![]() For more information on SQL Server included columns, see the documentation. This can significantly improve query performance when all columns in the query are included in the index either as key or nonkey columns, as the table itself doesn't need to be accessed. Some relational databases allow you to configure a set of columns which get included in the index, but aren't part of its "key". ![]() protected override void OnModelCreating(ModelBuilder modelBuilder) To override this convention you can supply a null value. When using the SQL Server provider EF adds an 'IS NOT NULL' filter for all nullable columns that are part of a unique index. You can use the Fluent API to specify a filter on an index, provided as a SQL expression: protected override void OnModelCreating(ModelBuilder modelBuilder) For more information on SQL Server filtered indexes, see the documentation. This allows you to index only a subset of a column's values, reducing the index's size and improving both performance and disk space usage. Some relational databases allow you to specify a filtered or partial index. Protected override void OnModelCreating(ModelBuilder modelBuilder)
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