作用:escape關鍵字經常用於使某些特殊字元,如萬用字元:'%','_'轉義為它們原來的字元的意義, 被定義的逸出字元通常使用'\',但是也可以使用其他的符號(字母數字也可)。 SQL> SELECT * FROM emp WHERE ename LIKE 'a%%' ESCAPE 'a'; EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO----- ---------- --------- --
一、查詢外鍵對應的表及欄位1、通過下面SQL語句查詢外鍵對應的表及欄位 P代表主鍵 R代表外鍵select a.constraint_name, a.table_name, b.constraint_name from user_constraints a, user_constraints b where a.constraint_type = 'R' and b.constraint_type = 'P' and a.r_constraint_name =
IntroductionIn this article, i will examine how to store and retrieve binary files such as image or PDF into MS SQL or Oracle database. Using the codeReading a File into a Byte Array. Collapse Copy Code byte[] byteArray = null;using
create or replace procedure ecs_customdetail_0929 --建立預存程序 is longerstation VARCHAR2(50); --定義變數 type v_cursor is ref cursor; --變義遊標detailid v_cursor;in_id v_cursor;v_str varchar2(200);in_str varchar2(200);tab_detailid
select myFunc(參數1,參數2..) to dual; --可以執行一些商務邏輯一:Oracle中的函數與預存程序的區別:A:函數必須有傳回值,而過程沒有.B:函數可以單獨執行.而過程必須通過execute執行.C:函數可以嵌入到SQL語句中執行.而過程不行.其實我們可以將比較複雜的查詢寫成函數.然後到預存程序中去調用這些函數.二:如何建立預存程序:A:格式create or replace procedure
A useful feature for any type of programming is the ability to store and use temporary data. Oracle provides us this ability with temporary tables. These temporary tables are created just like any other table (it uses some special modifiers), and
The Oracle server maintains the redo Oracle log files to minimize the loss of data in the Database in case of an uncontrolled shutdown. Online redo Oracle log files are filled with redo records. A redo record, also called a redo entry, is made up of
Oracle 10g Tutorials : Oracle Net ServicesIn this tutorial you will learn Oracle Net Services - An Overview, Using Oracle Net Manager, Creating Listeners, Choosing General Parameters , enable the tracing and logging for the database transactions. We
Oracle Tips by Burleson ConsultingOracle SGA ConceptsThe System Global Area (SGA) is a group of shared memory areas that are dedicated to an Oracle instance?(an instance is your database programs and RAM). All Oracle processes use the SGA to hold