Any algorithm needs data. And the richer the data are, the happier the algorithm is. Especially in the field of health care, using several health data sources makes it possible to build rich patients pathways well suited for feeding algorithms. However, many issues may arise when linking heath databases, such as missing information, assessment of results or volumetry bottlenecks. We will present here a new record linkage approach and some use cases including the French National Health Insurance Information System (SNDS).