Jasen questions

Jasen answers

• how to calculate sum of numbers in a string in postgresql
• Changing type of primary key when you have foreign key constraint
• How would you track the history of all CRUD operations without re-architecting?
• Can I tail -f a log and only print certain lines matching some text?
• Return rows of a table that actually changed in an UPDATE
• Bash, array of where conditions, postgres select
• Guess the String given Random Triplets
• Realistic performance comparison of MySQL vs PostgreSQL
• Return pre-UPDATE column values using SQL only
• Fetching rows from a cursor PostgreSQL