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Working with Dates in SQL

Last Updated: 13 February 2026

SQL provides built-in date functions to extract and manipulate parts of a date value. These functions help analyze and organize time-based data efficiently.Functions like ...read more

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Data Cleaning in SQL

Last Updated: 13 February 2026

Data cleaning is the process of preparing raw data by correcting errors, handling missing values and removing inconsistencies. It ensures that data is accurate and suitabl...read more

Dealing with Duplicate Data Points in an SQL Query

Last Updated: 19 January 2026

Duplicate data points in SQL mean that the same record appears more than once in a table. Handling duplicates is important because they can give wrong results, increase d...read more

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SQL Query to find Employees With Higher Salary than Their Department Average ?

Last Updated: 23 July 2025

Analyzing and understanding salary distributions within departments is a critical aspect of human resource management. In this article, we will explore SQL queries to calc...read more

How to fix Cannot Insert Explicit Value For Identity Column in Table in SQL

Last Updated: 23 July 2025

In SQL, encountering the error message "Cannot insert explicit value for identity column in table 'table' when IDENTITY_INSERT is set to OFF" is a common challenge faced b...read more

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How to Execute a SQL Query with Named Parameters in JDBC?

Last Updated: 23 July 2025

Executing the SQL (Structured Query Language) query with named parameters in JDBC (Java Database Connectivity) is the fundamental feature of the database interaction in Ja...read more

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How to Split a Delimited String to Access Individual Items in SQL?

Last Updated: 23 July 2025

In SQL, dealing with delimited strings is a common task, especially when handling data that are not structured in a traditional tabular format. Whether it's parsing a list...read more

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How to Write Upsert in SQL?

Last Updated: 23 July 2025

In SQL, the "upsert" operation is a combination of "insert" and "update" operations. It allows you to add new rows if they do not exist in the table, or to replace existin...read more

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How to Declare a Variable in SQL?

Last Updated: 23 July 2025

Variables in SQL are fundamental for building efficient and scalable database applications. They enhance the flexibility and efficiency of database queries by acting as pl...read more

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How to SELECT DISTINCT on Multiple Columns in SQL?

Last Updated: 23 July 2025

Data duplication can lead to confusion, inefficiency and errors in reporting or analysis. One of the most useful SQL commands to avoid this issue is SELECT DISTINCT. It is...read more

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Maximizing Query Performance with COUNT(1) in SQL

Last Updated: 23 July 2025

In SQL, maximizing query performance is paramount for efficient database operations. The COUNT() function, particularly COUNT(1), proves pivotal in this endeavor. COUNT(1)...read more

How to Get the Identity of an Inserted Row in SQL

Last Updated: 23 July 2025

In databases, Sometimes we need the identity of an inserted row in SQL. The identity value of the newly inserted row is very useful for various purposes in the database. I...read more

How to Retrieve Data from Multiple Tables in SQL?

Last Updated: 23 July 2025

In SQL, retrieving data from multiple tables is a common requirement in database operations. Efficiently combining data from different tables allows developers to create c...read more

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How to Implement Relationships While Designing Tables in SQL?

Last Updated: 23 July 2025

In database design, understanding and implementing relationships between entities is crucial. These relationships, such as one-to-one, one-to-many, and many-to-many, estab...read more

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How to Escape a Single Quote in SQL ?

Last Updated: 23 July 2025

Structured Query Language (SQL) is an essential tool for manipulating relational databases in the growing field of data management. Whether we are a software developer, a ...read more

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