I can help with some of the issues you're facing.

Understanding Table Variables and OPENQUERY: A Comprehensive Guide for Efficient Query Execution on Remote Servers

Top 10 Listened England Musics: A Step-by-Step SQL INNER JOIN Guide

Using Window Functions to Select the Latest Date for Each ID Video Type

How to Filter Out Original Values While Displaying Searched-for Data in SQL Queries: A Practical Approach with Set-Based Exclusion

Joining Tables on Two Fields: A Deep Dive into SQL Joins and OR Clauses

Calculating Percentiles in Postgres: A Step-by-Step Guide

Understanding MySQL Aggregating Functions and GROUP BY Clauses: Mastering the Use of group_concat() in Queries

Converting DATE to DATETIME in Oracle: Best Practices and Alternatives

Using Aggregate Functions in the WHERE Clause of a SQL Query: Best Practices and Alternatives to HAVING