MySQL system-functions summary

Dirty Summary for mysql system functions, mainly for dba or pen tester:

• found_rows() - returns the current table row numbers
• last_insert_id() - for auto_increment para, this is somehow helpful
  
• user() - this is extremely useful,it returns the current username (e.g:root ->then you can smile ^^)
  
• database() - this is cool too, gives back the current database name, ease the pain of spending hours on finding it.
• version() - This is awesome, you all know mysql 3,4,5 are different and have some unique features.Without knowing the version, you might stuck for another hours
  
• connection_id() - Well, you can guess how busy this database is
• INET_ATON(ip) - Not really useful for pentesting
  

And some password functions,

• password($pwd) - encrypts a specified string as a 41-byte hash value, it is pretty weak alogrithm
• md5($pwd) - MD5 encryption, possibly crackable
  

• sha($pwd) - sha encryption, possibly crackable (sha1-version, which means you can use sha1($pwd) for getting the same result

Might not completed...correct me!