Paul Maxwell questions

Paul Maxwell answers

• MySQL Sum values by date, compare this year to last year
• Complex MySQL sort
• Impala SQL build columns based on row data and populating columns with additional row data
• Mysql query select every user per date latest record
• Oracle - SQL to concatenate multiple rows [duplicate]
• Knex.js : How to select columns from multiple tables?
• Using string_split to create rows from multiple columns
• 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