wildplasser questions

wildplasser answers

• choose minimum date from a record out of multiple columns
• How to remove reverse duplicates from a SQL query
• Delete query on a very large table running extremely slowly SQL
• Why does using the "AND" operator works with a JOIN, even without a "WHERE" clause
• Lookups on known set of integer keys
• Name an output column created with case in PostgreSQL
• Creating C substrings: looping with assignment operator VS strncopy, which is better?
• Update PostgreSQL table with values from self
• Does mmap with MAP_NORESERVE reserve physical memory?
• Checking even or odd `1` bits in a number