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The table that follows summarizes Oracle built-in datatypes.
Please refer to the syntax in the preceding sections for the syntactic elements.
In my 18-plus years of T-SQL experience, the MERGE statement has got to be one of the most difficult statements I have had to implement.
It is powerful and multifunctional, yet it can be hard to master.
A large object (LOB) is a special form of scalar datatype representing a large scalar value of binary or character data.
Both fixed-width and variable-width character sets are supported, both using the database character set.
The comments in the T-SQL code will help to explain what is happening throughout the statement. select Source System ID, Attribute1, Attribute2, Attribute3, Dimension Check Sum, Effective Date, End Date from ( -- This is the beginning of the merge statement. Current Record='Y' THEN UPDATE SET End Date=getdate()-1, Current Record='N', Last Updated=getdate(), Updated By=suser_sname() -- If the ID's do not match, then the record is new; -- therefore, insert the new record into the target using the values from the source. Also, notice how the Dimension Check Sum column is different between Surrogate Keys 2 and 5.
-- The target must be defined, in this example it is our slowly changing -- dimension table MERGE into Dim SCDType2Example AS target -- The source must be defined with the USING clause USING ( -- The source is made up of the attribute columns from the staging table. Source System ID ) -- If the ID's match but the Check Sums are different, then the record has changed; -- therefore, update the existing record in the target, end dating the record -- and set the Current Record flag to N WHEN MATCHED and target. WHEN NOT MATCHED THEN INSERT ( Source System ID, Attribute1, Attribute2, Attribute3, Dimension Check Sum ) VALUES ( source. Furthermore, the End Date for Surrogate Key 2 has changed from 12/31/9999 to 01/27/2013 and the Current Record is set to 'N'.
The codes listed for the datatypes are used internally by Oracle Database.
The datatype code of a column or object attribute is returned by the DUMP function.
Those restrictions are documented in the context of the relevant SQL syntax.