While a primary key may exist on its own, a foreign key must always reference to a primary key somewhere. The original table containing the primary key is the parent table (also known as referenced table). This key can be referenced by multiple foreign keys from other tables, known as “...
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Foreign key constraints prevent invalid data from being placed into the foreign key column because the data must be one of the values contained in the table where it's directed. A foreign key constraint links a column in one table to a column in another and prevents actions that would destro...
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First remember a Foreign key simply requires that the value in that field must exist first in a different table (the parent table). That is all an FK is by definition. Null by definition is not a value. Null means that we do not yet know what the value is. Let me give you a ...
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MySQL Workbench添加外键到EER时出现selected column address must be indexed and be of a compatible type,程序员大本营,技术文章内容聚合第一站。
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