This chapter describes SQL queries and subqueries. This chapter contains these sections:

QUERIES in Oracle: Select, Insert, Update, Delete, Drop, Alter table, and Create are the few queries among many that can be executed in an Oracle database.

After completing this series, you will have the ability to write complex SQL statements to query data and manage database objects. Section 1. Querying data. This section guides you …

Oct 24, 2025 · Oracle Queries: Basic - Exercises, Solution: Display various datetime format, date time operation and more.

This script explains the plan for a query of the sh.sales and sh.products tables. Both statements must be executed at the same time in order to get the proper plan.

PRIOR clause, which defines how the current row (child) relates to a prior row (parent). In addition, the START WITH clause can be used to define the root node (s) of the hierarchy. …

This tutorial shows you how to use Oracle SELECT statement to retrieve data from one or more columns of a table.

Oracle SQL Developer provides a SQL Worksheet that you can use to query data, by writing simple or complex SQL statements. In this How-To, we look at the most basic of these, select …

This tutorial shows you how to use the Oracle subquery to construct more readable queries without using complex joins or unions.

Discover various methods to list tables in Oracle, from those owned by the current user to all accessible tables. Start enhancing your database management.