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mysql>use mysql;
mysql>select 'host' from user where user='root';
mysql>update user set host = '%' where user ='root';
mysql>flush privileges;
mysql>select 'host'   from user where user='root';
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mysql forige key


Love in coding...
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Here is a simple example that relates parent and child tables through a single-column foreign key:
CREATE TABLE parent (id INT NOT NULL,
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| Database | +----------+ | mysql |
| test | +----------+ 3 rows in set (0.00 sec)
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