# Partial key

<database> A key which identifies a subset of a set of information items (e.g. database "records"), and which could narrow the subset to one item if other partial key(s) were combined with it.

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Parsley Partial Differential Equation LANguage partial equivalence relation partial evaluation partial function |
database normalisation partial key |
partially ordered set partial ordering Partial Response Maximum Likelihood partition partitioned data set |