CountObservation count observation for given entity and variable pair in SQL database.

DateEntityCount returns number of entities (from given candidates) with data for each observation date.

EntityVariableExistence returns all existent entity, variable pairs.

GetImportTableData gets rows of imports table.

GetObservations fetches observations from the specified SQL database.

GetProvenances returns all the provenance name and url in SQL database.

GetStatVarSummaries returns summaries of the specified statvars.

Represents "metadata" column of import table.