Update Org setup references, fix LaTeX key, normalize apostrophes & sed syntax

Improve section name

Update copyright range

Add null-safe SQL inequality examples using ISNULL for int and varchar

Disable code tangling by default and enable noweb in .sqshrc block

Add SQL snippets to compute total row count across all user tables

Refactor error output redirection and update copyright

Replace outdated SQL trigger listing queries with a detailed version

Add note on capitalizing system schema & metadata tables for SQL Server

Standardize copyright notices

Rename TODO.org

Add expression in the WHERE condition

Add section about "Checking existence (EXISTS) in Oracle trigger"

Add snippet

Improve "list views" snippet