publicfunctiongetAverageUserRatingInPercentageAttribute(){return$this->feedback_count ?intval(($this->positive_feedback_count *100) /$this->feedback_count) :0; } I already tried this in SQL: User::withCount(['s
查询构建器建立在Database Access Objects基础之上,可让你创建 程序化的、DBMS无关的SQL语句。相比于原生的SQL语句,查询构建器可以帮你 写出可读性更强的SQL相关的代码,并生成安全性更强的SQL语句。 使用查询构建器通常包含以下两个步骤: 创建一个yii\db\Query对象来代表一条 SELECT SQL 语句的不同子句(例如SELECT...
The join hint for the pair of tables might only restrict the selection of allowed join methods in the query hint. For more information, see Join hints. DISABLE_OPTIMIZED_PLAN_FORCING Applies to: SQL Server (Starting with SQL ...
Applies to: SQL Server (starting with SQL Server 2016 (13.x)) and Azure SQL Database. Prevents a spool operator from being added to query plans (except for the plans when spool is required to guarantee valid update semantics). The spool operator can reduce performance in some s...
Applies to: SQL Server (starting with SQL Server 2016 (13.x)) and Azure SQL Database. Prevents a spool operator from being added to query plans (except for the plans when spool is required to guarantee valid update semantics). The spool operator can reduce performance in some scenarios. F...
Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed Instance Returns aggregate performance statistics for cached query plans in SQL Server. The view contains one row per query statement within the cached plan, and the lifetime of the rows are tied to the plan itself. When...
SQL Server versionExecution metricStatistic function SQL Server 2016 (13.x)CPU time, Duration, Execution count, Logical reads, Logical writes, Memory consumption, Physical reads, CLR time, Degree of parallelism (DOP), and Row countAverage, Maximum, Minimum, Standard Deviation, Total ...
Multiple tuning sessions can be created on a single database over time, but only one active session can exist for any given database. Create a database upgrade session In SQL Server Management Studio, open the Object Explorer and connect to Database Engine. For the database th...
In this chapter from SQL in 24 Hours, Sams Teach Yourself, 6th Edition, you learn how to count values in columns, count rows of data in a table, get the maximum and minimum values for a column, figure the sum of the values in a column, and figure the average value for values in ...
Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>) Computes the average of a sequence ofInt32values that are obtained by invoking a transform function on each element of the input sequence. Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) ...