安装plsql之前首先需要把下载oracle instant client 解压出来,如下图,比如将压缩包中的instantclient_12_2 文件夹解压到 D:\Program 文件夹 然后直接双击plsql如下图安装文件,默认安装完成即可。 安装完成后,双击如下图plsql启动图标 注册码: Product Code(产品代号):4t46t6vydkvsxekkvf3fjnpzy5wbuhphqz serial...
所有的SQL数据操作语句都可以用于执行部分,PL/SQL块不能在屏幕上显示SELECT语句的输出。SELECT语句必须包括一个INTO子串或者是游标的一部分,执行部分使用的变量和常量必须首先在声明部分声明,执行部分必须至少包括一条可执行语句,NULL是一条合法的可执行语句,事物控制语句COMMIT和ROLLBACK可以在执行部分使用,数据定义语言DDL...
In this chapter, we will discuss the Basic Syntax of PL/SQL which is a block-structured language; this means that the PL/SQL programs are divided and written in logical blocks of code. Each block consists of three sub-parts −S.NoSections & Description 1 Declarations This section starts ...
PL/SQL Basic --PL/SQL块结构DECLARE/**定义部分-定义常量,变量,复杂数据类型,游标。 可选 没有;*/BEGIN/**执行部分-sql语句 必须 没有;*/EXCEPTION/**例外处理部分-处理运行错误 可选 没有;*/END;/*块结束标志 必须;*/setserveroutputonBEGINDBMS_OUTPUT.PUT_LINE('Hello');END;DECLAREv_enameVARCHAR(...
(2)PL/SQL fullysupports SQL data types. You need notconvert between PL/SQL and SQL data types. For example, if your PL/SQL programretrieves a value from a column of the SQL type VARCHAR2, it can storethat value in a PL/SQL variable of the type VARCHAR2. ...
In PL/pgSQL an assignment of a value to a variable is written as: variable:= expression; Here is an example: Examples: tax:= subtotal * 0.04; my_record.user_id := 30; Executing a command with no result There are some SQL commands that does not return rows, for example, INSERT wit...
1. Naming Your Program Data 2. Overview of PL/SQL Datatypes Character Data CHAR and NCHAR are fixed-length datatypes; VARCHAR2 and NVARCHAR2 are variable-length datatypes. PL/SQL has the CLOB (character large object) and NCLOB (National Language Support CLOB) datatypes. For backward compatibilit...
The programming statements that can be used in a PL/SQL application include: assignment, DELETE, EXECUTE IMMEDIATE, INSERT, NULL, SELECT INTO, and UPDATE.
This chapter covers basic reference material on how to write programs in PL/SQL and their examples. PL/SQL allows dependencies between commands within the same block of code. It also allows for parameter passing up and down code block hierarchies. PL/SQL contains a definition of variable scope...
PL/SQL is ablock-structuredlanguage. That is, the basic units (procedures, functions, and anonymous blocks) that make up a PL/SQL program are logical blocks, which can contain any number of nested sub-blocks. Typically, each logical block corresponds to a problem or subproblem to be solved...