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sql

Structured Query Language for database operations

ProgrammingPyMySQL Column Parameters: Why They Don't Work and Dynamic SQL Solutions

Learn why PyMySQL doesn't support column name parameters and discover secure approaches for dynamic column selection in SQL queries.

7 answers• 1 view
DatabasesPostgreSQL Case Insensitive Queries with ILIKE

Learn how to make PostgreSQL queries case-insensitive using ILIKE operator, LOWER/UPPER functions, citext extension, and indexing for optimal performance. Ensure 'administrator', 'ADMINISTRATOR', and 'Administrator' return identical results.

1 answer• 1 view
DatabasesMySQL INT(11): Storage Size in Bytes & Max Value

Discover the storage size of MySQL INT(11) column: always 4 bytes. Max signed value is 2,147,483,647; unsigned reaches 4,294,967,295. Learn why (11) doesn't affect storage or range, with official docs and best practices.

1 answer• 2 views
WebPHP PDO IN: Bind Arrays to SQL IN Clauses Safely

Discover how to bind arrays to PDO IN queries in PHP for secure php sql in operations. No built-in pdo in array binding—use dynamic placeholders, best practices, and code examples to avoid SQL injection in php pdo in clauses.

1 answer• 1 view
DatabasesCreate PostgreSQL Read-Only User with SELECT Permissions

Learn how to create a PostgreSQL read-only user with proper SELECT permissions on specific databases while restricting all other privileges for enhanced security.

1 answer• 1 view
ProgrammingSecure Parameter Passing in Gorm ORDER BY Clause

Learn how to securely pass parameters into Golang Gorm ORDER BY clauses using clause.Expr for custom ordering with array_position.

1 answer• 1 view
DatabasesUnderstanding MySQL Index Types: PRIMARY, UNIQUE, FULLTEXT

Learn the key differences between PRIMARY, UNIQUE, INDEX, and FULLTEXT index types in MySQL. Discover when to use each type for optimal database performance and design.

1 answer• 2 views
DatabasesOracle SQL: Get Max Date Row Per UserId (Latest Record)

Learn Oracle SQL techniques to fetch rows with maximum Date per UserId. Use ROW_NUMBER window function, JOIN subquery, NOT EXISTS, or KEEP DENSE_RANK for latest records efficiently on large tables.

1 answer• 1 view
DatabasesSQL Subquery Derived Table: Select All Sale Columns

Learn to use an SQL subquery as a derived table to select all columns from the Sale table for female customers (Gender='F'). Fix your query with INNER JOIN and DISTINCT for perfect results.

1 answer• 1 view
DatabasesFind SQL Duplicates by Email & Name: GROUP BY Guide

Learn to find and remove SQL duplicates by multiple fields like email and name using GROUP BY, HAVING, window functions. Examples for detecting, retrieving full rows, and safe deletion in MySQL, PostgreSQL, SQL Server.

1 answer• 5 views