Jasen questions

Jasen answers

• 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
• Double curly braces in bash - bad substitution
• How to compare two tables in Postgresql?
• What is the symbol of the `mux` chip in C?