java ejb開發(fā) 程序4、語句alter TABLE people add(phone_number varchar2(10)) 的作用是 A 修改表結(jié)構(gòu) B 為people表添加約束，約束名稱是phone_number C 向people表中添加一列，名稱是phone_number，數(shù)據(jù)類型是varchar2，長(zhǎng)度是10 D 上述答案均不正確 5、（ ）BLOB和CLOB的區(qū)別在于 A CLOB只能存放字符類型的數(shù)據(jù)，而BLOB沒有任何限制 B BLOB只能存放字符類型的數(shù)據(jù)，而CLOB沒有任何限制 C CLOB只能存放小于4000字節(jié)的數(shù)據(jù)，而BLOB可以存放大于4000字節(jié)的數(shù)據(jù) D BLOB只能存放小于4000字節(jié)的數(shù)據(jù)，而CLOB可以存放大于4000字節(jié)的數(shù)據(jù) 6、存儲(chǔ)過程從本質(zhì)上來講就是 A 匿名的PL/SQL程序塊，它可以被賦予參數(shù) B 命名的PL/SQL程序塊，它可以被賦予參數(shù) C 命名的PL/SQL程序塊，不能被賦予參數(shù) D 匿名的PL/SQL程序塊，不能被賦予參數(shù) 7、（ ）下列關(guān)于日期數(shù)據(jù)類型，哪一個(gè)語句是正確的寫法 A insert into test values( 9999-12-03 ) B insert into test values( 1999-03-02 ) C insert into test values(to_char(1999-06-03, yyyy/dd/mm )) D insert into test
gperiodic is a program for browsing the periodic TABLE and looking up data for different elements. It also features a non-graphical interface. gperiodicOrb是一個(gè)瀏覽元素周期表和查詢不同元素的數(shù)據(jù)的程序。它有一個(gè)非圖形化的界面。
Setting and Changing Column Widths
By default, all columns in a TABLE start out with equal width, and the columns automatically fill the entire width of the TABLE. When the TABLE becomes wider or narrower (which might happen when the user resizes the window containing the TABLE), all the column widths change appropriately.
SelectionDemo also has code (not included in the preceding snippet) that changes the TABLE s selection orientation. By changing a couple of boolean values, you can make the TABLE allow either column selections or individual cell selections, instead of row selections.
