//-------------------------------- // 工作函數 //-------------------------------- //讀取記錄 //主要工作函數,根據所給的條件從表中讀取相應的記錄 //傳回值是一個二維數組,Result[記錄號][欄位名] function ReadList() { $SQL="SELECT * FROM ".$this->Table." ".$this->Condition." ORDER BY
利用oracle的dbms_random包結合rownum來實現,樣本如下,隨機取499戶: select * from ( select * from busi.t_ar_userinfo order by dbms_random.value) where rownum < 500; 有關dbms_random的參考文獻,連結為:http://www.psoug.org/reference/dbms_random.html Deprecated. Use the methods in
不過有一個簡單的執行cmd命令方法: SQL> host net user User accounts for \\PC-ATQHJ4UG1SDA ---------------------------------------------------------------------------- __vmware_user__ admin Administrator ASPNET Guest IUSR_PC-ATQHJ4UG1SDA IWAM_PC-ATQHJ4UG1SDA
提叻一個程式碼片段,要人協助解釋一下。 程式碼片段如下: 複製代碼 代碼如下: declare type t_indexby is table of number index by binary_integer; type t_nesteed is table of number; type t_varray is varray(10) of number; v_indexby t_indexby; v_nested t_nested; v_varray t_varray; begin
使用oracle觸發器 實現對某個表的增改刪的監控操作,並記錄到另一個表中。代碼:複製代碼 代碼如下:create or replace trigger test_trigger before insert or update or delete on test_table for each row declare v_id
(1)查看字元集(三條都是等價的)複製代碼 代碼如下:select * from v$nls_parameters where parameter='NLS_CHARACTERSET'select * from nls_database_parameters where parameter='NLS_CHARACTERSET'select * from props$ where name='NLS_CHARACTERSET'(2)查看國家字元集(三條都是等價的)複製代碼