Mysql 查询

Posted 2021-01-27 橘子味儿的猫

 

 

按时间 【年、月、周、日】 分组查询统计数据

<!-- 按日查询-->
SELECT  DATE_FORMAT(created_at,\'%Y-%m-%d\') as day, SUM(COUNT) FROM collect GROUP BY day;

<!-- 按周查询-->
SELECT  DATE_FORMAT(created_at,\'%Y-%u\') as day, SUM(COUNT) FROM collect GROUP BY day;

<!-- 按月查询-->
SELECT  DATE_FORMAT(created_at,\'%Y-%m\') as day, SUM(COUNT) FROM collect GROUP BY day;

<!-- 按年查询-->
SELECT  DATE_FORMAT(created_at,\'%Y\') as day, SUM(COUNT) FROM collect GROUP BY day;

 

时间比较

• 存储格式：2018-12-19 17:00:32

SELECT * FROM t_bill where Date(bil_create_time) > \'2018-12-19 16:56:15\';

 

添加事件

• 每隔一分钟执行一次

CREATE event IF NOT EXISTS temp_event ON SCHEDULE EVERY 1 MINUTE   
ON COMPLETION PRESERVE   
DO update t_withdraw
set wit_state=1 where wit_id=1;

• 每天凌晨1点执行

CREATE event IF NOT EXISTS temp_event ON SCHEDULE EVERY 1 DAY STARTS DATE_ADD(DATE_ADD(CURDATE(), INTERVAL 1 DAY), INTERVAL 1 HOUR)    
ON COMPLETION PRESERVE  
DO INSERT INTO T_LOG(date) VALUE (NOW())

• 查看定时任务

SELECT * FROM information_schema.events; 

• 关闭定时任务

DROP event temp_event;

•  查看并打开event_scheduler调度事件

show variables like \'%sche%\';

注：如果event_scheduler值为OFF则使用   【set global event_scheduler =1;】   打开。

 

详情介绍：https://blog.csdn.net/tantexian/article/details/50317829 

 

 

循环插入数据

• 循环插入 10000 条数据

DROP PROCEDURE IF EXISTS proc_initData;  -- 如果存在此存储过程则删除
DELIMITER $
CREATE PROCEDURE proc_initData()
BEGIN
    DECLARE i INT DEFAULT 1;
    WHILE i<=10000 DO
        INSERT INTO T_LOG(date,msg) VALUE (NOW(), i);
        SET i = i+1;
    END WHILE;
END $

CALL proc_initData();　　-- 调用方法

 

将查询结果插入到另外一张表

• 基本语法   INSERT INTO 表名1(字段列表1) SELECT 字段列表2 FROM 表名2 WHERE 查询条件;

INSERT INTO t_log(date,msg) SELECT now(), sho_id FROM t_shop

 

日期加一天

SELECT * FROM t_bill WHERE bil_create_time >= \'2018-12-20 00:00:00\' AND 
bil_create_time <= DATE_ADD(\'2018-12-20 00:00:00\',INTERVAL 1 DAY) 

 

nodejs 获取 明天的日期

　　引入  【moment】

bower install moment --save # bower
npm install moment --save   # npm
Install-Package Moment.js   # NuGet
spm install moment --save   # spm
meteor add momentjs:moment  # meteor

　　调用

var moment = require(\'moment\');


// 在当前日期的基础上加24小时 --- 获取第二天的日期
var day = moment(body.date);
var toDate = day.add(\'hours\',24).format(\'YYYY-MM-DD HH:mm:ss\');

 

 

嵌套查询

SELECT *, (SELECT COUNT(1) FROM t_shop WHERE sho_age_id = age_id) as c FROM t_agent