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One basic problem faced by central planners, but hardly present in a market system, has to do with
Number Field
An input field in software or a database designed to only contain numerical values.
Self Join
A join in SQL where a table is joined to itself to compare rows within the same table.
Parent Table
A table in a database that has one or more related child tables through a foreign key relationship, establishing a hierarchy.
Child Table
A table in a database that has a foreign key linking to the primary key of another table, known as the parent table.
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