Leonid__Libkin
A Query Language for Multidimensional Arrays: Design, implementation, and Optimization Techniques
A Relational Algebra for Complex Objects based on Partial Information
Aggregate Functions, Conservative Extension, and Linear Orders
Aggregation in Constraint Databases
Conservativity of Nested Relational Calculi with Internal Generic Functions
Incremental recomputation of recursive queries with nested sets and aggregate functions
Logics with counting and local properties
Normalizing Incomplete Databases
On the forms of locality over finite models
Query languages for bags
Query languages for bags and aggregate functions
Semantic representations and query languages for or-sets
Some properties of query languages for bags
Variable independence, quantifier elimination, and constraint representations