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SQL Basics - II
Non-correlated Sub query
USE AdventureWorks
SELECT SalesPersonID,
SalesQuota CurrentSalesQuota
FROM Sales.SalesPerson
WHER...
UNION
USE AdventureWorks
SELECT SalesPersonID, GETDATE() QuotaDate,
SalesQuota FROM Sales.SalesPerson
WHERE SalesQuota > 0...
Combining Result Sets
with UNION
•The UNION operator is used to append the results of two or
more SELECT statements into a...
Table Valued Function
USE AdventureWorks
GO
CREATE FUNCTION dbo.fn_WorkOrderRouting
(@WorkOrderID int) RETURNS TABLE
AS
RE...
Using CROSS APPLY
USE AdventureWorks
GO
SELECT
w.WorkOrderID,w.OrderQty,r.ProductID,r.OperationSequence
FROM Production.Wo...
APPLY
•APPLY is used to invoke a table-valued function for each row
of an outer query
•CROSS APPLY works like an INNER JOI...
EXCEPT and INTERCEPT
-- First two new tables based on ProductionProduct will be created
USE AdventureWorks
GO
SELECT prod....
Create second table
USE AdventureWorks
GO
-- Create TableB
SELECT prod.ProductID,
prod.Name
INTO dbo.TableB
FROM
(SELECT P...
EXCEPT
USE AdventureWorks
GO
SELECT ProductID,
Name
FROM TableA
EXCEPT
SELECT ProductID,
Name
FROM TableB
INTERSECT
USE AdventureWorks
GO
SELECT ProductID,Name
FROM TableA
INTERSECT
SELECT ProductID,Name
FROM TableB
CUBE
USE AdventureWorks
GO
SELECT i.Shelf,
SUM(i.Quantity) Total
FROM Production.ProductInventory i
GROUP BY i.Shelf
WITH ...
What is CUBE ?
•WITH CUBE is used to aggregate values for each
grouping combination
•WITH CUBE is often used for reporting...
GROUPING with CUBE
USE AdventureWorks
GO
SELECT i.Shelf,
GROUPING(i.Shelf) Source,
SUM(i.Quantity) Total
FROM Production.P...
ROLLUP
USE AdventureWorks
GO
SELECT i.Shelf, p.Name,
SUM(i.Quantity) Total FROM Production.ProductInventory i
INNER JOIN P...
What is ROLLUP ?
WITH ROLLUP is used in conjunction with GROUP BY to add
hierarchical data summaries based on the ordering...
HINTS
•SQL Server’s query optimization process is
responsible for producing a query execution plan when
a SELECT query is ...
JOINT Hints
A join hint will force the query optimizer to join the
tables in the way you command
JOIN without hint
USE AdventureWorks
GO
SET SHOWPLAN_TEXT ON
GO
SELECT p.Name,r.ReviewerName,r.Rating
FROM Production.Prod...
JOIN with hint
USE AdventureWorks
GO
SET SHOWPLAN_TEXT ON
GO
SELECT p.Name,r.ReviewerName,
r.Rating
FROM Production.Produc...
Query with hint
USE AdventureWorks
GO
SELECT SalesOrderID,
ProductID,
UnitPrice,
OrderQty
FROM Sales.SalesOrderDetail
WHER...
Table hint
USE AdventureWorks
GO
SELECT DocumentID,
Title
FROM Production.Document
WITH (NOLOCK)
WHERE Status = 1
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Sql basics 2

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Transcript of "Sql basics 2"

  1. 1. SQL Basics - II
  2. 2. Non-correlated Sub query USE AdventureWorks SELECT SalesPersonID, SalesQuota CurrentSalesQuota FROM Sales.SalesPerson WHERE SalesQuota IN (SELECT MAX(SalesQuota) FROM Sales.SalesPerson)
  3. 3. UNION USE AdventureWorks SELECT SalesPersonID, GETDATE() QuotaDate, SalesQuota FROM Sales.SalesPerson WHERE SalesQuota > 0 UNION SELECT SalesPersonID, QuotaDate, SalesQuota FROM Sales.SalesPersonQuotaHistory WHERE SalesQuota > 0 ORDER BY SalesPersonID DESC, QuotaDate DESC
  4. 4. Combining Result Sets with UNION •The UNION operator is used to append the results of two or more SELECT statements into a single result set •Each SELECT statement being merged must have the same number of columns, with the same or compatible data types in the same order
  5. 5. Table Valued Function USE AdventureWorks GO CREATE FUNCTION dbo.fn_WorkOrderRouting (@WorkOrderID int) RETURNS TABLE AS RETURN SELECT WorkOrderID,ProductID,OperationSequence,LocationID FROM Production.WorkOrderRouting WHERE WorkOrderID = @WorkOrderID GO
  6. 6. Using CROSS APPLY USE AdventureWorks GO SELECT w.WorkOrderID,w.OrderQty,r.ProductID,r.OperationSequence FROM Production.WorkOrder w CROSS APPLY dbo.fn_WorkOrderRouting (w.WorkOrderID) AS r ORDER BY w.WorkOrderID,w.OrderQty,r.ProductID
  7. 7. APPLY •APPLY is used to invoke a table-valued function for each row of an outer query •CROSS APPLY works like an INNER JOIN in that unmatched rows between the left table and the table-valued function don’t appear in the result set •OUTER APPLY is like an OUTER JOIN, in that mismatched rows are still returned in the result set with NULL values in the function results.
  8. 8. EXCEPT and INTERCEPT -- First two new tables based on ProductionProduct will be created USE AdventureWorks GO SELECT prod.ProductID, prod.Name INTO dbo.TableA FROM (SELECT ProductID, Name, ROW_NUMBER() OVER (ORDER BY ProductID) RowNum FROM Production.Product) prod
  9. 9. Create second table USE AdventureWorks GO -- Create TableB SELECT prod.ProductID, prod.Name INTO dbo.TableB FROM (SELECT ProductID, Name, ROW_NUMBER() OVER (ORDER BY ProductID) RowNum FROM Production.Product) prod WHERE RowNum BETWEEN 10 and 29
  10. 10. EXCEPT USE AdventureWorks GO SELECT ProductID, Name FROM TableA EXCEPT SELECT ProductID, Name FROM TableB
  11. 11. INTERSECT USE AdventureWorks GO SELECT ProductID,Name FROM TableA INTERSECT SELECT ProductID,Name FROM TableB
  12. 12. CUBE USE AdventureWorks GO SELECT i.Shelf, SUM(i.Quantity) Total FROM Production.ProductInventory i GROUP BY i.Shelf WITH CUBE
  13. 13. What is CUBE ? •WITH CUBE is used to aggregate values for each grouping combination •WITH CUBE is often used for reporting purposes, providing an easy method of reporting totals by grouped column
  14. 14. GROUPING with CUBE USE AdventureWorks GO SELECT i.Shelf, GROUPING(i.Shelf) Source, SUM(i.Quantity) Total FROM Production.ProductInventory i GROUP BY i.Shelf WITH CUBE
  15. 15. ROLLUP USE AdventureWorks GO SELECT i.Shelf, p.Name, SUM(i.Quantity) Total FROM Production.ProductInventory i INNER JOIN Production.Product p ON i.ProductID = p.ProductID GROUP BY i.Shelf, p.Name WITH ROLLUP
  16. 16. What is ROLLUP ? WITH ROLLUP is used in conjunction with GROUP BY to add hierarchical data summaries based on the ordering of columns in the GROUP BY clause
  17. 17. HINTS •SQL Server’s query optimization process is responsible for producing a query execution plan when a SELECT query is executed •Under rare circumstances SQL Server may choose an inefficient plan over a more efficient one •After researching the query performance, you may decide to override the decision making process of the SQL Server query optimizer by using hints
  18. 18. JOINT Hints A join hint will force the query optimizer to join the tables in the way you command
  19. 19. JOIN without hint USE AdventureWorks GO SET SHOWPLAN_TEXT ON GO SELECT p.Name,r.ReviewerName,r.Rating FROM Production.Product p INNER JOIN Production.ProductReview r ON r.ProductID = p.ProductID GO SET SHOWPLAN_TEXT OFF GO
  20. 20. JOIN with hint USE AdventureWorks GO SET SHOWPLAN_TEXT ON GO SELECT p.Name,r.ReviewerName, r.Rating FROM Production.Product p INNER HASH JOIN Production.ProductReview r ON r.ProductID = p.ProductID GO SET SHOWPLAN_TEXT OFF GO
  21. 21. Query with hint USE AdventureWorks GO SELECT SalesOrderID, ProductID, UnitPrice, OrderQty FROM Sales.SalesOrderDetail WHERE CarrierTrackingNumber = '5CE9-4D75-8F' ORDER BY SalesOrderID, ProductID OPTION (RECOMPILE)
  22. 22. Table hint USE AdventureWorks GO SELECT DocumentID, Title FROM Production.Document WITH (NOLOCK) WHERE Status = 1
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