SYED SAJID WASIM

Ex-AVP, DHAKABANK Limited

Ex-Sr. Database Engineer, Orion Informatics Limited

Focused on database and development technologies

MCP, MCTS, MCSE on Data Platform & Administration

Working with SQL Server since version 6.5

02 | Advanced SELECT Statements

Querying Microsoft SQL Server 2012 Jump Start

01 | Introducing SQL Server 2012

SQL Server types of statements; other SQL statement elements; basic SELECT statements

02 | Advanced SELECT StatementsDISTINCT, Aliases, scalar functions and CASE, using JOIN and MERGE; Filtering and sorting data, NULL

values

03 | SQL Server Data Types Introduce data types, data type usage, converting data types, understanding SQL Server function types

04 | Grouping and Aggregating DataAggregate functions, GROUP BY and HAVING clauses, subqueries; self-contained, correlated, and EXISTS; Views, inline-table

valued functions, and derived tables

SELECT DISTINCT <column list>

FROM <table or view>

SELECT DISTINCT StoreIDFROM Sales.Customer;

StoreID-------12345709021898710

Using aliases to refer to columns

SELECT SalesOrderID, UnitPrice, OrderQty AS Quantity

FROM Sales.SalesOrderDetail;

SELECT SalesOrderID, UnitPrice, Quantity = OrderQty

FROM Sales.SalesOrderDetail;

SELECT SalesOrderID, UnitPrice Quantity

FROM Sales.SalesOrderDetail;

SELECT SalesOrderID, ProductID

FROM Sales.SalesOrderDetail AS SalesOrders;

SELECT SalesOrderID, ProductID

FROM Sales.SalesOrderDetail SalesOrders;

SELECT SalesOrders.SalesOrderID, SalesOrders.ProductID

FROM Sales.SalesOrderDetail AS SalesOrders;

SELECT ProductID, Name, ProductSubCategoryID,

CASE ProductSubCategoryID

WHEN 1 THEN 'Beverages'

ELSE 'Unknown Category'

END

FROM Production.Product

Keyword Expression component

SELECT <select list>

CASE <value to compare>

WHEN <value to match>

THEN <result>

END N/A

FROM <table source>

Join Type Description

Cross Combines all rows in both tables (creates Cartesian product).

Inner Starts with Cartesian product; applies filter to match rows between

tables based on predicate.

Outer Starts with Cartesian product; all rows from designated table preserved,

matching rows from other table retrieved. Additional NULLs inserted as

placeholders.

SELECT SOH.SalesOrderID, SOH.OrderDate, SOD.ProductID, SOD.UnitPrice, SOD.OrderQty

FROM Sales.SalesOrderHeader AS SOH JOIN Sales.SalesOrderDetail AS SOD ON SOH.SalesOrderID = SOD.SalesOrderID;

FROM t1 JOIN t2 ON t1.column = t2.column

SELECT CUST.CustomerID, CUST.StoreID, ORD.SalesOrderID, ORD.OrderDateFROM Sales.Customer AS CUSTLEFT OUTER JOIN Sales.SalesOrderHeader ASORDON CUST.CustomerID = ORD.CustomerIDWHERE ORD.SalesOrderID IS NULL;

SELECT EMP1.BusinessEntityID, EMP2.JobTitleFROM HumanResources.Employee AS EMP1 CROSS JOIN HumanResources.Employee AS EMP2;

SELECT EMP.EmpID, EMP.LastName,EMP.JobTitle, EMP.MgrID, MGR.LastName

FROM HR.Employees AS EMPINNER JOIN HR.Employees AS MGR ON EMP.MgrID = MGR.EmpID ;

SELECT EMP.EmpID, EMP.LastName,EMP.Title, MGR.MgrID

FROM HumanResources.Employee AS EMPLEFT OUTER JOIN HumanResources.Employee AS MGRON EMP.MgrID = MGR.EmpID;

SELECT SalesOrderID, CustomerID, OrderDateFROM Sales.SalesOrderHeaderORDER BY OrderDate;

SELECT SalesOrderID, CustomerID, YEAR(OrderDate) AS OrderYearFROM Sales.SalesOrderHeaderORDER BY OrderYear;

SELECT SalesOrderID, CustomerID, OrderDateFROM Sales.SalesOrderHeaderORDER BY OrderDate DESC;

WHERE clauses use predicates

Must be expressed as logical conditions

Only rows for which predicate evaluates to TRUE are accepted

Values of FALSE or UNKNOWN are filtered out

WHERE clause follows FROM, precedes other clauses

Can’t see aliases declared in SELECT clause

Can be optimized by SQL Server to use indexes

SELECT CustomerID, TerritoryIDFROM Sales.CustomerWHERE TerritoryID = 6;

SELECT CustomerID, TerritoryIDFROM Sales.CustomerWHERE TerritoryID >= 6;

SELECT CustomerID, TerritoryID, StoreIDFROM Sales.CustomerWHERE StoreID >= 1000 AND StoreID <= 1200;

SELECT TOP (20) SalesOrderID, CustomerID, TotalDueFROM Sales.SalesOrderHeaderORDER BY TotalDue DESC;

SELECT TOP (20) WITH TIES SalesOrderID, CustomerID, TotalDueFROM Sales.SalesOrderHeaderORDER BY TotalDue DESC;

SELECT TOP (1) PERCENT SalesOrderID, CustomerID, TotalDueFROM Sales.SalesOrderHeaderORDER BY TotalDue DESC;

SELECT CustomerID, StoreID, TerritoryIDFROM Sales.CustomerWHERE StoreID IS NULLORDER BY TerritoryID

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