SQL chu xue zhe zhi nan

Ben shu jie shao le 3 zhong guang fan shi yong de shu ju ku yu fa, Ta men shi:Microsoft SQL Server, MySQL he Oracle. Zhuan men de"shu ju ku de cha yi"ban kuai ze zhan shi le 3 zhong shu ju ku yu fa de bu tong zhi chu. Zhu yao bao kuo le guan xi xing shu ju ku he SQL;Ji ben shu ju jian suo;Ji suan he bie ming deng nei rong.