SQL – Handling Duplicates Table of content Sometimes, tables or result sets contain duplicate records. While in most cases, duplicates are allowed, there are situations where it is necessary to prevent duplicate records and remove them from a database table. Why is Handling Duplicates in SQL Necessary? Handling duplicates in an SQL database becomes necessary […]
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SQL – Using Sequences Table of content Sequences in SQL are database objects that generate a sequence of unique integer values. They are frequently used in databases because many applications require that each row in a table must contain unique values and sequences provide an easy way to generate them. Sequences are a feature of […]
SQL – Date & Time Table of content SQL provides multiple datatypes and functions to handle Date and Time values in a database. This is because Date and Time values are represented in various formats. For instance, there are two common ways to represent a date value: DD/MM/YYYY and MM/DD/YYYY. Similarly, there is more than […]