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user_profile表: id device_id gender age university province 1 2138 male 21 北京大学 Beijing 2 3214 male 复旦大学 Shanghai 3 6543 female 20 北京大学 Beijing 4 2315 阅读全文
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CITY表: Field Type ID number NAME VARCHAR2(17) COUNTRYCODE VARCHAR2(3) DISTRICT VARCHAR2(20) POPULATION number 1.Revising the Select Query I Query all 阅读全文
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movie Field nameTypeNotes id INTEGER An arbitrary unique identifier title CHAR(70) The name of the film - usually in the language of the first release 阅读全文
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game表: idmdatestadiumteam1team2 1001 8 June 2012 National Stadium, Warsaw POL GRE 1002 8 June 2012 Stadion Miejski (Wroclaw) RUS CZE 1003 12 June 2012 阅读全文
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World Country Profile: Aggregate functions This tutorial is about aggregate functions such as COUNT, SUM and AVG. An aggregate function takes many val 阅读全文
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This tutorial looks at how we can use SELECT statements within SELECT statements to perform more complex queries. namecontinentareapopulationgdp Afgha 阅读全文