Question Regarding Data Migration in SQL

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I got a task of data migration. There are around 9 base table and I have to load data using these table to respective table in another database.
eg Account table is my base table and has 9 column.
Column C1,C2,C3 has to store in table1,
C4,C5,C6 has to store in table2 and
C7,C8,C9 has to be stored in table3.
If data already exist in table 1,2,3 do not upload it otherwise insert new record

Similarly I have 9 base table from which I need to migrate respective data to 24 table.

Can you suggest me a way how to do this migration?

First I thought of calling 3 merge statement under 1 stored procedure using CASE statment but this is giving me a syntax error. so I now I have to create 3 Stored Proc for
3 merge statment. This will be so length as I have to this for rest 24 table too.

SQL

MERGE [INTO] <target table>
USING <source table or table expression>
ON <join/merge predicate> (semantics similar to outer join)
WHEN MATCHED <statement to run when match found in target>
WHEN [TARGET] NOT MATCHED <statement to run when no match found in target>

Is there any other way to do data migration ? any suggestion will be helpful.

Posted 11-Sep-12 11:54am

sonal_1785

Updated 11-Sep-12 11:59am

Kenneth Haugland

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Kenneth Haugland 11-Sep-12 18:24pm

WHat other database. MS Access, old version of SQL?

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Kuthuparakkal · Accepted Answer · 2012-09-11T15:52:00

Do all preparation on your source machine and copy all the new tables to destination.

if Table1 does not exist:

SQL

SELECT C1, C2, C3 
  INTO [Table1] -- Assuming Source is SQL server !!!
FROM [Account Table]

if Table1 does exist:

SQL

INSERT INTO [Table1](C1, C2, C3)
SELECT C1, C2, C3
FROM [Account Table] A
LEFT OUTER JOIN [Table1] T1 -- JOIN to check existing rows
ON A.C1 = T1.C1 -- check existing rows, modify according to your definition on duplicate
OR A.C2 = T1.C2  -- check existing rows, modify according to your definition on duplicate
OR A.C3 = T1.C3  -- check existing rows, modify according to your definition on duplicate
WHERE T1.C1 IS NULL OR T1.C2 IS NULL OR T1.C3 IS NULL -- block existing rows

Now do repeat for reamaining tables...
Copy all such prepared tables to destination.