A quick introduction to the new Merge Keyword in SQL 2008

Basic logic behind the Merge Keyword Breakdown the Syntax Lets see it in action Q & A Next Steps

Basic logic behind the Merge Keyword

Breakdown the Syntax

Lets see it in action

Q & A

Next Steps

Senior Systems Designer for Cybner Computer Solutions who specialise in Microsoft Dynamics CRM Implementation & Integration > 10 Years experience in the IT industry

Senior Systems Designer for Cybner Computer Solutions who specialise in Microsoft Dynamics CRM Implementation & Integration

> 10 Years experience in the IT industry

Basic Upsert process Insert New Rows Update Existing Rows Delete removed Rows

Basic Upsert process

Insert New Rows

Update Existing Rows

Delete removed Rows

[ WITH <common_table_expression> [,...n] ] MERGE [ TOP ( expression ) [ PERCENT ] ] [ INTO ] target_table [ [ AS ] table_alias ] [ WITH ( <merge_hint> ) ] USING <table_source> ON <search_condition> [ WHEN MATCHED [ AND <search_condition> ] THEN <merge_matched> ] [ WHEN [TARGET] NOT MATCHED [ AND <search_condition> ] THEN <merge_not_matched> ] [ WHEN SOURCE NOT MATCHED [ AND <search_condition> ] THEN <merge_ matched> ] <output_clause> [ OPTION ( <query_hint> [ ,...n ] ) ] ;

[ WITH <common_table_expression> [,...n] ]

MERGE

[ TOP ( expression ) [ PERCENT ] ]

[ INTO ] target_table [ [ AS ] table_alias ]

[ WITH ( <merge_hint> ) ]

USING <table_source>

ON <search_condition>

[ WHEN MATCHED [ AND <search_condition> ] THEN <merge_matched> ]

[ WHEN [TARGET] NOT MATCHED [ AND <search_condition> ] THEN <merge_not_matched> ]

[ WHEN SOURCE NOT MATCHED [ AND <search_condition> ] THEN <merge_ matched> ]

<output_clause>

[ OPTION ( <query_hint> [ ,...n ] ) ]

;

MERGE DESTINATION USING (This Source Data) ON this join When Matched (exists in both tables) Do Something – probably Update When Not Matched (A new record) Do Something like Insert When Source Not Matched (Row has been deleted from source table) Do Something like Delete from Destination OUTPUT ;

MERGE DESTINATION

USING (This Source Data) ON this join

When Matched (exists in both tables)

Do Something – probably Update

When Not Matched (A new record)

Do Something like Insert

When Source Not Matched (Row has been deleted from source table)

Do Something like Delete from Destination

OUTPUT ;

Solves some of the complex problems with populating a data warehouse No knowledge of SSIS is needed Cleaner code Easy way to log the results of the Merge statement Makes it easier to create data warehouses which in turn can provide a basis for better business intelligence & analysis

Solves some of the complex problems with populating a data warehouse

No knowledge of SSIS is needed

Cleaner code

Easy way to log the results of the Merge statement

Makes it easier to create data warehouses which in turn can provide a basis for better business intelligence & analysis

Over to you…

Over to you…

Best Resources for SQL 2008 resources: Google!!! Search what you are trying to do http://www.sqlservercentral.com/ http://msdn.microsoft.com/en-us/library/bb522522(SQL.100).aspx Download the latest CTP & Start Playing!! More info on me: http://blog.cybner.com.au/ http://www.twitter.com/ceibner

Best Resources for SQL 2008 resources:

Google!!! Search what you are trying to do

http://www.sqlservercentral.com/

http://msdn.microsoft.com/en-us/library/bb522522(SQL.100).aspx

Download the latest CTP & Start Playing!!

More info on me:

http://blog.cybner.com.au/

http://www.twitter.com/ceibner