A quick introduction to the new Merge Keyword in SQL 2008

1. Basic logic behind the Merge Keyword2. Breakdown the Syntax3. Lets see it in action4. Q & A5. Next Steps

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

[ 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 DESTINATIONUSING (This Source Data) ON this joinWhen Matched (exists in both tables)

Do Something – probably UpdateWhen Not Matched (A new record)

Do Something like InsertWhen 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

Over to you…

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bb522522(SQL.100).aspx Download the latest CTP & Start Playing!!

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