


An article explaining in detail the error reporting problem of MySQL setting only_full_group_by
The development environment is connected to mysql5.6
, while the test environment is mysql5.7
. During development, a friend wrote a sql
statement about group by
. It runs normally in the development environment, but exceptions are found in the test environment.
Cause analysis: MySQL5.7
version has the mysql sql_mode = only_full_group_by
attribute set by default, causing an error.
ONLY_FULL_GROUP_BY
is the culprit causing this error. In this strict mode, for the group by
aggregation operation, if in select## If the columns in # do not appear in
group by, then this
SQL is illegal. Because in the
sql written by the developer, the
select column is not in the
group by clause, and an error will be reported when using
group by.
mysql5.7.x. The
only_full_group_by mode is enabled by default.
1. Check sql_mode
SELECT` `@@sql_mode;
2. Remove ONLY_FULL_GROUP_BY and reset the value.
SET` `@@``global``.sql_mode =``'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'``;
For existing databases, you need to execute it under the corresponding data
SET` `sql_mode =``'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'``;
Find the configuration file of
MySQL, in the /etc/my.cnf
file on the linux
system, query sql_mode
field, I did not find this keyword in the configuration file, so I added it manually: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">sql_mode = STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION</pre><div class="contentsignin">Copy after login</div></div>
One thing to note is that it must be added in the
configuration, like this After adding, restart mysql
for it to take effect. Exit the database: exit, restart command: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">service mysqld restart
#lnmp重启mysql
lnmp restart mysql</pre><div class="contentsignin">Copy after login</div></div>
Refresh the page and the error message disappears. It is successfully resolved. Connect to the database again to view
Configurationselect @@sql_mode
:
This ends this article aboutMysql5 .7
and above versionONLY_FULL_GROUP_BY
This article introduces the error solution, more related Mysql5.7 ONLY_FULL_GROUP_BY
## is as follows For the meaning of common values of sql_mode, refer to:
ONLY_FULL_GROUP_BY: For GROUP BY aggregation operation, if the column in SELECT does not appear in GROUP BY, then this SQL is illegal because the column Not in the GROUP BY clause
NO_AUTO_VALUE_ON_ZERO: This value affects the insertion of auto-growing columns. Under the default settings, inserting 0 or NULL represents generating the next auto-increasing value. This option is useful if the user wants to insert a value of 0 and the column is auto-increasing. STRICT_TRANS_TABLES: In this mode, if a value cannot be inserted into a transaction table, the current operation will be interrupted, and there will be no restriction on non-transaction tables. NO_ZERO_IN_DATE: In strict mode, Zero dates and months are not allowedNO_ZERO_DATE: Set this value, the mysql database does not allow the insertion of zero dates, and inserting zero dates will throw an error instead of a warning. ERROR_FOR_DIVISION_BY_ZERO: During the INSERT or UPDATE process, if the data is divided by zero, an error is generated instead of a warning. If the mode is not given, MySQL returns NULL when the data is divided by zeroNO_AUTO_CREATE_USER: Disables GRANT from creating users with empty passwordsNO_ENGINE_SUBSTITUTION: If the required storage engine is disabled or not compiled , then an error is thrown. When this value is not set, the default storage engine is used instead and an exception is thrown. PIPES_AS_CONCAT: Treat "||" as a string connection operator instead of an OR operator, which is the same as the Oracle database Similarly, it is similar to the string concatenation function ConcatANSI_QUOTES: After enabling ANSI_QUOTES, double quotes cannot be used to quote the string because it is interpreted as an identifier. Recommended learning: "MySQL Video Tutorial
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