Here's a table summarizing the number of input, output, and reject links supported by the Join, Lookup, and Merge stages in IBM DataStage:
| Stage | Input Links | Output Links | Reject Links |
|---|---|---|---|
| Join | Up to 64 input links | 1 output link | Not applicable |
| Lookup | 1 primary input link, up to 128 reference links | 1 output link | 1 reject link (optional) |
| Merge | 1 master input link, up to 128 update links | 1 output link | Not applicable |
This should help clarify how many links are supported for each stage.
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