PL/SQL Collections A collection is a group of items that share the same type and are arranged in a particular order. It is a broad term that encompasses lists, arrays, and other data structures commonly used in traditional programming. Each element in a collection is assigned a specific subsc...
PL/SQL stands for Procedural Language extensions to the Structured Query Language (SQL).SQLis a powerful language for both querying and updating data in relational databases. Oracle created PL/SQL that extends some limitations of SQL to provide a more comprehensive solution for building mission-criti...
2.1. The normal rules of arithmetic operator precedence apply in SQL The normal rules of arithmetic operator precedence apply in SQL: multiplication and division are performed first. followed by addition and subtraction. If operators of the same precedence are used, they are performed from left to ...
The syntax for the CREATE TABLE AS statement that copies columns from multiple tables in Oracle/PLSQL is: CREATE TABLE new_table AS (SELECT column_1, column2, ... column_n FROM old_table_1, old_table_2, ... old_table_n);
This Oracle tutorial explains how to use the Oracle INSERT statement with syntax, examples, and practice exercises. The Oracle INSERT statement is used to insert a single record or multiple records into a table in Oracle.
The set operators union, intersect, and minus allow you to combine many tables into one. This tutorial will use these two tables for the queries: select*frommy_brick_collection;select*fromyour_brick_collection; Module2 Union The union operator combines two or more tables into a single result ...
(EMPNO, Jobtitle) values (6,'Mediator'); 1 row created. SQL> insert into job (EMPNO, Jobtitle) values (7,'Proffessor'); 1 row created. SQL> insert into job (EMPNO, Jobtitle) values (8,'Programmer'); 1 row created. SQL> insert into job (EMPNO, Jobtitle) values (9,'Developer'...
PL/SQL Tutorial This PL/SQL Tutorial section teaches you how to use PL/SQL programming language to develop modular and procedural programs in Oracle Database. Oracle Aggregate Functions This tutorial helps you understand how the Oracle aggregate functions work and show you how to use them to calc...
Oracle SQL Plus常用命令 set linesize 200 set linesize 可以设置一行的字符数,默认为80个字符。 set linesize 200,表示设置一行为200个字符。 l(List) 可以显示缓存区中的最后执行的内容。 run / r 以上三个命令功能是一致的,重新运行缓存区中的语句。
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