How to Use the AVG function in MySQL to calculate the average value,
The AVG function of MySQL is used to obtain the average value of fields in various records.
For more information about the AVG function, consider that the EMPLOYEE_TBL table has the following records:
mysql> SELECT * FROM employee_tbl;+------+------+------------+--------------------+| id | name
Tags: http ima picture average src New one column mean valueSQL avg SyntaxSELECT AVG (column_name) from table_nameNew table:StudentSs_id Grade Name Phone1 98 Xiao Ming 1234562 97 small Yellow 2324563 95 Small Mile 9876544 93 Little 6543215 90 Pico 321065Inquire:SELECT AVG (Grade) as Gradeaverage from StudentSResults:Gradeaverage94We want to find the names of stud
The operation of the Aggregate function targets a series of values and returns a single value. Note: If a SELECT statement is used in many other expressions in the list of items in the SELECT statement, the select must use the GROUP by statement! First, all SQL instances are used to the following table
o_id
OrderDate
Orderprice
Customer
1
2008/12/29
1000
Bush
2
2008/11/23
1600
Carter
3
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We are introducingOracleIf there is a null value in the given value,OracleThese null values are ignored. This processing method most of the time meets our requirements, but sometimes there may be problems.
For example, when the year ends, the company will reward some employees, but some of them will not be rewarded. For example, if an employee's reward amount is saved in a table, the reward amount corresponding to some employees is null because they are not rewarded at all, now, the boss asks
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SQL Getting Started Tutorial: SQL AVG () function
AVG () functionAVG () function returns the average value of the values column.AVG () syntax for the database
SELECT AVG (column_name) from table_name
Let's look at a table first.
_id
orderdate
orderprice
customer
1
2008/11/12
Hive There are a number of analytic functions available to complete the responsible statistical analysis. This article first describes the sum , AVG , MIN , the four functions of Max . Environmental information:Hive version number is Apache-hive-0.14.0-binHadoop version number is hadoop-2.6.0Tez version number is tez-0.7.0To construct the data:p088888888888,2016-02-10,1p088888888888,2016-02-11,3p088888888888,2016-02-12,1p088888888888,2016-02-13,9p0888
The average value of items during the defined evaluation period.Format: avg (sec | # num, Sec or # num)Supported value types: floating, INTExample:Avg (#5): 5 latest average valuesAvg (1 h): Average value within one hourAvg (1 h, 1d): Average value of one hour before a dayI. Example:1, hourly average{Www.111cn.net: nginx. http. avg (1 h) }= 30000The hourly average value of nginx http key is triggered if = 3
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Original in August 02, 2009, October 22, 2009 migration to this.
Oracle Analysis Function--sum,avg,min,max,count
SUM
Function Description: This function calculates the cumulative and the expression in the group.
Sample: The following example calculates the salary cumulative value of an employee under the same manager
MIN
Feature Description: Finds the minimum value of an expression in a data window in a group.
Sample: In the example below, Dept_min
Original: LINQ to SQL (Group by/having/count/sum/min/max/avg operator)Group by/having operatorScenario : grouping data to narrow the scope for us to find data.Description : An enumerable object that is assigned and returned after a group operation on an incoming parameter. To group or delay1. Simple form:var q = from p in db. Products Group p by P.categoryid into G select G;Statement Description: Use GROUP by to divide the product by Category
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all students Use School; Select avg from Tb_student;CelingCeling translation comes from the meaning of "ceiling", meaning, regardless of what is behind the decimal point, go upward. Like the upper age average. Use School; Select Ceiling (avg(age)) from Tb_student;Of course, and the ceiling corresponding to the floor function, of course, it means the opposite.Floor Use School; Select Floor (
LINQ to SQL statement (2) Count/Sum/Min/Max/Avg operator,Use Cases
Similar to aggregate functions in SQL, this function is used for statistics without delay. For example, return the number of elements in the sequence, sum, minimum, maximum, and average.Count
Note:Returns the number of elements in the Set, Int type, and the SQL statement is SELECT COUNT (*) FROM.
1. Simple Form
Return order quantity.
var q = context.Orders.Count();
2. Condition form
R
Linq to SQL (Group By/Having/Count/Sum/Min/Max/Avg operator ),Group By/Having Operator
Applicable scenarios: Grouping data. narrow down the scope of data for us.
Description: Assigns and returns the enumerated objects after grouping the input parameters. Group; Delay1. Simple Form:
var q = from p in db.Products group p by p.CategoryID into g select g;
Statement Description: Use Group By to divide products By CategoryID.
Note: from p in db. Pr
c.Country == "UK" || c.Country == "USA" select (newXElement("Customer", newXAttribute("CustomerID", c.CustomerID), newXAttribute("CompanyName", c.CompanyName), newXAttribute("InterationalPhone", PhoneNumberConverter(c.Country, c.Phone)) ))));
9. Distinct format:
Note: The filter fields have different values. Used to query non-repeated result sets. The SQL statement is: SELECT DISTINCT [City] FROM [MERs]
var q = ( from c in db.Customers select c.City ) .Distinct();
Statem
Group
Group by can also be grouped by multiple fields (","), but in this example, only the continent field is suitable for grouping,Only the area and population fields are suitable for statistics.
In this example:
Code file:
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