1 row in set (0.03 sec) 1. 2. 3. 4. 5. 6. 7. 8. 您可以使用GROUP BY子句取平均各种记录集。下面的示例将平均获取与一个人相关的所有记录,并且每个人的平均输入页面数将为平均。 SQL> SELECT name, AVG(daily_typing_pages) -> FROM employee_tbl GROUP BY name; +---+---+ | name | AV...
The MIN function returns the lowest value in a column. NULL values are not included in the calculation. Syntax :- SELECT MIN(column) FROM table EXAMPLE:- SELECT MIN(Age) FROM Persons RESULT:- 19 5. MAX () The MAX function returns the highest value in a column. NULL values are not in...
因为我用的是Mysql,所以这里用Mysql的写法来实现上述sql效果: SELECT OrderPrice AS FirstOrderPrice FROM Orders limit 0, 1; 1. 结果: 四、SQL中的LAST函数 定义:LAST() 函数返回指定的字段中最后一个记录的值。 提示:可使用 ORDER BY 语句对记录进行排序。 注:在MSSQL中不支持LAST函数,但是可以根据某一列...
Operands in expr can include the name of a table field, a constant, or a function (which can be either intrinsic or user-defined but not one of the other SQL aggregate functions). Remarks The average calculated by Avg is the arithmetic mean (the sum of the values divided by the number...
SQL DATEDIFF() SQL CONVERT() AVG() 函數 (SQL AVG() Function) AVG() 函數用來計算一數值欄位的平均值。 AVG() 語法 (SQL AVG() Syntax) SELECT AVG(column_name) FROM table_name; AVG() 函數查詢用法 (Example) 假設我們想從下面的 students 資料表中查詢學生的平均身高: ...
The SQL AVG function calculates the average of a series of values that you provide to it. Most of the time, this will be a particular column that you specify, so the average will be all of the values in that column. Just like theMINandMAXfunctions, the AVG function is a SQL standard...
The avg() function returns the average of the numbers computed. For example: sum( $arg ) div count( $arg ) If $arg is an empty sequence, the empty sequence is returned. If an xdt:untypedAtomic value cannot be cast to xs:double, the value is disregarded in the input sequence, $arg...
The SQL AVG() Function Example Find the average price of all products: SELECT AVG(Price) FROM Products; Try it Yourself » Note:NULL values are ignored. Syntax SELECT AVG(column_name) FROMtable_name WHEREcondition; Demo Database Below is a selection from theProductstable used in the exampl...
The AVG() function returns the average value of an expression.Note: NULL values are ignored. SyntaxAVG(expression)Parameter ValuesParameterDescription expression Required. A numeric value (can be a field or a formula)Technical DetailsWorks in: SQL Server (starting with 2008), Azure SQL Database,...
SQL 參考資料 文字 文件 AWS Clean Rooms SQL 參考資料 PDF RSS 焦點模式 本文為英文版的機器翻譯版本,如內容有任何歧義或不一致之處,概以英文版為準。 AVG 函數會傳回輸入表達式值的平均值 (算術平均值)。AVG 函數使用數值,並忽略 NULL 值。 語法 ...