# Merge (Date)

### Default
Similar to block `Merge`, but also transports the date in the second column of `B` to both outputs (`A1` and `A2`).
Finds all items in `A` for which the second column matches an object from `B`.
Usually used to merge back objects which have previously been split.

### Input
- `A [OBJ,OBJ]`: a list of pairs to be searched
- `B [OBJ,DATE]`: a list of pairs to be merged with `A`

### Output
- `A1B2 [OBJ,DATE]`: from the first column of `A` only those items of which the second column matched with `B`, and the matching date from the second column of `B`
- `A2B2 [OBJ,DATE]`: items from the second column of `A` that matched with `B` and the matching date from the second column of `B`

Output scores can be [aggregated](docs://score_aggregation) and/or [normalised](docs://score_normalisation).