MySQL add foreign key completion constraint for table error can ' t create table ' Sfkbbs. #sql -513_25 ' (errno:150)

Code

Alter Table Add constraint   
Foreign Key References
 on Delete Restrict  on Update Restrict;

(constraint can be appended with the constraint name)

The reason for the error is that the IDs of the previous two tables are of different types, one when int, and one when bigint

Workaround when modifying the table,

Alter Table bigint;

You can change it after that.

Here is some information about MySQL

ALTER [ONLINE | OFFLINE] [IGNORE] TABLE tbl_name
[Alter_specification [, Alter_specification] ...]
[Partition_options]

ADD [CONSTRAINT [symbol]]
FOREIGN KEY [index_name] (Index_col_name,...)
Reference_definition

Topic:constraint
SQL supports foreign keys, which let you cross-reference related data across tables, and foreign key constraints, which he LP Keep this spread-out data consistent. The essential syntax for a FOREIGN KEY constraint definition in a CREATE TABLE or ALTER table statement looks like this:
[CONSTRAINT [Symbol]] FOREIGN KEY
[Index_name] (Index_col_name, ...)
REFERENCES tbl_name (Index_col_name,...)
[on DELETE Reference_option]
[on UPDATE Reference_option]

Reference_option:
RESTRICT | CASCADE | SET NULL | NO ACTION

See Also:online Help Create-table-foreign-keys

MySQL add foreign key completion constraint for table error can ' t create table ' Sfkbbs. #sql -513_25 ' (errno:150)