Clarify unique constraint and index, cannot grasp the concepts to 100%
113750
When should I use a unique constraint instead of a unique index?
75209
Why is `make_unique` disallowed?
83319
Multiple Indexes vs Multi-Column Indexes
4877
Is a composite index also good for queries on the first field?
67785
Creating duplicate features based on many-to-one conversion of related table?
53418
Why finite structures are uniquely characterized?
118030
Two subgroups of the same index must be conjugate under these assumptions
125835
Can't find FULLTEXT index matching the column list (indexes is set)
153827
Why the rows returns by "explain" is not equal to count()?
151620
Multidimensional indices in databases
25897
Custom unique constraint, only enforced if one column has a specific value
77261
numpy.unique with order preserved
82305
Creating an index in both asc and desc directions
54719
How to handle equality constraints in this problem?
58903
How is INDEX on Composite Primary Key in mysql?
59727
Understanding equivalence class, equivalence relation, partition
83888
Why doesn't this array_unique work as expected?