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SQL (3)
Datové typy
- podle normy podle SQL92 a SQL99
- navíc: geometrické útvary, IP adresy, MAC, ISBN...
- možnost definice vlastních typů
SUBSELECTy
- SELECT COUNT(x), SUM(x) FROM (
SELECT SUM(weight) AS x
FROM Items
GROUP BY manufacturer
) AS Items;