在MySQL中获取max字段对应的id,可以使用以下方法: 使用子查询:SELECT id FROM your_table WHERE max_field = (SELECT MAX(max_field) FROM your_table);这将返回具有最大max字段值的id。 使用ORDER BY和LIMIT:SELECT id FROM your_table ORDER BY max_fi
MAX query vary slowPosted by: jomy george Date: May 25, 2012 02:34AM Hi friends, I have a table in mysql created by the following statement. CREATE TABLE DATA _OUT_QUEUE( DATAOUTINFOID BIGINT UNSIGNED NOT NULL AUTO_INCREMENT, PIN VARCHAR(100) NOT NULL, MERECID VARCHAR(100)...
$result = mysql_query("SELECT *, FROM data_instant $row = mysql_fetch 浏览0提问于2012-04-02得票数 6 回答已采纳 1回答 如何修复MySQL查询别名未知列?2018年 服务器版本: 5.6.38 - MySQL社区服务器PHPMyAdmin:版本信息: 4.7.7SELECT r.id, r.url, MAX(date) as `max_date`, dateWHERE max_da...
importmysql.connector# 连接数据库connection=mysql.connector.connect(host="localhost",user="root",password="password",database="test_db")# 创建游标对象cursor=connection.cursor()# 执行查询语句query=""" SELECT t1.* FROM users t1 JOIN (SELECT MAX(age) as max_age FROM users) t2 ON t1.age = ...
mysql> grant all privileges on *.* totest@'%'identified by'mysql'; Query OK, 0 rows affected, 1 warning (0.01 sec) #查看变量max_connect_errors并设置值 mysql> show variables like'%max_connect_errors%'; +---+---+ | Variable_name | Value | +-...
Description:MySQL Server: 5.6.21 OS: Ubuntu 12.04 / 14.04 MAX() causes a full table scan when used in a sub-query.How to repeat:Regular query - works as expected. mysql> EXPLAIN EXTENDED -> SELECT -> MAX( fcl_bl.Bol ) -> FROM eci_lw_prod.fcl_bl -> WHERE fcl_bl.sail_date BET...
(3D000): No Database Selected MySQL ERROR 1045 CentOS或其他linux系统的美国VPS系统时间同步方法 在Centos中yum安装和卸载软件的使用方法 Centos 6.0将光盘作为yum源的设置方法 Linux -bash ./xx Permission denied 2013 Lost connection to MySQL server during query CentOS7.0 关闭firewall防火墙,改为iptables 在...
Query OK,1row affected (0.06sec) mysql>insertintomaxtestvalues(32,193); Query OK,1row affected (0.06sec) mysql>insertintomaxtestvalues(23,199); Query OK,1row affected (0.06sec) mysql>select*frommaxtest;+---+---+|age|hight|+---+---+|30|180||30|173||32|193||23|199|+---+-...
1 row in set (0.00 sec) mysql> set global max_connections=14000; Query OK, 0 rows affected (0.01 sec) mysql> show variables like '%max_connections%'; +---+---+ | Variable_name | Value | +---+---+ | max_connections | 14000 | +---+---+ 1 row in...
1 row in set (0.00 sec) mysql> set global max_connect_errors=3; Query OK, 0 rows affected (0.00 sec) mysql> show variables like '%max_connect_error%'; +---+---+ | Variable_name | Value | +---+---+ | max_connect_errors...