How to use the avg function from knex
Find comprehensive JavaScript knex.avg code examples handpicked from public code repositorys.
knex.avg() calculates the average value of a specified column in a database table.
42 43 44 45 46 47 48 49 50 51// .select(knex.ref('id').as('identifier')) // .select(knex.ref('login').as('name')) // .from('users'); //const data = await knex.sum('age').from('users2'); //const data = await knex.avg('age').from('users2'); //const data = await knex.max('age').from('users2'); //const data = await knex.min('age').from('users2'); // const data = await knex.avg('sum_age').from(function () {
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How does knex.avg work?
knex.avg is a method in the Knex query builder library that generates a SQL query to calculate the average value of a given column in a database table. It generates an SQL query with the AVG() function and returns a promise that resolves to the average value. The method takes a column name as its argument.
Ai Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18const knex = require("knex")({ client: "mysql", connection: { host: "localhost", user: "your_database_user", password: "your_database_password", database: "your_database_name", }, }); knex("table_name") .avg("column_name as average") .then((result) => { console.log(result[0].average); }) .catch((error) => { console.log(error); });
This code connects to a MySQL database using Knex and calculates the average value of a column in a table named table_name. The result of the query is returned as a Promise, which resolves to an array containing an object with a single property named average, representing the calculated average value. The result can be accessed using result[0].average.
