EoinS questions

EoinS answers

• Selecting items on a matrix based on indexes given by an array
• sum over multiple columns
• SQLite subquery select statement
• What is the parameter keepdims in Keras' backend functions used for?
• MYSQL using AND in group by statement instead of commas
• yfinance not working - receiving json.decoder.JSONDecodeError
• use a string in SELECT clause on knex js (postgres)
• Double loop takes time
• Transact-SQL - number rows until condition met
• Function "TO_DATE" not found in H2 database