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@@ -59,7 +59,7 @@ CREATE TABLE arrival(time_of_day TIME,
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week_day INTEGER,
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tram_line INTEGER,
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direction BOOLEAN
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CONSTRAINT ck PRIMARY KEY (week_day,tram_line)
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PRIMARY KEY (week_day,tram_line)
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CONSTRAINT in_week CHECK (week_day >= 0 AND week_day <= 6)
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CONSTRAINT valid_line CHECK (tram_line >= 1 AND tram_line <= 4)
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);
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