opm table 414a

c 中虚函数是通过一张虚函数表(virtualtable)来实现的,在这个表中

889_414

添加字段altertable表名add字段名数据类型[位置]altertable表名add

笛卡尔积现象如下实验:select*fromemp;select*fromdept;createtable

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