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在Oracle中,面对已经被禁用的外键,我们该如何将它重新启用呢?本教程就为大家带来Oracle外键启用方法。 外键启用语法 ALTER TABLE table_name ENABLE CONSTRAINT constraint_name;...
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我们创建外键后,可能有时会遇到要禁用外键的情况,那么在Oracle中,我们如何对外键进行禁用呢? 语法 在Oracle中,我们要禁用外键可以使用以下语法: ALTER TABLE table_name DISABLE CONSTRAINT ...
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在Oracle中,如何去删除自己创建的外键呢?本教程就为大家介绍Oracle中删除外键的方法。 在Oracle中,我们可以使用ALTER TABLE语句来对外键进行删除。 语法 ALTER TABLE table_name DROP CON...
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在Oracle中,ROLLBACK语句可以用来撤销当前事务或有问题的事务。本教程就将教大家如何使用ROLLBACK语句。 ROLLBACK语法 ROLLBACK [ WORK ] [ TO [SAVEPOINT] savepoint_nam...
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