mssql 常用SQL语句或函数

按 OrderDate 的顺序计算 SalesOrderHeader 表中所有行的行号，并只返回行 50 到 60（含）。

WITH OrderedOrders AS
(
    SELECT SalesOrderID, OrderDate,
    ROW_NUMBER() OVER (ORDER BY OrderDate) AS RowNumber
    FROM Sales.SalesOrderHeader 
) 
SELECT SalesOrderID, OrderDate, RowNumber  
FROM OrderedOrders 
WHERE RowNumber BETWEEN 50 AND 60;

 

将 ROW_NUMBER () 与 PARTITION 一起使用

TerritoryName 子句对整个查询结果集进行排序。

USE AdventureWorks2012;
GO
SELECT FirstName, LastName, TerritoryName, ROUND(SalesYTD,2,1),
ROW_NUMBER() OVER(PARTITION BY TerritoryName ORDER BY SalesYTD DESC) AS Row
FROM Sales.vSalesPerson
WHERE TerritoryName IS NOT NULL AND SalesYTD <> 0
ORDER BY TerritoryName;

 MERGE 

    MERGE Production.UnitMeasure AS target
    USING (SELECT @UnitMeasureCode, @Name) AS source (UnitMeasureCode, Name)
    ON (target.UnitMeasureCode = source.UnitMeasureCode)
    WHEN MATCHED THEN 
        UPDATE SET Name = source.Name
WHEN NOT MATCHED THEN
    INSERT (UnitMeasureCode, Name)
    VALUES (source.UnitMeasureCode, source.Name)
    OUTPUT deleted.*, $action, inserted.* INTO #MyTempTable;

借助派生的源表，使用 MERGE 对目标表执行 UPDATE 和 INSERT 操作

该示例还说明了如何在表变量中存储 OUTPUT 子句的结果，并且说明存储结果之后如何通过执行返回已插入和更新的行的计数的简单选择操作来汇总 MERGE 语句的结果。

 

-- Create a temporary table variable to hold the output actions.

DECLARE @SummaryOfChanges TABLE(Change VARCHAR(20));

MERGE INTO Sales.SalesReason AS Target
USING (VALUES ('Recommendation','Other'), ('Review', 'Marketing'), ('Internet', 'Promotion'))
       AS Source (NewName, NewReasonType)
ON Target.Name = Source.NewName
WHEN MATCHED THEN
UPDATE SET ReasonType = Source.NewReasonType
WHEN NOT MATCHED BY TARGET THEN
INSERT (Name, ReasonType) VALUES (NewName, NewReasonType)
OUTPUT $action INTO @SummaryOfChanges;

-- Query the results of the table variable.
SELECT Change, COUNT(*) AS CountPerChange
FROM @SummaryOfChanges
GROUP BY Change;