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This article mainly introduces how to solve the mysql query character set mismatch problem, the article is very detailed, has a certain reference value, interested friends must read it!

Sometimes the MySQL database uses the latin character set when building the table, while the query in the web page is utf-8. When the input page is typed in Chinese, and then queried in the database, it will report the error of ER_CANT_AGGREGATE_2COLLATIONS: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation'=', so the database is found in stackover flow. And the method of changing the character set in the data table.

SET collation_connection = 'utf8_general_ci'

Note: to replace the following two sentences with your database name and your data table name

ALTER DATABASE your_database_name CHARACTER SET utf8 COLLATE utf8_general_ci ALTER TABLE your_table_name CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci

This ensures that the database is also a utf-8 character set, so that there will be no errors in querying the contents of the database when typing in Chinese.

Reference:Illegal mix of collations MySQL Error

Set the character set of the database to utf-8 in PHP

Mysqli_set_charset ($dbc,'utf8')

Just add a meta that displays utf-8 to html.

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