Paul Maxwell questions

Paul Maxwell answers

• Why does WHERE clause removes null values from the result?
• How to return two values from PostgreSQL subquery?
• postgresql - Change single row to multiple rows
• How to combine rows in Amazon Redshift [duplicate]
• SQL "between" not inclusive
• Redshift PostgreSQL Distinct ON Operator
• SQL Server JSON_VALUE syntax
• SELECT sub-query with WHERE condition in Yii2 find() / QueryBuilder
• what does this mean "order by NULL"
• MySql IN clauses, trying to match IN list of tuples