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PL/SQL Records A record is a collection of data objects that are kept in fields, each having its own name and data type. A record can be thought of as a variable that can store a table row or a set of columns from a table row. Table columns relate to the fields. Records are made...
SQL-PLSQL SQLandPl/SQL培训文档 作者：周胜杰2006-10-25 汉得信息技术有限公司® 第一天 第一章PL/SQL简介 第二章PL/SQL数据类型第三章PL/SQL控制结构第四章PL/SQLCollectionsandrecords第五章游标练习 汉得信息技术有限公司® 第一章PL/SQL简介 SQL(StructureQueryLanguage):是对关系型数据库(RDBMS)...
‘ 342 and course = 101) 343 for update of current_credits; -- one column 344 345 begin 346 for v_studentInfo in c_RegisteredStudents 347 loop 348 select num_credits 349 into v_NumCredits 350 from classes 351 where department = 'HIS' 352 and course = 101; 353 354 update students ...
v_sql VARCHAR2(200):='SELECT t.course_name, t.course_desc FROM demo.t_course t'; 1. 2. 早期Oracle 提供了DBMS_SQL包来执行动态 SQL 语句,后来又提供了本地动态 SQL(Native Dynamic SQL),用来代替DBMS_SQL执行动态 SQL 语句。使用本地动态 SQL 比使用DBMS_SQL更简单,且大部分情况比DBMS_SQL更高效...
pstgresql 定义变量 plsql定义变量并赋值 PL/SQL作为对SQL的过程化补充,允许通过对变量,过程和事物等数据库对象进行数据操作实现SQL编程 SQL中的对象包括 存储过程、表、视图、函数、触发器。。。等 一、PL/SQL编程 1、 变量 变量时PL/SQL中存储单个数据的基本单元 创建变量...
PLSQL详解 1. &与&&的区别: 一个&的意思 是每次碰到这个变量,都问问你是啥 两个&,那么只问你一次,以后这个变量都按这个值处理 2.声明常量 eg: declare testConstant CONSTANT NUMBER :=300 begin end; 3. IF语句 IF CONDITION1 THEN STATEMENT 1;...
I want the changed code to be as much like the view as possible, so the view uses existing columns as placeholders for the macro parameters and I simply put a “P_” prefix in front. Of course, the names in the view and in the macro have to be coordinated. Here’s the view. It...
BOOLEAN表达式是PL/SQL语言中很常用的一种表达式类型,它用于比较两个条件,来确定其是否为真或假。 在PL/SQL中,BOOLEAN表达式可以用于条件判断或在循环语句中作为终止条件。其语法非常简单,只需要使用逻辑运算符对两个条件进行比较。PL/SQL支持的逻辑运算符有AND、OR和NOT三种,这些运算符可以将结果组合成更复杂的布尔...