【判断题】USE BookShop Go IF EXISTS (SELECT * FROM SYSOBJECTS WHERE NAME='Member') DROP TABLE Member CREATE TABLE Member (User_ID int PRIMARY KEY NOT NULL, User_Name varchar (50) NOT NULL, User_ char ...
【简答题】说明以下两条SQL语句的输出结果: SELECT EMPNO,COMM FROM EMP WHERE COMM IS NULL; SELECT EMPNO,COMM FROM EMP WHERE COMM = NULL;
【单选题】Declare @x intIf @x is null Select 'A'If @x=0 Select 'B'If @x=' ' Select 'C'
【简答题】请根据注释给代码的空白处填空。 //SQLite查询操作 public Cursor select() { SQLiteDatabase db = this.getReadableDatabase(); Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null, null); return ________; //返回查询的...