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15 lines
762 B
15 lines
762 B
create view if not exists prov_by_type as
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with
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trades as (select distinct trade_node from provinces where trade_node != ''),
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areas as (select distinct area from provinces where area != ''),
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regions as (select distinct region from provinces where region != '')
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select 'trade_node' as typ, provinces.trade_node as name, name as province, id
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from provinces inner join trades on trades.trade_node = provinces.trade_node
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union
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select 'area' as typ, provinces.area as name, name as province, id
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from provinces inner join areas on areas.area = provinces.area
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union
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select 'region' as typ, provinces.region as name, name as province, id
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from provinces inner join regions on regions.region = provinces.region
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;
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