I have an entity which requires both Email and Title to be unique. What's the diff between [Index(nameof(Email), IsUnique = true), Index(nameof(Title), IsUnique = true)] and [Index(nameof(Email), nameof(Title), IsUnique = true)]?
Entity Framework Core 7 index attribute usage for multiple unique columns
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The second one (the
[Index(nameof(Email), nameof(Title), IsUnique = true)]one) will generate the composite index which will check uniqueness across multiple columns, i.e.Email+Titlepair will be checked for uniqueness, not the individual columns while the first one ([Index(nameof(Email), IsUnique = true), Index(nameof(Title), IsUnique = true)]) will create 2 indexes both unique for corresponding single columns.