目录1. 内连接（INNER JOIN）2. 左外连接（LEFT JOIN）3. 右外连接（RIGHT JOIN）4. 全外连接（FULL JOIN）5. 交叉连接（CROSS JOIN）6. 自连接（SELF JOIN）7. 左外连接排除内连接8.
i have stored the txtfile in the database.i need to show the txtfile when i clik the link. and this link has to be created dynamically.
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