CREATE TABLE Activity (activityno NUMBER NOT NULL, activityname VARCHAR2 (20) NULL, activitytime DATE NULL, activityplace VARCHAR2 (20) NULL, activitycost NUMBER (7,2) NULL, introductions LONG VARCHAR NULL, activitytype VARCHAR2 (20) NULL) CREATE UNIQUE INDEX XPKActivity ON Activity (activityno ASC) - create a unique constraint

ERWIN自动生成代码解析.doc

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