$sql="UPDATE another_table SET value = '$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...
SELECTname,ageFROMusers; 1. 2. 这将返回users表中所有用户的name和age列的值。 UPDATE SELECT用法 在某些情况下,我们可能需要使用SELECT语句的结果来更新表中的数据。这可以通过将SELECT语句嵌套在UPDATE语句中来实现。具体的用法如下: UPDATEtable_nameSETcolumn1=(SELECTcolumn2FROManother_tableWHEREcondition)WHERE...
Update one table with a select form another John Biddulph July 28, 2021 02:24PM Re: Update one table with a select form another Peter Brawley July 28, 2021 03:36PM Sorry, you can't reply to this topic. It has been closed.
SELECT `nickname`,`email`FROM `testtable`WHERE `name`='张三' 复制代码 (一) 选择列表 选择列表(select_list)指出所查询列,它可以是一组列名列表、星号、表达式、变量(包括局部变 量和全局变量)等构成。 1、选择所有列 例如,下面语句显示testtable表中所有列的数据: SELECT * FROM testtable 复制代码 2、...
UPDATE table1 t1 SET t1.field_to_update = ( SELECT t2.value_to_set FROM table2 t2 WHERE t1.common_field = t2.common_field LIMIT 1 ) WHERE EXISTS ( SELECT 1 FROM table2 t2 WHERE t1.common_field = t2.common_field ); 3. 使用 FROM 子句(MySQL 8.0+) 在MySQL 8.0及更高版本中,...
update a, b set a.title=b.title, a.name=b.name where a.id=b.id Solution 3: 采用子查询 update student s set city_name = (select name from city where code = s.city_code); REF: http://dba.stackexchange.com/questions/119621/how-to-update-10-million-rows-in-mysql-single-table-as...
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 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: ...
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 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. ...