mysql 字段定义 对 大小比较的影响

SELECT max(a) FROM zanbao.new_table;

CREATE TABLE `new_table2` (
  `HD` varchar(8) NOT NULL COMMENT '设备ID',
  `VER` varchar(20) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  
  PRIMARY KEY (`HD`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

000001da 000001dB

select * from  zanbao.new_table2;

select max(HD) from  zanbao.new_table2; -- '000001dB'

select max(VER) from  zanbao.new_table2; -- '000001da'

 

 select * from zanbao.zb_dev_info_moni where hd= '0850002I' order by UDATE8035  ;
 select * from zanbao.zb_dev_info_moni where hd= '0850002I' order by UDATE9;

select UD from  lfchat.lf_usr_info t where t.TEL = '17876992101' and ('000001da'<'000001dB'); -- 000008
 
select * from zanbao.zb_dev_usr_rel t where t.hd ='0850002I' and t.ver = '000001da'; -- 000001dB

select ai from zanbao.zb_dev_usr_rel;

select distinct(ud) from zanbao.zb_dev_usr_rel t where t.hd ='0850002I' ;

select max(ver) from zanbao.zb_dev_usr_rel t where t.hd ='0850002I'; -- 000001dB
select max(ver) from zanbao.zb_dev_info t where t.hd ='0850002I';



update zb_dev_usr_rel set nc ='[{\"S_NT_3\":\"S_NT_3\",\"N_A\":\"赞宝专用--开机铃声\",\"S_NT_4\":\"S_NT_4\",\"S_NT_6\":\"S_NT_6\",\"S_BTN_A\":\"S_BTN_A\",\"N_E\":\"赞宝专用——无网络信号铃声\",\"N_N\":\"赞宝专用——未连接网络铃声\",\"N_B\":\"赞宝专用--关机铃声\",\"ST\":\"ST\",\"S_BTN_C\":\"S_BTN_C\",\"N_C\":\"赞宝专用——无网络配置铃声\",\"S_NT_7\":\"S_NT_7\",\"SD\":\"SD\",\"N_H\":\"赞宝专用——连接网络超时铃声\",\"N_J\":\"赞宝专用——登录成功铃声\",\"N_G\":\"赞宝专用——连接网络失败铃声2\",\"S_NT_5\":\"S_NT_5\",\"S_NT_8\":\"S_NT_8\",\"N_I\":\"赞宝专用——登录失败铃声\",\"N_L\":\"赞宝专用——按键发送失败铃声\",\"S_BTN_B\":\"S_BTN_B\",\"N_F\":\"赞宝专用——连接网络失败铃声\",\"S_NT_1\":\"S_NT_1\",\"N_D\":\"赞宝专用——网络连接铃声\",\"S_NT_2\":\"S_NT_2\"}]' where hd ='0850002I';

SELECT * FROM zanbao.zb_dev_info t where t.hd ='0850002I';

update zanbao.zb_dev_info set nc ='[{\"S_NT_3\":\"S_NT_3\",\"N_A\":\"赞宝专用--开机铃声\",\"S_NT_4\":\"S_NT_4\",\"S_NT_6\":\"S_NT_6\",\"S_BTN_A\":\"S_BTN_A\",\"N_E\":\"赞宝专用——无网络信号铃声\",\"N_N\":\"赞宝专用——未连接网络铃声\",\"N_B\":\"赞宝专用--关机铃声\",\"ST\":\"ST\",\"S_BTN_C\":\"S_BTN_C\",\"N_C\":\"赞宝专用——无网络配置铃声\",\"S_NT_7\":\"S_NT_7\",\"SD\":\"SD\",\"N_H\":\"赞宝专用——连接网络超时铃声\",\"N_J\":\"赞宝专用——登录成功铃声\",\"N_G\":\"赞宝专用——连接网络失败铃声2\",\"S_NT_5\":\"S_NT_5\",\"S_NT_8\":\"S_NT_8\",\"N_I\":\"赞宝专用——登录失败铃声\",\"N_L\":\"赞宝专用——按键发送失败铃声\",\"S_BTN_B\":\"S_BTN_B\",\"N_F\":\"赞宝专用——连接网络失败铃声\",\"S_NT_1\":\"S_NT_1\",\"N_D\":\"赞宝专用——网络连接铃声\",\"S_NT_2\":\"S_NT_2\"}]' where hd ='0850002I';