Grouping by 200 Rows, Starting with Newest ID

Optimizing SQL WHERE Clauses for Multiple Wildcards

Passing Table-Valued Parameters with ExecuteStoreQuery: A Powerful Feature in SQL Server

Merging Data from Two Tables Using SQL GROUP BY, MAX, and CASE Statements to Replace Null Values in a Pivot Table.

The Benefits and Drawbacks of Caching Large Records in Applications: A Nuanced Issue

Using Google Charts to Create Pie Charts from SQL Data: A Step-by-Step Guide

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

Mastering SQL HAVING COUNT: Filtering Groups for More Accurate Insights

Updating Row by Row Values in a PL/SQL Table: A Comprehensive Guide Using Cursors

Resolving HSQLDB Integrity Constraint Violations with the MERGE Statement