So I have a question about how to do a join to get rows matched up kinda sorta to their similar timestamps.
I've got two tables, one for defect data, one for wafer count through a tool. The timestamps don't match up and not every wafer measured in one table is recorded in the other.
Any tips on how to join this table for the ultimate goal of plotting defect count vs wafer count?
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1.6million rows, ~6months of data
Table 1 - Defect Data
Defect data only measured on a small sample of wafers.
Time stamps only for the in/out, so a single time stamp for the whole lot

Table 2 - Wafer Count
individual wafer time stamps for a larger sampling of wafers.
unique time stamps for each wafer
