SQL COUNT() with DISTINCT - w3resource
Create table by using SQL statements in Oracle 12c – FahmidasClassroom
oraclesql SQL- query to find out the distinct values from two tables
DISTINCT in Oracle | Examples to Use DISTINCT in Oracle
Oracle UNIQUE Constraint | How UNIQUE Constraint Works? Examples
SQL Performance: SELECT DISTINCT versus GROUP BY - Stack Overflow
Oracle Distinct | Oracle Distinct Clause By Microsoft Awarded MVP - oracle tutorial - Learn in 30sec | wikitechy - sql tutorial
SQL Unique Constraints
database - "NUM DISTINCT" in Oracle Column Properties - Stack Overflow
How to view table foreign keys (FKs) in Oracle SQL Developer - Oracle SQL Developer Tutorials
Overview of the SQL Count Distinct Function
Oracle Unique | Unique - By Microsoft Awarded MVP - oracle tutorial - Learn in 30sec | wikitechy - sql tutorial
LessThanDot - Unique index difference between Oracle and SQL Server
hint 'leading' 'ordered' issue when using 'count(distinct xxx)' - Oracle Forums
DISTINCT in Oracle | Examples to Use DISTINCT in Oracle
Oracle Distinct | Oracle Distinct Clause By Microsoft Awarded MVP - oracle tutorial - Learn in 30sec | wikitechy - sql tutorial
Data Modeler Concepts and Usage
hint 'leading' 'ordered' issue when using 'count(distinct xxx)' - Oracle Forums
Defining Constraints within CREATE TABLE in Oracle 12c
