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SQL Union all VS SSIS Union All

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I have 4 source SQL queries which is pointing different db's in the same server. All 4 queries results need to stored in single SQLServer table of different server. which one is best approach mentioned in below ?

1) Writing SP using union all option with all four source queries and use this sp in single data flow task[single source and destination tasks].

2) 4 source tasks to execute the 4 sql queries and then use Union all transformation to club the result and then one destination.

3) 4 different data flow task. Each data flow task point the different souurce queries and the same destination.

Please suggest in all aspects.


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