Does an index where the last column is unique and already indexed make sense?
50167
Is there any reason for an index to contain the primary key?
67150
Index with exercise numbers
67785
Creating duplicate features based on many-to-one conversion of related table?
17186
How to get only the unique results without having to sort data?
50612
SQL Server - how to determine if indexes aren't being used?
49437
Does the order of columns in a covering index matter?
5073
How can I force MySQL to IGNORE ALL indexes?
121962
How to make unique check without creating heavy index in postgres
44049
How can I find last row that contains data in a specific column?
25897
Custom unique constraint, only enforced if one column has a specific value
58229
Is a table without a primary key normalized?
18537
Why using IN(...) when selecting on indexed fields, will kill the performance of SELECT query?
108071
Find unique columns and column membership
96918
How to use index for simple time range join?
106899
Does the order of columns in a columnstore index matter?
16236
Is it possible to enforce unique values in a column, excluding nulls?
92275
Is it bad math style to use the same index symbol in different indexed objects?