mysql 数据库基本操作

0. 查询操作

# set的用法；like的用法，注意‘’
# 方法1
set @var1=1, @var4=(select report_uuid  from report_reportinfo where report_path like '%20210112%' limit 1);
select @var1, @var4;
delete from report_reportdetail where fk_report_uuid_id =@var4;
delete from report_report_reportperiod  where fk_report_uuid_id =@var4;
delete from report_reportinfo where report_uuid =@var4;
# 方法2 （推荐）
set @var0=20210112;
set @var1=(select report_uuid  from report_reportinfo where report_path like  concat( '%' ,@var0, '%' ) limit 1);
select @var1;
delete from report_reportdetail where fk_report_uuid_id =@var1;
delete from report_report_reportperiod  where fk_report_uuid_id =@var1;
delete from report_reportinfo where report_uuid =@var1;



# 将SQL查询结果作为查询条件进行查询
# 1. 单行子查询 ：单行比较符号（＝, >, <, >=, <=, <>）
select ename,deptno,sal  from emp  where deptno=(select deptno from dept where loc='XI AN'); 

# 2. 多行子查询: 必须用多行比较符号（IN，ALL,ANY）来进行比较,ALL 和ANY 操作符都不可以单独使用，只能与单行比较符（=、>、< 、>= 、<= 、<>）结合使用
# 查询选修了老师名叫Lee(假设唯一)的学生名字： 
select stName from Student where stId in(select distinct stId from score where teId=(select teId from teacher where teName='Lee'));    
# 查询所有部门编号为A的资料： 
SELECT ename,job,sal FROM EMP WHERE deptno in ( SELECT deptno FROM dept WHERE dname LIKE 'A%'); 
# 多行子查询使用ALL操作符：查询有一门以上的成绩高于Lee的最高成绩的学生的名字:
select stName from Student where stId in(select distinct stId from score where score >all(select score from score where stId=(select stId from Student where stName= 'Lee') )); 
# 多行子查询使用ANY操作符号例子：查询有一门以上的成绩高于Lee的任何一门成绩的学生的名字: 
select stName from Student where stId in(select distinct stId from score where score >any(select score from score where stId=(select stId from Student where stName='Lee')));
	
 
# 时间相关的查询
# 查询7天内的数据
SELECT * FROM db5.report_reportdetail where (case_name = 'Throughput' or case_name = 'Traffic') and result = 'pass' and date_sub(CURDATE(),INTERVAL 7 DAY) <= DATE(report_create_time) order by report_create_time desc   ;
# 参考
https://blog.csdn.net/ls1645/article/details/79118464



# group by 处理字符串聚合的方法
SELECT AVG(time2.`Rx Carrier deactivate time in radio`) as soap1, AVG(time1.rru_reset_detected) as warm_reset_detected,AVG(time1.rru_reset_enable)  as warm_reset_enable,AVG(time1.rru_reset_onair) as warm_reset_onair,AVG(time1.rru_reset_detected)+AVG(time1.rru_reset_enable)+AVG(time1.rru_reset_onair) as totol,version1.rru_vesion  FROM report_report_reportperiod AS time1 LEFT JOIN report_parse_soap_result AS time2 on time1.fk_report_uuid_id = time2.fk_report_uuid_id LEFT JOIN report_reportinfo AS info1 on time1.fk_report_uuid_id = info1.report_uuid LEFT JOIN  report_reportdetail AS version1  on time1.fk_report_uuid_id = version1.fk_report_uuid_id where  time1.rru_reset_detected  >0 and info1.platform_name='AEQE' group by version1.rru_vesion;


# group by 处理字符串聚合的方法+替换
SELECT  AVG(time2.`PTP sync time BETWEEN RU AND DU`)                                         AS PTP_sync 
       ,AVG(time2.`Radio data path sync time`)                                               AS path_sync 
       ,AVG(time2.`Tx Carrier setup time IN radio`)                                          AS Tx_setup 
       ,AVG(time2.`Rx Carrier setup time IN radio`)                                          AS Rx_setup 
       ,AVG(time2.`Tx Carrier activate time IN radio`)                                       AS Tx_activate 
       ,AVG(time2.`Rx Carrier activate time IN radio`)                                       AS Rx_activate 
       ,AVG(time2.`Tx Carrier deactivate time IN radio`)                                     AS Tx_deact
       ,AVG(time2.`Rx Carrier deactivate time IN radio`)                                     AS Rx_deact
       ,AVG(time1.rru_reset_detected)                                                        AS reset_detected 
       ,AVG(time1.rru_reset_enable)                                                          AS reset_enable 
       ,AVG(time1.rru_reset_onair)                                                           AS reset_onair 
       ,AVG(time1.rru_reset_detected)+AVG(time1.rru_reset_enable)+AVG(time1.rru_reset_onair) AS totol_reset_time 
       ,left(replace(version1.rru_vesion,'RFSW Vesion:',''),31)                              AS RRU_version
       ,left(GROUP_CONCAT(version1.bbu_vesion),30)                                           AS BBU_version
FROM report_report_reportperiod AS time1
LEFT JOIN report_parse_soap_result AS time2
ON time1.fk_report_uuid_id = time2.fk_report_uuid_id
LEFT JOIN report_reportinfo AS info1
ON time1.fk_report_uuid_id = info1.report_uuid
LEFT JOIN report_reportdetail AS version1
ON time1.fk_report_uuid_id = version1.fk_report_uuid_id
WHERE time1.rru_reset_detected >0 
AND info1.platform_name='AEQE' 
GROUP BY  version1.rru_vesion; 

1. 修改操作

# order by id desc limit 20 都是用来修饰where的，也就是说只是修改 20个最大的ID
update report_reportdetail set case_name = 'Throughput' where case_name = 'Traffic' and result = 'pass' order by id desc limit 20  ;

2. 创建数据库

CREATE DATABASE IF NOT EXISTS `DatabaseName1` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE `DatabaseName2` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
create database DatabaseName3 DEFAULT CHARACTER set utf8;

show databases;
drop database <数据库名>;

2. 创建表

use db1
CREATE TABLE person2(id  INTEGER PRIMARY KEY NOT NULL,time TEXT NOT NULL,name varchar(100) NOT NULL);
insert into person2(time, name) values('1', 'bill')

insert into person2(id,time, name) values(1,'1', 'bill'); # id 不是自动


# 应用
CREATE TABLE `db5`.`report_l1_statistics_time` (
  `id_report_l1_statistics_time` INT NOT NULL,
  PRIMARY KEY (`id_report_l1_statistics_time`));

3. navicat对应操作

https://jingyan.baidu.com/article/9989c746d0ae18f648ecfefc.html

4.mysql 远端连接方法

https://cloud.tencent.com/developer/article/1153843

1、显示密码 
如：MySQL 连接远程数据库（192.168.5.116），端口“3306”，用户名为“root”，密码“123456” 
C:/>mysql -h 192.168.5.116 -P 3306 -u root -p 123456 

2、隐藏密码 
如：MySQL 连接本地数据库，用户名为“root”， 
C:/>mysql -h localhost -u root -p 
 Enter password: