23 lines
901 B
SQL
23 lines
901 B
SQL
-- storage-common/qgsql/graph/tables.sql
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-- a simple generic RDF-like graph storage using only one tabel
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create sequence steps_id_seq start with 11;
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-- note: bootstrap rows get explicit IDs
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create table steps (
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id bigint not null primary key default nextval('steps_id_seq'),
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item bigint not null,
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property bigint not null references steps,
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valtype smallint not null check (valtype in (0, 1, 2, 3)),
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-- 0 = Nothing, 1 = Text, 2 = Number, 3 = Step
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numval bigint, -- null except for valtype 2 and 3
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strval text -- null except for valtype 1
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);
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-- indexes
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create index idx_ipv on steps USING btree (item, property, valtype, numval, strval);
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create index idx_pv on steps using btree (property, valtype, numval, strval);
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-- optional, not used (values make only sense together with a property):
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--create index idx_vi on steps using btree (valtype, numval, strval, item);
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