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ERROR 1215 (HY000): Cannot add foreign key constraint
2022-06-11 06:10:00 【Glutinous rice balls】
The cause of this error may be ：
A Table main construction and B Table foreign key data type 、 Inconsistent constraints .
The storage engines of the two data tables are inconsistent .
The character sets of the two tables are inconsistent .
...
My mistake ：
be under construction B Cannot add foreign key while table .
reason ： What I use MySQL The storage engine for version data tables is InnoDB, I changed the storage engine of the main table to MyISAM.
solve ： Just change it back .
The table was built successfully .
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