Oracle/PLSQL Built-In Functions 今天发现的一个很不错的网站,对常见函数有个很好的讲解,本来还想自己整理一下,学了这么长时间都没有系统的整理过,看了这个确实不错,值得一看。有不少例子,虽然有些确实很简单,没有必要举例,但是也足以见证笔者的耐心和负责。在此我把这里粘贴过来,不过都是引用的该网站的链接。
Assigning a SQL Query Result to a PL/SQL Variable PL/SQL Expressions and Comparisons Logical Operators Boolean Expressions CASE Expressions Handling Null Values in Comparisons and Conditional Statements Built-In Functions Predefined Datatypes Number Types ...
If you are familiar with UNIX-style regular expressions, you can use them while performing queries and string manipulations. You use theREGEXP_LIKEoperator in SQL queries, and theREGEXP_INSTR,REGEXP_REPLACE, andREGEXP_SUBSTRfunctions anywhere you would useINSTR,REPLACE, andSUBSTR. See Also: "S...
编写PLSQL块验该过程 1declare2v_anumber;--定义变量3v_bnumber;4begin5v_a :=10;--为变量赋值6v_b :=20;7inout_proc(v_a , v_b) ;--调用inout_proc 传递实参进去8DBMS_OUTPUT.PUT_LINE('传递到过程体内的 v_a :'||v_a ) ;--输出在过程体内被修改的值9DBMS_OUTPUT.PUT_LINE('传递到过程...
In this article, we will discuss the subprograms that PL/SQL supports. Also, we shall explore the procedures and functions that are available in PL/SQL. Moreover, we will also touch base on some of the built-in PL/SQL functions.
1.in参数: 用于接收参数,在子程序内部,不能进行修改。当参数没有写模式的时候,默认的参数模式:in。 例如:v_b number,其没有声明 in、out、in out,所以默认为in,in参数,则v_b 不能再在子程序内部修改值。 2.out参数: out参数,输出模式的参数,用于输出值,会忽略传入的值。在子程序内部可以对其进行修改。
If you are using Git or Subversion (SVN) for version control, you can now make use of the built-in version control functions in PL/SQL Developer.The version control status of a file (untracked, added, modified, unchanged, …) will be displayed in window status lines, in File Browser ...
PL/SQL Functions Overview - Explore the essential PL/SQL functions for effective database programming. Learn how to utilize built-in functions to enhance your PL/SQL code.
Extract part of a string.One of the most commonly utilized built-in functions for strings is SUBSTR, which is used to extract a substring from a string. When calling SUBSTR, you provide the string, the position at which the desired substring starts, and the number of characters in the subs...
This Oracle tutorial explains how to use the Oracle / PLSQL LEAD function with syntax and examples. The Oracle / PLSQL LEAD function is an analytic function that lets you query more than one row in a table at a time without having to join the table to it