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Developer-C 11.1
3.0
4.0
10.2
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5.5
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11g Release 2
18c
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8.4
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10
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16
3.8
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3.27
3.39
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2.11
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Sakila
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Help with an interesting Postgres question:
Why isn't an Index Only Scan used on a partition accessed via the parent table?
.
CREATE TABLE product ( sku TEXT NOT NULL, name TEXT NOT NULL, price NUMERIC NOT NULL, quantity NUMERIC NOT NULL, CONSTRAINT product_PK PRIMARY KEY (sku), CONSTRAINT product_AK UNIQUE (name), CONSTRAINT valid_price_CK CHECK (price > 0), CONSTRAINT valid_quantity_CK CHECK (quantity > 0) ); CREATE TABLE product_item_number ( sku TEXT NOT NULL, item_number TEXT NOT NULL, CONSTRAINT product_item_number_PK PRIMARY KEY (sku), CONSTRAINT product_item_number_AK UNIQUE (item_number), CONSTRAINT product_item_number_TO_product_FK FOREIGN KEY (sku) REFERENCES product (sku) );