ORACLE-BASE - WITH Clause: Subquery Factoring in Oracle.
This Oracle tutorial explains how to use the IF-THEN-ELSE statement in Oracle with syntax and examples. In Oracle, the IF-THEN-ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE.
The WITH clause, or subquery factoring clause, is part of the SQL-99 standard and was added into the Oracle SQL syntax in Oracle 9.2. The WITH clause may be processed as an inline view or resolved as a temporary table. The advantage of the latter is that repeated references to the subquery may be more efficient as the data is easily retrieved.
This Oracle tutorial explains how to use Oracle subqueries with syntax and examples. In Oracle, a subquery is a query within a query. You can create subqueries within your SQL statements. These subqueries can reside in the WHERE clause, the FROM clause, or the SELECT clause. Most often, the subquery will be found in the WHERE clause.
Pl sql libraries are Used to share the code across the modules.These are stored in PLL files.When PLL file is compiled, PLX file is generated.
Add a Second Worksheet. When you have a list of your employees you might want to add a sheet with the associated departments. In this case you need to remember the file handle, so you can add the second sheet to the correct file.
SQL Interview Questions (few questions are repeated with small differences in their answers) What Is SQL? SQL (pronounced as the letters S-Q-L or as sequel) is an abbreviation for Structured Query Language. SQL is a language designed specifically for communicating with databases. SQL is designed to do one thing and do it well—provide you with.
Oracle tutorial of w3resource is a comprehensive tutorial to learn Oracle database. Currently we have covered Oracle 11g with thousands of examples, pictorial presentation, explanation and more.
