Hi @ll,@ll, how can I append a value to an existing value? I want to look up a value from a column_1 in a column_2 and everytime there's a match it should write a specific value to a column_3. The tricky part (for me right now) is that, if an observation already got a specific value in column_3, the new match should append at the end of the first match with a "-". Example: In the final Table_1, I could use the "Block_done_with_scan" variable to mark all values in V1 and V2 as belonging to specific code 42. Table_0: Table_1: V1 | V2 V1 | V2 | Match | Block_done_with_scan 1 | 2 1 | 2 | 42-42 | 42 2 | 1 2 | 1 | 42 | 42 2 | 2 2 | 2 | 42-42 | 42
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