influxdb query

Group queriesThe T-SQL statements that take a group query are as follows.SELECT Courseid,avg (Score) As course average resultsFrom scoreGROUP by CourseID(1) What is the number of students in each gender?SELECT COUNT (*) as number of SSex from StudentsGROUP by SSex(2) Check the total number of people in each gradeSELECT COUNT (*) as grade number, Sgrade from StudentsGROUP by Sgrade(3) The average score of each account is queried and displayed in order

Public Account weather query interface instance, public weather query instance. Public Account weather query interface instance. public weather query instance this is a weather query interface from Baidu API. it supports query of

After learning how to use ibatis over the past few days, I suddenly used fuzzy queries and dynamic multi-condition queries. I tried it for a long time based on my own ideas and did not solve this problem.The first problem is fuzzy query. At the beginning, I used the following conditions: Select * from user where name like '% # value # % '. but why not? It seems that an error has been reported. later, I found a solution on the Internet, which is to use

A "common" query paging class that can be used to query all tables In a recent whim, I hope to write a paging class that can be used to query all tables. In actual development, I am afraid that the most frequently used code is to query and display the result set by PAGE, while the table structure is diverse, I want to

Lesson 5 MongoDB Data Query (II): mongodb Data Query1. Course outlineThis course continues to explain MongoDB Data Query related content, including MongoDB cursor, fuzzy query, and use of findAndModify functions. 1. MongoDB cursor 2. fuzzy query 3. Use of the findAndModify Function2. the course introduction will first

Lesson 4 MongoDB Data Query (1): mongodb Data Query1. Course outlineThis course mainly describes MongoDB Data Query related content, including the introduction and use of the find function, query operator introduction and use, embedded document query, and array query. 1. Int

A "common" query paging class that can be used to query all tables In a recent whim, I hope to write a paging class that can be used to query all tables. In actual development, I am afraid that query and display result sets by page are the most useful.CodeThe table structure is diverse. I want to improve the code reu

Because the user record is too much (3 million), the paging query becomes very slow, how to optimize the statement or index? Do you have any optimization plan? Supplemental content:Thank you for your proposal, I see very inspired, but the combination of my situation is more special, not very applicable. The details are as follows:1 when the user opens the participation record page, it is time to display the record of the latest 10 participants. (Thes

4. Select the query conditions from the form. Although the preceding method is simple, it is not convenient for the user and difficult for the designer to control it. If it is implemented through a form, these problems can be solved. In the following form, you can select the name of the driver to be queried in the combo box, and press the query button to view the quer