Sample Solution: -- This query retrieves the maximum 'grade' value for each 'city' from the 'customer' table.SELECTcity,MAX(grade)-- Specifies the table from which to retrieve the data (in this case, 'customer').FROMcustomer-- Groups the result set by the 'city' column.GROUPBYcity; C...
CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT /* 设定n*/ BEGIN DECLARE M INT; SET M=N-1; RETURN ( # Write your MySQL query statement below. SELECT DISTINCT Salary FROM Employee ORDER BY Salary DESC LIMIT M, 1 ); END 注意:这里不能直接在limit后面引用n-1,因为limit不识别...
Selection(选择): A select operation selects a subset of rows (records) in a table (relation) that satisfy a selection condition. The ability to select rows from out of complete result set is called Selection. It involves conditional filtering and data staging. The subset can range from no r...
SQL Server How to select the minimum value within a group that maximizes another value?You can ...
set_model('chinook') # STEP 03: Connect with the database vn.connect_to_sqlite('https://vanna.ai/Chinook.sqlite') # STEP 04: Ask a question vn.ask('What are the top 10 artists by sales?') 📃 sql query 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SELECT a.name, sum(il....
Sub SelectX3() Dim dbs As Database, rst As Recordset ' Modify this line to include the path to Northwind ' on your computer.Setdbs = OpenDatabase("Northwind.mdb")' Count the number of employees, calculate the 'average salary,andreturnthe highest salary.Setrst = dbs.OpenRecordset("SELECT...
The following example returns the maximum value from the list of constants that is provided. The scale of the return type is determined by the scale of the argument with the highest precedence data type. SQL კოპირება SELECT GREATEST('6.62', 3.1415, N'7') AS Gr...
SELECT wt.session_id, wt.wait_type , er.last_wait_type AS last_wait_type , wt.wait_duration_ms , wt.blocking_session_id, wt.blocking_exec_context_id, resource_description FROM sys.dm_os_waiting_tasks wt JOIN sys.dm_exec_sessions es ON wt.session_id = es.session_id JOIN sys.dm_...
--get the highest slot count from the bucketizer SELECT @slot_count = @xml_result.value(N'(//Slot/@count)[1]', 'int'); --if the slot count is higher than the threshold in the one minute period --dump the process and clean up session ...
One method to identify which SQL statements are creating the highest load is to compare the resources used by a SQL statement to the total amount of that resource used in the period. ForBUFFER_GETS, divide each SQL statement'sBUFFER_GETSby the total number of buffer gets during the period....