我的数据不在数据库中获取

Question

My problem is that these query always run on my local server but not don't run online.

SELECT order_number, max(cart_datetime) maxdate, sum(cart_total), cart_u_id
FROM addtocart_2
WHERE cart_u_id ='$_SESSION[UserId]'
GROUP BY cart_datetime desc limit 1

Online server showing on this line below:

1140 - In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'gloriast_gloria.addtocart_2.order_number'; this is incompatible with sql_mode=only_full_group_by

Answer 1

In the text exception raised by MYSQL you have the answer :-)

this is incompatible with sql_mode=only_full_group_by

In your local DB, you have set different mode. Please refer to MySQL documentation to change that: https://dev.mysql.com/doc/refman/8.0/en/group-by-handling.html https://dev.mysql.com/doc/refman/8.0/en/sql-mode.html

Answer 2

It seems like your server's mysql has ONLY_FULL_GROUP_BY enabled.

You can disable it by running the following query in your server.

SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

Then your query should work. If you want to know why it happens, refer to the mysql documentation.

https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html

It explains how and why this happens and how to solve this :)

Hope it helps.