数据库命令
1、把表mms_group的gbcode列置空
UPDATE mms_group set gbcode=''
2、从表mon_channel中查找channelname字段为“07宁波特勤一中队通信室%”的列
SELECT *from mon_channel where channelname like '07宁波特勤一中队通信室%'
3、删除行
DELETE from mon_channel where channelid='10.227.123.62@nb.zj.xf_00'
4、
删除表内容,结构还在
truncate gbcode_dict
删除表结构
drop table gbcode_dict
5、在map_overlay表中字段datatype为空时插入channel
update map_overlay set datatype='channel' where datatype IS Null
6、查询map_overlay表中有多少条数据
select count(1) from map_overlay
7、SELECT *from map_overlay
-- update map_overlay set lat='' ,lng='',datatype='channel'
-- DELETE from map_overlay
where name like 't000%';
-- update map_overlay set lat='' ,lng='',datatype='channel'
-- DELETE from map_overlay
where name like 't000%';
8.更改maps.plan_channel表的channelId字段的所有值(如123@gz_00会被改成123@yj.sf_00),最好先查询在更新值
UPDATE maps.plan_channel set channelId=concat(substring_index(channelId,'@',1),'@yj.sf_00')
SELECT a.*,concat(substring_index(channelId,'@',1),'@yj.sf_00') FROM plan_channel a (把plan_channel表名重命名为a)
SELECT a.*,concat(substring_index(channelId,'@',1),'@yj.sf_00') FROM plan_channel a (把plan_channel表名重命名为a)