extract(type from date)表示从日期date中抽取type指定的部分,type可以是year month day hour minute second(时间单位: https://dev.mysql.com/doc/refman/8.0/en/expressions.html#temporal-intervals) date_add(date, interval 表达式 type)表示计算从时间点“date”开始,向前或者向后一段时间间隔的时间。“表达...
-h127.0.0.1mysql:[Warning]Using a password on the command lineinterfacecanbe insecure.Welcome to the MySQL monitor.Commands endwith;or \g.Your MySQL connection id is4Server version:5.7.38MySQL CommunityServer(GPL)Copyright(c)2000,2022,Oracle and/or its affiliates.Oracle is a registered trademark...
So with MySQL Shell in SQL mode, you could now execute the script in the /tmp/mydata.sql file from either interactive mode or batch mode using any of these three commands: source /tmp/mydata.sql; source /tmp/mydata.sql \. /tmp/mydata.sql The command \source /tmp/mydata.sql ...
③ 查看mysql的负载能力,可能存在mysql的负载过高我们连接不上;一般是看processlist来看下具体线程和连接数运行情况:1、show processlist只能列出当前100条,我们可以看到所有用户的连接情况 mysql>show processlist;+---+---+---+---+---+---+---+---+|Id|User|Host|db|Command|Time|State|Info|+---+-...
mysql> help List of all MySQL commands: Note that all text commands must be first on line and end with ';' ? (\?) Synonym for `help'. clear (\c) Clear the current input statement. connect (\r) Reconnect to the server. Optional arguments are db and host. delimiter (\d) Set stat...
日期和时间: date、time、datetime、timestamp、year 字符串类型 字符串: char、varchar 文本: tinytext、text、mediumtext、longtext 二进制 (可用来存储图片、音乐等): tinyblob、blob、mediumblob、longblob 2.3.1整型 取值范围如果加了unsigned,则最大值翻倍,如 tinyint unsigned 的取值范围为 (0~256)。
Welcome to the MySQL monitor. Commands end with ; or g. Your MySQL connection id is 18 to server version: 5.0.26-standard-log Type 'help;' or 'h' for help. Type 'c' to clear the buffer. mysql> use test; Database changed
Note that all text commands must be first on line and end with ';' ? (\?) Synonym for 'help'. clear (\c) Clear the current input statement. connect (\r) Reconnect to the server. Optional arguments are db and host. delimiter (\d) Set statement delimiter. ...
FROM_UNIXTIME(date) 函数把 UNIX 时间戳转换为普通格式的日期时间值,与UNIX_TIMESTAMP(date)函数互为反函数。 DATE_ADD(date,INTERVAL expr type) 和 ADDDATE(date,INTERVAL expr type) 两个函数的作用相同,都是用于执行日期的加运算。date 是 DATE 或 DATETIME 的起始值。INTERVAL expr type是要添加到起始日...
Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 12 Server version: 8.0.34 MySQL Community Server - GPL Copyright (c) 2000, 2022, Oracle and/or its affiliates. Oracle is a registered trademark of Oracle Corporation and/or its ...