncated for column 'avg_price' at row 9710 1265 Data truncated for column 'avg_price' at row 9711 1265 Data truncated for column 'avg_price' at row 9739 1265 Data truncated for column 'avg_price' at row 9759 1265 Data truncated for column 'avg_price' at row 9760 1265 Data truncated for column 'avg_price' at row 9768 1265 Data truncated for column 'avg_price' at row 9775 1265 Data truncated for column 'avg_price' at row 9777 1265 Data truncated for column 'avg_price' at row 9780 1265 Data truncated for column 'avg_price' at row 9789 1265 Data truncated for column 'avg_price' at row 9797 1265 Data truncated for column 'avg_price' at row 9829 1265 Data truncated for column 'avg_price' at row 9856 1265 Data truncated for column 'avg_price' at row 9874 1265 Data truncated for column 'avg_price' at row 9897 1265 Data truncated for column 'avg_price' at row 9902 1265 Data truncated for column 'avg_price' at row 9917 1265 Data truncated for column 'avg_price' at row 9936 1265 Data truncated for column 'avg_price' at row 9949 1265 Data truncated for column 'avg_price' at row 9961 1265 Data truncated for column 'avg_price' at row 9976 1265 Data truncated for column 'avg_price' at row 9985 1265 Data truncated for column 'avg_price' at row 9991 1265 Data truncated for column 'avg_price' at row 9995 1265 Data truncated for column 'avg_price' at row 10003 1265 Data truncated for column 'avg_price' at row 10005 1265 Data truncated for column 'avg_price' at row 10007 1265 Data truncated for column 'avg_price' at row 10010 Records: 4566 Duplicates: 0 Warnings: 215
价格字段是
price decimal(10,2)
和目标表图中的 avg_price 相同。
avg_price decimal(10,2) not null,
数据不应该在那里吗?
我试图将 avg_price 从图表更改为小数(20,4),但没有成功。
我真的看不到发生了什么。
示例测试在这里
谢谢
解决方案
The AVG()
function on a NUMERIC(10,2) column like your price
column produces a result with the type NUMERIC(14,6).
Demo:
mysql> create table t ( price numeric(10,2));
mysql> create table t2 as select avg(price) avg_price from t;
mysql> show create table t2\G
*************************** 1. row ***************************
Table: t2
Create Table: CREATE TABLE `t2` (
`avg_price` decimal(14,6) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
(NUMERIC and DECIMAL are synonyms.)
When you try to stuff values with six digits of scale into a column with two digits of scale, MySQL must assume that it's possible that it will lose some information along the way.
Demo: Storing a number with two digits of scale is okay, and causes no warnings:
mysql> insert into t select 3.14;
Query OK, 1 row affected (0.01 sec)
Records: 1 Duplicates: 0 Warnings: 0
But a number with greater scale results in a warning:
mysql> insert into t select 3.1415927;
Query OK, 1 row affected, 1 warning (0.01 sec)
Records: 1 Duplicates: 0 Warnings: 1
mysql> show warnings;
+-------+------+--------------------------------------------+
| Level | Code | Message |
+-------+------+--------------------------------------------+
| Note | 1265 | Data truncated for column 'price' at row 1 |
+-------+------+--------------------------------------------+
1 row in set (0.00 sec)
You can explicitly cast the numeric expression to the same data type, to avoid the warning:
mysql> insert into t select cast(3.1415927 as decimal(10,2));
Query OK, 1 row affected (0.01 sec)
Records: 1 Duplicates: 0 Warnings: 0
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