MySQL多表关联数据同时删除sql语句 有需要的朋友可参考。
DELETE删除多表数据，怎样才能同时删除多个关联表的数据呢？这里做了深入的解释：
| 代码如下 | 复制代码 |
| 1 delete from t1 where 条件 2 delete t1 from t1 where 条件 3 delete t1 from t1,t2 where 条件 4 delete t1,t2 from t1,t2 where 条件 |
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category（栏目信息表）和news（新闻数据表）。
category中的id（栏目编号）字段作为该表的主键（primary key）.唯一标识了一个栏目的信息。
news 中的id字段作为该表的主键（primary key）.唯一标识了一个栏目的信息。
category_id（栏目编号）字段与category表的id字段相关联。
1.SQL删除语句
| 代码如下 | 复制代码 | ||||
delete category,news from category left join news on category.id = news.category_id |
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| 代码如下 | 复制代码 |
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DELETE t1 FROM t1,t2 WHERE t1.id=t2.id 或 DELETE FROM t1 USING t1,t2 WHERE t1.id=t2.id |
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| 代码如下 | 复制代码 |
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DELETE t1 FROM t1,t2 WHERE t1.id=t2.id 或 DELETE FROM t1 USING t1,t2 WHERE t1.id=t2.id |
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| 代码如下 | 复制代码 |
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DELETE t1 FROM t1 LEFT JOIN T2 ON t1.id=t2.id WHERE t2.id IS NULL 或 DELETE FROM t1,USING t1 LEFT JOIN T2 ON t1.id=t2.id WHERE t2.id IS NULL |
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2、从数据表t1里在数据表t2里没有匹配的记录查找出来并删除掉1
| 代码如下 | 复制代码 |
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DELETE t1 FROM t1 LEFT JOIN T2 ON t1.id=t2.id WHERE t2.id IS NULL 或 DELETE FROM t1,USING t1 LEFT JOIN T2 ON t1.id=t2.id WHERE t2.id IS NULL |
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| 代码如下 | 复制代码 |
| DELETE t1,t2 from t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t1.id=25 | |
3、 从两个表中找出相同记录的数据并把两个表中的数据都删除掉1
| 代码如下 | 复制代码 |
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delete t1,t2 from table_name as t1 left join table2_name as t2 on t1.id=t2.id where table_name.id=25 |
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| 代码如下 | 复制代码 |
| delete t1,t2 from table_name as t1 left join table2_name as t2 on t1.id=t2.id where table_name.id=25 | |
在数据里面执行是错误的（MYSQL 版本不小于5.0在5.0中是可以的）
上述语句改 写成1
| 代码如下 | 复制代码 | ||||
delete table_name,table2_name from table_name as t1 left join table2_name as t2 on t1.id=t2.id where table_name.id=25
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