索引表也称为PL/SQL表,用于处理PL/SQL数组的数据类型.但是索引表与高级语言的数组是有区别的:高级语言数组的元素个数是有限制的,并且下标不能为负值;而索引表的元素个数没有限制,并且下标可以为负值,甚至可以使用VARCHAR2类型. PL/SQL中是没有现成的索引表数据类型的,要使用索引表,必须先进行数据类型定义,其定义...
Tutorial #9:PL SQL Package: Oracle PL/SQL Package Tutorial With Examples Tutorial #10:PL SQL Transactions – COMMIT, ROLLBACK And SAVEPOINT Tutorial #11:Triggers In PL SQL: Tutorial With Example Programs Tutorial #12:PL SQL Datetime Format: Date and Time Functions In PL/SQL Tutorial #13:Co...
在普通SQL语句的使用上增加了编程语言的特点,所以PL/SQL就是把数据操作和查询语句组织在PL/SQL代码的过程性单元中,通过逻辑判断、循环等操作实现复杂的功能或者计算的程序语言。 目录 1基本概念 2变量 3基本语法 4执行操作 ▪过程 ▪函数 ▪管理子程序 ▪开发包 ▪异常处理 5Example 6类似语言 基本概念 ...
for example: Write a validation check to ascertain that all required fields have a value and set a flag called Record Complete to On if they do. Write a validation check that compares the timestamp of the last data update for each unlocked record to the...
Completely updated for Oracle 11g, Oracle PL/SQL by Example, Fourth Edition covers all the fundamentals, from PL/SQL syntax and program control through packages and Oracle 11gs significantly improved triggers. One step at a time, youll walk through every key task, discovering the most important...
SQL> START exampbld...SQL> START examplod Sample 1. FOR Loop The following example uses a simpleFORloop to insert ten rows into a database table. The values of a loop index, counter variable, and either of two character strings are inserted. Which string is inserted depends on the value...
(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. ...
select sql_id, username, osuser, machine, program from v$session where username = 'gavin' 1. 2. 3. Step2. 查看该SQL_ID历史的解析计划变换 select distinct a.instance_number, trunc(b.begin_interval_time, 'mi'), sql_id, plan_hash_value ...
Oracle PL/SQL by Example, Sixth Edition, teaches all the PL/SQL skills you'll need, through real-world labs and extensive examples. Now fully updated for the newest version of PL/SQL 21c, it covers everything from basic syntax and program control through the latest optimization and tuning ...
Let us see another example. Code implementation with IN OUT parameter: DECLARE num number; PROCEDURE addNum(i IN OUT number) IS BEGIN i := i + i; END; BEGIN num := 1; addNum(num); dbms_output.put_line('The sum is ' || num); ...