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unique index stresses
comp., MS	уникальный индекс (An index in which no two rows are permitted to have the same index value, thus prohibiting duplicate index or key values); однозначный индекс (An index in which no two rows are permitted to have the same index value, thus prohibiting duplicate index or key values)
SAP.tech.	уникальный индекс

unique index : 3 phrases in 2 subjects

Databases	2
Ecology	1