n IBM DataStage, the number of input and output links varies for the Join, Lookup, and Merge stages.
Join Stage
Input Links: Up to 64 input links.
Output Links: 1 output link.
Lookup Stage
Input Links:
1 primary input link (the data stream you're enriching).
Multiple reference input links (the lookup tables), up to 128.
Output Links:
1 output link for the enriched data.
1 reject link (optional) for rows where the lookup fails.
Merge Stage
Input Links:
1 master input link.
Up to 128 update input links.
Output Links: 1 output link.
These stages are designed to handle different types of data integration scenarios, each with its own strengths.
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