Query 2 will run based on the Query1 output - ssis

Question

The Execute SQL Task will provide us database list. Based on the list Query2 should run on all the database.
Query1 result :
databasename1
databasename2
databasename3
Query 2:
step 1
select * from databasename1.dbo.tablename
step 2
select * from databasename2.dbo.tablename
step 3
select * from databasename3.dbo.tablename
How can I use the results of a query to power subsequent queries? In my case, change the catalog name,

Answer 1

You can do this by using a Foreach Loop Container.
You'll need the following control flow:
Execute SQL Task -> Foreach Loop Container and another Execute SQL Task inside the container.
You'll need two variables:
DatabaseList (Object)
DatabaseName (String)
List the databases with a SQL Task
Create a user variable with Object type (DatabaseList)
On the General pane, set the ResultSet property to Full result set
On the Result Set pane set the add a new line (Result Name = 0, Variable Name = User::DatabaseList)
This will query the databases and stores the list in an object.
Note There should be one database name in one record in the first Execute SQL Task's query. Each record will be processed by the Foreach Loop.
Add a Foreach Loop Container after the SQL Command Task
On the Collection pane set the Enumerator to Foreach ADO Enumerator
Select User::DatabaseList as the ADO object source variable
On the Variable Mappings pane add a new entry (Variable = User::DatabaseName, Index = 0)
Add an Execute SQL Task inside the Foreach Loop Container and set up as normally.
Set the ResultSet property to None on the General pane.
Copy the Query to the clipoard.
Highlight the SQL Task inside the Container, then press F4 (opens the property tab).
Add a new expression which sets the SqlStatementSource property. As the Expression add an expression which returns the query with the database (based on the User::DatabaseName).
You can use expressions to dynamically set some the properties of an object. (This method also works with a Data Flow Task just the property to set (with the expression) could be different)
Note If you want to use DFT, then the tables should have the same structure (the meta data of the columns returned by the query should be the same in SSIS)