$sql="UPDATE another_table SET value = '$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...
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...
FROM another_table; 1. 2. 3. 这里的new_table是新表格的名称,column1、column2等是新表格的列名,another_table是另一个表的名称。你可以根据实际情况修改表格和列名。 步骤3:使用UPDATE语句更新目标表 最后,我们需要使用UPDATE语句根据新建的表格数据更新目标表。可以使用如下的UPDATE语句来更新目标表: ...
UPDATE users SET status = '退休' WHERE age > 30; 子查询更新 代码语言:txt 复制 UPDATE table_name SET column1 = (SELECT new_value FROM another_table WHERE condition) WHERE condition; 例如,根据另一个表中的数据更新当前表中的某个字段: ...
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...
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 ...
UPDATE my_table SET my_column = (SELECT my_value FROM my_table WHERE condition) WHERE another_condition; 这个错误的原因是MySQL不允许在同一个查询中同时选择和更新同一个表。为了解决这个问题,你可以尝试以下几种方法:方法一:使用临时表你可以将选择操作的结果存储在一个临时表中,然后在更新操作中使用这个...
You can create one table from another by adding a SELECT statement at the end of the CREATE TABLE statement: CREATE TABLE new_tbl [AS] SELECT * FROM orig_tbl; MySQL creates new columns for all elements in the SELECT. For example: ...
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....