如何在 mysql 中使用 alter 和 select 仅显示表中的数据子集？

Question

I have a MySQL table like this:

TagName, DateTime, Value
'SG_QRA_SGTC_0013.PV_Top_Temp', '2022-07-05 11:27:43.7810000', '86.4'
'SG_QRA_SGTC_0013.PV_Bot_Temp', '2022-07-05 11:27:43.7030000', '25.1'
'SG_QRA_SGHAST_0065.PV_HUMIDITY', '2022-07-05 11:27:43.6890000', '85.11'
'SG_QRA_SGHAST_0066.PV_HUMIDITY', '2022-07-05 11:27:43.6890000', '38.48'

What I want to do is to to alter the table to only show this permanently but i am unable to do so now:

TagName, DateTime, Value
'SG_QRA_SGTC_0013.PV_Top_Temp', '2022-07-05 11:27:43.7810000', '86.4'
'SG_QRA_SGTC_0013.PV_Bot_Temp', '2022-07-05 11:27:43.7030000', '25.1'

with this query:

SELECT * FROM testingintern WHERE TagName like '%Top%' OR TagName like '%Bot% AND TIME(DateTime) = '11:27:43';

Any help is appreciated thank you!

Answer 1

From the query you posted, the problem I see with it is that you forgot a ' after '%bot% , so it thinks you want something that contains %Bot% AND TIME(DateTime) = '11:27:43' instead of just %bot% . Making it '%bot%' should fix or at least get you going in the right direction