The present subject matter relates to determining a set of projections for optimizing query execution on a column-based database. In an example implementation, a plurality of historical queries executed on the column-based database is obtained, and the set of projections is determined based on the plurality of historical queries. The set of projections is determined in a manner such that a total cost of the plurality of historical queries over the set of projections is minimum. The total cost is a sum of a cost of each of the plurality of historical queries. The cost of each historical query is computed based on number of columns in a smallest projection from the set of projections which is used for execution of the respective historical query.
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