tDBInput -> Select some value rows -> tDBInput using extracted values
But I have managed this in below way
tDBInput -> tFlowToIterate -> tFixedFlowInput -> tSetGlobalVar -> ChildJob(Contains the second tDBInput)
Since there are over 200 columns i need to specify 200 global variables and this is a batch job that runs every single minute. So the data load is huge(not sure this way will consume more resources)