$sql="UPDATE another_table SET value = '$value' WHERE id = 'id'";if($conn->query($sql)===TRUE){ echo"数据更新成功";}else{ echo"Error: ".$sql."<br>".$conn->error;} $conn->close();?> 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 饼状图 30%50%20%饼状图连接数据库选择数据更新数据 希望以上步骤和示例代码能够...
Re: Update from another table where partial string exist in other table Sébastien F. May 27, 2022 04:42PM Re: Update from another table where partial string exist in other table Gideon Engelbrecht May 27, 2022 11:54PM Sorry, you can't reply to this topic. It has been closed. ...
http://dba.stackexchange.com/questions/119621/how-to-update-10-million-rows-in-mysql-single-table-as-fast-as-possible http://stackoverflow.com/questions/6393763/fast-cross-table-update-with-mysql http://stackoverflow.com/questions/11709043/mysql-update-column-with-value-from-another-table...
在上述示例中,update_another_table是触发器的名称,table1是要插入数据的表,table2是要更新数据的另一个表,column1是要更新的列,id是用于匹配两个表的关联字段。 插入数据: 代码语言:txt 复制 INSERT INTO table1 (column1, column2) VALUES ('value1', 'value2'); 当执行上述插入语句时,触发器会自动触发...
UPDATE table1 t1 JOIN table2 t2 ON t1.common_field = t2.common_field SET t1.field_to_update = CASE WHEN some_condition THEN t2.value_if_true ELSE t1.field_to_update END WHERE another_condition; 注意事项 性能考虑:多表更新操作可能会涉及大量的数据扫描和连接操作,因此在实际应用中需要注意...
Update Table based on Another Table 首先,我们需要连接两个表,并指定连接条件。下面是示例代码: SELECT*FROMtable1INNERJOINtable2ONtable1.id=table2.id; 1. 2. 3. 4. 在上述代码中,我们使用了INNER JOIN操作,连接了table1和table2两个表,通过id列进行连接。
INSERT INTO table_name(column_list) SELECT select_list FROM another_table WHERE condition; INSERT ON DUPLICATE KEY UPDATE statement(插入更新数据)如果目标表里已经存在相同的主键,则执行下面的更新字段的SQLINSERT INTO table (column_list) VALUES (value_list) [SELECT ...FROM ... WHERE] ON DUPLICATE ...
你也可以使用ALTER TABLE语句的ALGORITHM和LOCK子句来控制DDL操作的某些方面。这些子句放在语句的末尾,用逗号与表和列的规范分隔。例如: alter table ALGORITHM [=] {DEFAULT | INSTANT | INPLACE | COPY} COPY: 这种操作是在原始表的一个副本上进行的,表数据会逐行从原始表复制到新表。在此过程中,不允许进行并...
Re: Update from another table if substring exists in second table Peter Brawley May 31, 2021 01:02PM Re: Update from another table if substring exists in second table Gideon Engelbrecht June 01, 2021 04:21AM Sorry, you can't reply to this topic. It has been closed....